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Taking the data mapper approach in Zend Framework

- by Seeker

Let's assume the following tables setup for a Zend Framework app. user (id) groups (id) groups_users (id, user_id, group_id, join_date) I took the Data Mapper approach to models which basically gives me: Model_User, Model_UsersMapper, Model_DbTable_Users Model_Group, Model_GroupsMapper, Model_DbTable_Groups Model_GroupUser, Model_GroupsUsersMapper, Model_DbTable_GroupsUsers (for holding the relationships which can be seen as aentities; notice the "join_date" property) I'm defining the _referenceMap in Model_DbTable_GroupsUsers: protected $_referenceMap = array ( 'User' => array ( 'columns' => array('user_id'), 'refTableClass' => 'Model_DbTable_Users', 'refColumns' => array('id') ), 'App' => array ( 'columns' => array('group_id'), 'refTableClass' => 'Model_DbTable_Groups', 'refColumns' => array('id') ) ); I'm having these design problems in mind: 1) The Model_Group only mirrors the fields in the groups table. How can I return a collection of groups a user is a member of and also the date the user joined that group for every group? If I just added the property to the domain object, then I'd have to let the group mapper know about it, wouldn't I? 2) Let's say I need to fetch the groups a user belongs to. Where should I put this logic? Model_UsersMapper or Model_GroupsUsersMapper? I also want to make use of the referencing map (dependent tables) mechanism and probably use findManyToManyRowset or findDependentRowset, something like: $result = $this->getDbTable()->find($userId); $row = $result->current(); $groups = $row->findManyToManyRowset( 'Model_DbTable_Groups', 'Model_DbTable_GroupsUsers' ); This would produce two queries when I could have just written it in a single query. I will place this in the Model_GroupsUsersMapper class. An enhancement would be to add a getGroups method to the Model_User domain object which lazily loads the groups when needed by calling the appropriate method in the data mapper, which begs for the second question. Should I allow the domain object know about the data mapper?

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ai: Determining what tests to run to get most useful data

- by Sai Emrys

This is for http://cssfingerprint.com I have a system (see about page on site for details) where: I need to output a ranked list, with confidences, of categories that match a particular feature vector the binary feature vectors are a list of site IDs & whether this session detected a hit feature vectors are, for a given categorization, somewhat noisy (sites will decay out of history, and people will visit sites they don't normally visit) categories are a large, non-closed set (user IDs) my total feature space is approximately 50 million items (URLs) for any given test, I can only query approx. 0.2% of that space I can only make the decision of what to query, based on results so far, ~10-30 times, and must do so in <~100ms (though I can take much longer to do post-processing, relevant aggregation, etc) getting the AI's probability ranking of categories based on results so far is mildly expensive; ideally the decision will depend mostly on a few cheap sql queries I have training data that can say authoritatively that any two feature vectors are the same category but not that they are different (people sometimes forget their codes and use new ones, thereby making a new user id) I need an algorithm to determine what features (sites) are most likely to have a high ROI to query (i.e. to better discriminate between plausible-so-far categories [users], and to increase certainty that it's any given one). This needs to take into balance exploitation (test based on prior test data) and exploration (test stuff that's not been tested enough to find out how it performs). There's another question that deals with a priori ranking; this one is specifically about a posteriori ranking based on results gathered so far. Right now, I have little enough data that I can just always test everything that anyone else has ever gotten a hit for, but eventually that won't be the case, at which point this problem will need to be solved. I imagine that this is a fairly standard problem in AI - having a cheap heuristic for what expensive queries to make - but it wasn't covered in my AI class, so I don't actually know whether there's a standard answer. So, relevant reading that's not too math-heavy would be helpful, as well as suggestions for particular algorithms. What's a good way to approach this problem?

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Cocoa Core data: cannot save Created Items in NSTableview

- by Paul Rostorp

Hello, I'm am a beginner in mac os x development and am trying to get started with all this. Here is my problem : I've create a non-document based cocoa app using core data as storage. I've added an entity and attributes to the xdatamodel. In IB i've created an NSArrayController and linked it properly. I've created an nstableview binded to the nsarraycontroller. Next I added a button linked to nsarraycontroller with the " add: " method. When I try it out, I can add and edit the items in the table. Here comes the problem: Core data is supposed to save everything automatically, but to make sure i linked the "save" button in the menu to the appdelegate and to the " file's owner" , first responder, application... everything possible ( with both " save :" and " saveaction:" methods ). And still it doesn't save when clicking save: when I restart the cell created ( and renamed ) are gone. And also, I didn't even edit the source code yet; core data for such simple tasks is supposed to only need Interface builder. Please help me for this, I haven't found any threads resolving this problem. Thank you in advance.

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SPARC T5-4 LDoms for RAC and WebLogic Clusters

- by Jeff Taylor-Oracle

I wanted to use two Oracle SPARC T5-4 servers to simultaneously host both Oracle RAC and a WebLogic Server Cluster. I chose to use Oracle VM Server for SPARC to create a cluster like this: There are plenty of trade offs and decisions that need to be made, for example: Rather than configuring the system by hand, you might want to use an Oracle SuperCluster T5-8 My configuration is similar to jsavit's: Availability Best Practices - Example configuring a T5-8 but I chose to ignore some of the advice. Maybe I should have included an alternate service domain, but I decided that I already had enough redundancy Both Oracle SPARC T5-4 servers were to be configured like this: Cntl 0.25 4 64GB App LDom 2.75 CPU's 44 cores 704 GB DB LDom One CPU 16 cores 256 GB The systems started with everything in the primary domain: # ldm list NAME STATE FLAGS CONS VCPU MEMORY UTIL NORM UPTIME primary active -n-c-- UART 512 1023G 0.0% 0.0% 11m # ldm list-spconfig factory-default [current] primary # ldm list -o core,memory,physio NAME primary CORE CID CPUSET 0 (0, 1, 2, 3, 4, 5, 6, 7) 1 (8, 9, 10, 11, 12, 13, 14, 15) 2 (16, 17, 18, 19, 20, 21, 22, 23) -- SNIP 62 (496, 497, 498, 499, 500, 501, 502, 503) 63 (504, 505, 506, 507, 508, 509, 510, 511) MEMORY RA PA SIZE 0x30000000 0x30000000 255G 0x80000000000 0x80000000000 256G 0x100000000000 0x100000000000 256G 0x180000000000 0x180000000000 256G # Give this memory block to the DB LDom IO DEVICE PSEUDONYM OPTIONS pci@300 pci_0 pci@340 pci_1 pci@380 pci_2 pci@3c0 pci_3 pci@400 pci_4 pci@440 pci_5 pci@480 pci_6 pci@4c0 pci_7 pci@300/pci@1/pci@0/pci@6 /SYS/RCSA/PCIE1 pci@300/pci@1/pci@0/pci@c /SYS/RCSA/PCIE2 pci@300/pci@1/pci@0/pci@4/pci@0/pci@c /SYS/MB/SASHBA0 pci@300/pci@1/pci@0/pci@4/pci@0/pci@8 /SYS/RIO/NET0 pci@340/pci@1/pci@0/pci@6 /SYS/RCSA/PCIE3 pci@340/pci@1/pci@0/pci@c /SYS/RCSA/PCIE4 pci@380/pci@1/pci@0/pci@a /SYS/RCSA/PCIE9 pci@380/pci@1/pci@0/pci@4 /SYS/RCSA/PCIE10 pci@3c0/pci@1/pci@0/pci@e /SYS/RCSA/PCIE11 pci@3c0/pci@1/pci@0/pci@8 /SYS/RCSA/PCIE12 pci@400/pci@1/pci@0/pci@e /SYS/RCSA/PCIE5 pci@400/pci@1/pci@0/pci@8 /SYS/RCSA/PCIE6 pci@440/pci@1/pci@0/pci@e /SYS/RCSA/PCIE7 pci@440/pci@1/pci@0/pci@8 /SYS/RCSA/PCIE8 pci@480/pci@1/pci@0/pci@a /SYS/RCSA/PCIE13 pci@480/pci@1/pci@0/pci@4 /SYS/RCSA/PCIE14 pci@4c0/pci@1/pci@0/pci@8 /SYS/RCSA/PCIE15 pci@4c0/pci@1/pci@0/pci@4 /SYS/RCSA/PCIE16 pci@4c0/pci@1/pci@0/pci@c/pci@0/pci@c /SYS/MB/SASHBA1 pci@4c0/pci@1/pci@0/pci@c/pci@0/pci@4 /SYS/RIO/NET2 Added an additional service processor configuration: # ldm add-spconfig split # ldm list-spconfig factory-default primary split [current] And removed many of the resources from the primary domain: # ldm start-reconf primary # ldm set-core 4 primary # ldm set-memory 32G primary # ldm rm-io pci@340 primary # ldm rm-io pci@380 primary # ldm rm-io pci@3c0 primary # ldm rm-io pci@400 primary # ldm rm-io pci@440 primary # ldm rm-io pci@480 primary # ldm rm-io pci@4c0 primary # init 6 Needed to add resources to the guest domains: # ldm add-domain db # ldm set-core cid=`seq -s"," 48 63` db # ldm add-memory mblock=0x180000000000:256G db # ldm add-io pci@480 db # ldm add-io pci@4c0 db # ldm add-domain app # ldm set-core 44 app # ldm set-memory 704G app # ldm add-io pci@340 app # ldm add-io pci@380 app # ldm add-io pci@3c0 app # ldm add-io pci@400 app # ldm add-io pci@440 app Needed to set up services: # ldm add-vds primary-vds0 primary # ldm add-vcc port-range=5000-5100 primary-vcc0 primary Needed to add a virtual network port for the WebLogic application domain: # ipadm NAME CLASS/TYPE STATE UNDER ADDR lo0 loopback ok -- -- lo0/v4 static ok -- ... lo0/v6 static ok -- ... net0 ip ok -- ... net0/v4 static ok -- xxx.xxx.xxx.xxx/24 net0/v6 addrconf ok -- .... net0/v6 addrconf ok -- ... net8 ip ok -- -- net8/v4 static ok -- ... # dladm show-phys LINK MEDIA STATE SPEED DUPLEX DEVICE net1 Ethernet unknown 0 unknown ixgbe1 net0 Ethernet up 1000 full ixgbe0 net8 Ethernet up 10 full usbecm2 # ldm add-vsw net-dev=net0 primary-vsw0 primary # ldm add-vnet vnet1 primary-vsw0 app Needed to add a virtual disk to the WebLogic application domain: # format Searching for disks...done AVAILABLE DISK SELECTIONS: 0. c0t5000CCA02505F874d0 <HITACHI-H106060SDSUN600G-A2B0-558.91GB> /scsi_vhci/disk@g5000cca02505f874 /dev/chassis/SPARC_T5-4.AK00084038/SYS/SASBP0/HDD0/disk 1. c0t5000CCA02506C468d0 <HITACHI-H106060SDSUN600G-A2B0-558.91GB> /scsi_vhci/disk@g5000cca02506c468 /dev/chassis/SPARC_T5-4.AK00084038/SYS/SASBP0/HDD1/disk 2. c0t5000CCA025067E5Cd0 <HITACHI-H106060SDSUN600G-A2B0-558.91GB> /scsi_vhci/disk@g5000cca025067e5c /dev/chassis/SPARC_T5-4.AK00084038/SYS/SASBP0/HDD2/disk 3. c0t5000CCA02506C258d0 <HITACHI-H106060SDSUN600G-A2B0-558.91GB> /scsi_vhci/disk@g5000cca02506c258 /dev/chassis/SPARC_T5-4.AK00084038/SYS/SASBP0/HDD3/disk Specify disk (enter its number): ^C # ldm add-vdsdev /dev/dsk/c0t5000CCA02506C468d0s2 HDD1@primary-vds0 # ldm add-vdisk HDD1 HDD1@primary-vds0 app Add some additional spice to the pot: # ldm set-variable auto-boot\\?=false db # ldm set-variable auto-boot\\?=false app # ldm set-var boot-device=HDD1 app Bind the logical domains: # ldm bind db # ldm bind app At the end of the process, the system is set up like this: # ldm list -o core,memory,physio NAME primary CORE CID CPUSET 0 (0, 1, 2, 3, 4, 5, 6, 7) 1 (8, 9, 10, 11, 12, 13, 14, 15) 2 (16, 17, 18, 19, 20, 21, 22, 23) 3 (24, 25, 26, 27, 28, 29, 30, 31) MEMORY RA PA SIZE 0x30000000 0x30000000 32G IO DEVICE PSEUDONYM OPTIONS pci@300 pci_0 pci@300/pci@1/pci@0/pci@6 /SYS/RCSA/PCIE1 pci@300/pci@1/pci@0/pci@c /SYS/RCSA/PCIE2 pci@300/pci@1/pci@0/pci@4/pci@0/pci@c /SYS/MB/SASHBA0 pci@300/pci@1/pci@0/pci@4/pci@0/pci@8 /SYS/RIO/NET0 ------------------------------------------------------------------------------ NAME app CORE CID CPUSET 4 (32, 33, 34, 35, 36, 37, 38, 39) 5 (40, 41, 42, 43, 44, 45, 46, 47) 6 (48, 49, 50, 51, 52, 53, 54, 55) 7 (56, 57, 58, 59, 60, 61, 62, 63) 8 (64, 65, 66, 67, 68, 69, 70, 71) 9 (72, 73, 74, 75, 76, 77, 78, 79) 10 (80, 81, 82, 83, 84, 85, 86, 87) 11 (88, 89, 90, 91, 92, 93, 94, 95) 12 (96, 97, 98, 99, 100, 101, 102, 103) 13 (104, 105, 106, 107, 108, 109, 110, 111) 14 (112, 113, 114, 115, 116, 117, 118, 119) 15 (120, 121, 122, 123, 124, 125, 126, 127) 16 (128, 129, 130, 131, 132, 133, 134, 135) 17 (136, 137, 138, 139, 140, 141, 142, 143) 18 (144, 145, 146, 147, 148, 149, 150, 151) 19 (152, 153, 154, 155, 156, 157, 158, 159) 20 (160, 161, 162, 163, 164, 165, 166, 167) 21 (168, 169, 170, 171, 172, 173, 174, 175) 22 (176, 177, 178, 179, 180, 181, 182, 183) 23 (184, 185, 186, 187, 188, 189, 190, 191) 24 (192, 193, 194, 195, 196, 197, 198, 199) 25 (200, 201, 202, 203, 204, 205, 206, 207) 26 (208, 209, 210, 211, 212, 213, 214, 215) 27 (216, 217, 218, 219, 220, 221, 222, 223) 28 (224, 225, 226, 227, 228, 229, 230, 231) 29 (232, 233, 234, 235, 236, 237, 238, 239) 30 (240, 241, 242, 243, 244, 245, 246, 247) 31 (248, 249, 250, 251, 252, 253, 254, 255) 32 (256, 257, 258, 259, 260, 261, 262, 263) 33 (264, 265, 266, 267, 268, 269, 270, 271) 34 (272, 273, 274, 275, 276, 277, 278, 279) 35 (280, 281, 282, 283, 284, 285, 286, 287) 36 (288, 289, 290, 291, 292, 293, 294, 295) 37 (296, 297, 298, 299, 300, 301, 302, 303) 38 (304, 305, 306, 307, 308, 309, 310, 311) 39 (312, 313, 314, 315, 316, 317, 318, 319) 40 (320, 321, 322, 323, 324, 325, 326, 327) 41 (328, 329, 330, 331, 332, 333, 334, 335) 42 (336, 337, 338, 339, 340, 341, 342, 343) 43 (344, 345, 346, 347, 348, 349, 350, 351) 44 (352, 353, 354, 355, 356, 357, 358, 359) 45 (360, 361, 362, 363, 364, 365, 366, 367) 46 (368, 369, 370, 371, 372, 373, 374, 375) 47 (376, 377, 378, 379, 380, 381, 382, 383) MEMORY RA PA SIZE 0x30000000 0x830000000 192G 0x4000000000 0x80000000000 256G 0x8080000000 0x100000000000 256G IO DEVICE PSEUDONYM OPTIONS pci@340 pci_1 pci@380 pci_2 pci@3c0 pci_3 pci@400 pci_4 pci@440 pci_5 pci@340/pci@1/pci@0/pci@6 /SYS/RCSA/PCIE3 pci@340/pci@1/pci@0/pci@c /SYS/RCSA/PCIE4 pci@380/pci@1/pci@0/pci@a /SYS/RCSA/PCIE9 pci@380/pci@1/pci@0/pci@4 /SYS/RCSA/PCIE10 pci@3c0/pci@1/pci@0/pci@e /SYS/RCSA/PCIE11 pci@3c0/pci@1/pci@0/pci@8 /SYS/RCSA/PCIE12 pci@400/pci@1/pci@0/pci@e /SYS/RCSA/PCIE5 pci@400/pci@1/pci@0/pci@8 /SYS/RCSA/PCIE6 pci@440/pci@1/pci@0/pci@e /SYS/RCSA/PCIE7 pci@440/pci@1/pci@0/pci@8 /SYS/RCSA/PCIE8 ------------------------------------------------------------------------------ NAME db CORE CID CPUSET 48 (384, 385, 386, 387, 388, 389, 390, 391) 49 (392, 393, 394, 395, 396, 397, 398, 399) 50 (400, 401, 402, 403, 404, 405, 406, 407) 51 (408, 409, 410, 411, 412, 413, 414, 415) 52 (416, 417, 418, 419, 420, 421, 422, 423) 53 (424, 425, 426, 427, 428, 429, 430, 431) 54 (432, 433, 434, 435, 436, 437, 438, 439) 55 (440, 441, 442, 443, 444, 445, 446, 447) 56 (448, 449, 450, 451, 452, 453, 454, 455) 57 (456, 457, 458, 459, 460, 461, 462, 463) 58 (464, 465, 466, 467, 468, 469, 470, 471) 59 (472, 473, 474, 475, 476, 477, 478, 479) 60 (480, 481, 482, 483, 484, 485, 486, 487) 61 (488, 489, 490, 491, 492, 493, 494, 495) 62 (496, 497, 498, 499, 500, 501, 502, 503) 63 (504, 505, 506, 507, 508, 509, 510, 511) MEMORY RA PA SIZE 0x80000000 0x180000000000 256G IO DEVICE PSEUDONYM OPTIONS pci@480 pci_6 pci@4c0 pci_7 pci@480/pci@1/pci@0/pci@a /SYS/RCSA/PCIE13 pci@480/pci@1/pci@0/pci@4 /SYS/RCSA/PCIE14 pci@4c0/pci@1/pci@0/pci@8 /SYS/RCSA/PCIE15 pci@4c0/pci@1/pci@0/pci@4 /SYS/RCSA/PCIE16 pci@4c0/pci@1/pci@0/pci@c/pci@0/pci@c /SYS/MB/SASHBA1 pci@4c0/pci@1/pci@0/pci@c/pci@0/pci@4 /SYS/RIO/NET2 Start the domains: # ldm start app LDom app started # ldm start db LDom db started Make sure to start the vntsd service that was created, above. # svcs -a | grep ldo disabled 8:38:38 svc:/ldoms/vntsd:default online 8:38:58 svc:/ldoms/agents:default online 8:39:25 svc:/ldoms/ldmd:default # svcadm enable vntsd Now use the MAC address to configure the Solaris 11 Automated Installation. Database Logical Domain # telnet localhost 5000 {0} ok devalias screen /pci@4c0/pci@1/pci@0/pci@c/pci@0/pci@7/display@0 disk7 /pci@4c0/pci@1/pci@0/pci@c/pci@0/pci@c/scsi@0/disk@p3 disk6 /pci@4c0/pci@1/pci@0/pci@c/pci@0/pci@c/scsi@0/disk@p2 disk5 /pci@4c0/pci@1/pci@0/pci@c/pci@0/pci@c/scsi@0/disk@p1 disk4 /pci@4c0/pci@1/pci@0/pci@c/pci@0/pci@c/scsi@0/disk@p0 scsi1 /pci@4c0/pci@1/pci@0/pci@c/pci@0/pci@c/scsi@0 net3 /pci@4c0/pci@1/pci@0/pci@c/pci@0/pci@4/network@0,1 net2 /pci@4c0/pci@1/pci@0/pci@c/pci@0/pci@4/network@0 virtual-console /virtual-devices/console@1 name aliases {0} ok boot net2 Boot device: /pci@4c0/pci@1/pci@0/pci@c/pci@0/pci@4/network@0 File and args: 1000 Mbps full duplex Link up Requesting Internet Address for xx:xx:xx:xx:xx:xx Requesting Internet Address for xx:xx:xx:xx:xx:xx WLS Logical Domain # telnet localhost 5001 {0} ok devalias hdd1 /virtual-devices@100/channel-devices@200/disk@0 vnet1 /virtual-devices@100/channel-devices@200/network@0 net /virtual-devices@100/channel-devices@200/network@0 disk /virtual-devices@100/channel-devices@200/disk@0 virtual-console /virtual-devices/console@1 name aliases {0} ok boot net Boot device: /virtual-devices@100/channel-devices@200/network@0 File and args: Requesting Internet Address for xx:xx:xx:xx:xx:xx Requesting Internet Address for xx:xx:xx:xx:xx:xx Repeat the process for the second SPARC T5-4, install Solaris, RAC and WebLogic Cluster, and you are ready to go. Maybe buying a SuperCluster would have been easier.

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DjangoUnicodeDecodeError while storing pickle'd data.

- by Jack M.

I've got a simple dict object I'm trying to store in the database after it has been run through pickle. It seems that Django doesn't like trying to encode this error. I've checked with MySQL, and the query isn't even getting there before it is throwing the error, so I don't believe that is the problem. The dict I'm storing looks like this: { 'ordered': [ { 'value': u'First\xd1ame Last\xd1ame', 'label': u'Full Name' }, { 'value': u'123-456-7890', 'label': u'Phone Number' }, { 'value': u'[email protected]', 'label': u'Email Address' } ], 'cleaned_data': { u'Phone Number': u'123-456-7890', u'Full Name': u'First\xd1ame Last\xd1ame', u'Email Address': u'[email protected]' }, 'post_data': <QueryDict: { u'Phone Number': [u'1234567890'], u'Full Name_1': [u'Last\xd1ame'], u'Full Name_0': [u'First\xd1ame'], u'Email Address': [u'[email protected]'] }>, 'user': <User: itis> } The error that gets thrown is: 'utf8' codec can't decode bytes in position 52-53: invalid data. Position 52-53 is the first instance of \xd1 (Ñ) in the pickled data. So far, I've dug around StackOverflow and found a few questions where the database encoding for the objects was wrong. This doesn't help me because there is no MySQL query yet. This is happening before the database. Google also didn't help much when searching for unicode errors on pickled data. It is probably worth mentioning that if I don't use the Ñ, this code works fine.

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Which persistent & lightweight queue messaging for cross domain (> 2) data exchange with rails integ

- by Erwan

Hi all, I'm looking for the right messaging system for my needs. Can you help me ? For now, there won't be a huge amount of data to process, but I don't want to be limited later ... The machines are not just web servers, so the messaging tool should be lightweight, even if processing is not very speed. When some data change on a server, all servers should have the information and process it locally. (should I create one channel per server on each of them ?) The frontend is written on Rails, so it is important, in order to simplify the development, that there is a gem / plugin to manage communications and data sent. At this time : RabbitMQ + workling seems to fit my needs. Could this be a right choice ? ActiveMQ make me afraid, because of Java (I really don't know very well Java, but it seems to me to be big CPU consumer) Others don't seem to be as mature as them. There might be lot of development using this kind of technology, so I can't go to the wrong way ! Thank you for help.

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Solving problems involving more complex data structures with CUDA

- by Nils

So I read a bit about CUDA and GPU programming. I noticed a few things such that access to global memory is slow (therefore shared memory should be used) and that the execution path of threads in a warp should not diverge. I also looked at the (dense) matrix multiplication example, described in the programmers manual and the nbody problem. And the trick with the implementation seems to be the same: Arrange the calculation in a grid (which it already is in case of the matrix mul); then subdivide the grid into smaller tiles; fetch the tiles into shared memory and let the threads calculate as long as possible, until it needs to reload data from the global memory into shared memory. In case of the nbody problem the calculation for each body-body interaction is exactly the same (page 682): bodyBodyInteraction(float4 bi, float4 bj, float3 ai) It takes two bodies and an acceleration vectors. The body vector has four components it's position and the weight. When reading the paper, the calculation is understood easily. But what is if we have a more complex object, with a dynamic data structure? For now just assume that we have an object (similar to the body object presented in the paper) which has a list of other objects attached and the number of objects attached is different in each thread. How could I implement that without having the execution paths of the threads to diverge? I'm also looking for literature which explains how different algorithms involving more complex data structures can be effectively implemented in CUDA.

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How Does MVC Handle Missing Data Requirements

- by Don Bakke

I'm teaching myself MVC concepts in hopes of applying them to a non-OO/procedural development environment. I am pretty sure I understand simple View - Request - Controller - Request - Model - Response - Controller - Response - View flow. What I am struggling with is understanding more complex scenarios. For instance, let's say I have a shopping cart form with a button for 'Calculate Shipping'. Normally a click on this button will follow the above flow. But what if there is missing data, like the zip code? Should the View verify this first and alert the user before making a 'Calculate Shipping' request? Or should the request be made and the Model returns a notification that critical data is missing? If the latter, does the Controller instruct the View to alert the user? What if I wanted to prompt the user for the missing zip code (perhaps in a popup input display) and then automatically request the 'Calculate Shipping' method again? I suppose this gets into the question of how smart a View ought to be. It seems that MVC has evolved due to richer UI and automation (such as with data-binding) and this muddies the water from a purist MVC perspective. Any thoughts are greatly appreciated.

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Exporting data from php page to word document

- by udaya

Hi I exported data from php page to word document but the problm is the header is not available in all pages I got the same problem while i am exporting the datas to pdf but i got the result for that one by using fpdf library In pdf i got the results like this ex page1 slno name 1 udaya 2 sankar In page 2 slno name 3 chendu 4 Akila I want the same kind of result in word how to get that This is the function i used function changeDetails() { $bType = $this-input-post('textvalue'); if($bType == "word") { $this-load-library('table'); $data['countrytoword'] = $this-AddEditmodel1-export(); $this-table-set_heading('Name','Country','State','Town'); $out = $this-table-generate($data['countrytoword']); header("Content-Type: application/vnd.ms-word"); header("Expires: 0"); header("Cache-Control: must-revalidate, post-check=0, pre-check=0"); header("Content-disposition: attachment; filename=$cur_date.doc"); echo ''; echo 'CountryList'; print_r($out); } } Name Country State Town

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How do I copy or move an NSManagedObject from one context to another?

- by Aeonaut

I have what I assume is a fairly standard setup, with one scratchpad MOC which is never saved (containing a bunch of objects downloaded from the web) and another permanent MOC which persists objects. When the user selects an object from scratchMOC to add to her library, I want to either 1) remove the object from scratchMOC and insert into permanentMOC, or 2) copy the object into permanentMOC. The Core Data FAQ says I can copy an object like this: NSManagedObjectID *objectID = [managedObject objectID]; NSManagedObject *copy = [context2 objectWithID:objectID]; (In this case, context2 would be permanentMOC.) However, when I do this, the copied object is faulted; the data is initially unresolved. When it does get resolved, later, all of the values are nil; none of the data (attributes or relationships) from the original managedObject are actually copied or referenced. Therefore I can't see any difference between using this objectWithID: method and just inserting an entirely new object into permanentMOC using insertNewObjectForEntityForName:. I realize I can create a new object in permanentMOC and manually copy each key-value pair from the old object, but I'm not very happy with that solution. (I have a number of different managed objects for which I have this problem, so I don't want to have to write and update copy: methods for all of them as I continue developing.) Is there a better way?

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What is the correct way to implement a massive hierarchical, geographical search for news?

- by Philip Brocoum

The company I work for is in the business of sending press releases. We want to make it possible for interested parties to search for press releases based on a number of criteria, the most important being location. For example, someone might search for all news sent to New York City, Massachusetts, or ZIP code 89134, sent from a governmental institution, under the topic of "traffic". Or whatever. The problem is, we've sent, literally, hundreds of thousands of press releases. Searching is slow and complex. For example, a press release sent to Queens, NY should show up in the search I mentioned above even though it wasn't specifically sent to New York City, because Queens is a subset of New York City. We may also want to implement "and" and "or" and negation and text search to the query to create complex searches. These searches also have to be fast enough to function as dynamic RSS feeds. I really don't know anything about search theory, or how it's properly done. The way we are getting by right now is using a data mart to store the locations the releases were sent to in a single table. However, because of the subset thing mentioned above, the data mart is gigantic with millions of rows. And we haven't even implemented cities yet, and there are about 50,000 cities in the United States, which will exponentially increase the size of the data mart by so much I'm afraid it just won't work anymore. Anyway, I realize this is not a simple question and there won't be a "do this" answer. However, I'm hoping one of you can point me in the right direction where I can learn about how massive searches are done? Because I really know nothing about it. And such a search engine is turning out to be incredibly difficult to make. Thanks! I know there must be a way because if Google can search the entire internet we must be able to search our own database :-)

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Binding data to the custom DataGridView

- by Jatin Chaturvedi

All, I have a customized DataGridView where I have implemented extra functionality and bounded datasource in the same custom DataGridView (Using C# and .NET). Now, I could able to use it properly by placing it on a panel control. I have added label as button on panel control to display data from datasource on to datagrid and create a binding source. Another Label which act as a button is used to update data from grid to databse. Issue: I pressed show label to display data in a dsatagridview. Modified the grid cell value and immediately pressed update label which is on same panel control. I observed that, the cursor is still in the grid cell when I press Save button. While saving, the cell value is null even though I have entered something in the presentation layer. My expected behaviour is to get the modified value while saving. Special Case: After typing something in the grid cell, if I click on somewhere else like the row below where I entered something, before I click on Save button, it is working fine. (Here, mainly I tried to remove the focus from the currently modified cell) Is there any way to bind sources before I click on save button? Please suggest me. Please feel free to ask me if you need any information. I have also seen same kind of problem on this forum, but unfortunately the author got the answer and didnt post it back. here is that URL: http://social.msdn.microsoft.com/Forums/en/winformsdesigner/thread/54dcc87a-adc2-4965-b306-9aa9e79c2946 Please help me.

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Reading Serial Data From C (OSX /dev/tty)

- by Jud Stephenson

I am trying to read data from a bluetooth barcode scanner (KDC300) using C. Here is the code I have so far, and the program successfully establishes a bluetooth connection to the scanner, but when a barcode is scanned, no input is displayed on the screen (Eventually more will be done with the data, but we have to get it working first, right). Here is the program: #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <fcntl.h> #include <errno.h> #include <termios.h> #include <sys/ioctl.h> int main (int argc, const char * argv[]) { // define vars int STOP = 0; //char buf[255]; if(argv[1]) { int fd = open("/dev/tty.KDC1", O_RDONLY); if(fd == -1) { printf("%s", strcat("Unable to open /dev/tty.", argv[1])); } int res; while(STOP == 0) { while((res = read(fd,buf,255)) == 0); { if(res > 0) { buf[res]=0; printf("%s:%d\n", buf, res); if(buf[sizeof(buf)]=='\n') break; } } } } return 0; } If anyone has any ideas, I am at a loss on this so far. If it is any help, I can run screen /dev/tty.KDC1 and any barcodes scanned on the scanner appear in the terminal, I just can't do anything with the data. Jud

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Visual Studio Designer looses / ignores data

- by Kempeth

I'm writing my own control - a datagridviewcolumn that displays integer values as texts like the comboboxcolumn can but without showing the combobox unless the cell is edited. I'm mostly there but I have problems with the databinding. I managed to get the necessary properties to appear in the designer but every time I set the datasource and close the editor the changes are dropped. When I assign the same datasource later in code it works like a charm, I just would prefer not having to do that... public class DataGridViewLookupColumn : DataGridViewColumn { private DataGridViewLookupCell template; private Object datasource = null; private String displaymember = String.Empty; private String valuemember = String.Empty; private BindingSource bindingsource = new BindingSource(); public DataGridViewLookupColumn() : base() { this.template = new DataGridViewLookupCell(); } public override DataGridViewCell CellTemplate { get { return this.template; } set { } } [Category("Data")] [ DefaultValue(null), RefreshProperties(RefreshProperties.Repaint), AttributeProvider(typeof(IListSource)), DesignerSerializationVisibility(DesignerSerializationVisibility.Visible), ] public object DataSource { get { return this.bindingsource.DataSource; //return this.datasource; } set { this.bindingsource.DataSource = value; this.bindingsource.EndEdit(); } } [Category("Data")] [ DefaultValue(""), TypeConverterAttribute("System.Windows.Forms.Design.DataMemberFieldConverter, System.Design"), Editor("System.Windows.Forms.Design.DataMemberFieldEditor, System.Design", typeof(System.Drawing.Design.UITypeEditor)), DesignerSerializationVisibility(DesignerSerializationVisibility.Visible), ] public String DisplayMember { get { return this.displaymember; } set { this.displaymember = value; } } [Category("Data")] [ DefaultValue(""), TypeConverterAttribute("System.Windows.Forms.Design.DataMemberFieldConverter, System.Design"), Editor("System.Windows.Forms.Design.DataMemberFieldEditor, System.Design", typeof(System.Drawing.Design.UITypeEditor)), DesignerSerializationVisibility(DesignerSerializationVisibility.Visible), ] public String ValueMember { get { return this.valuemember; } set { this.valuemember = value; } } } EDIT: I experimenting I just found out that that original DataGridViewComboBoxColumn can be made to behave exactly like I wanted to. By setting the DisplayStyle to Nothing the combobox control is only shown in edit mode.

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Unit test with live data

- by Kurresmack

Hey, I have googled this a little and didn't really find the answer I needed. I am working on a webpage in C# with MSSQL and LINQ for a customer. I want the users to be able to send messages to each other. So what I do is that I unit test this with live data. The problem is that I now depend on having at least 2 users who I know the ID of. Furthermore I have to clean up after my self. This leads to rather large unit tests that test alot in one test. Lets say I would like to update a user. That would mean that I would have to ceate the user, update it, and then delete it. This a lot of assertions in one unit test and if it fails with updating i have to manually delete it. If I would do it any other way, without live data, I would not fore sure be able to know that the data was present in the database after updating etc. What is the proper way to do this without having a test that tests a lot of functuality by it self?

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JSP Precompilation for ADF Applications

- by Duncan Mills

A question that comes up from time to time, particularly in relation to build automation, is how to best pre-compile the .jspx and .jsff files in an ADF application. Thus ensuring that the app is ready to run as soon as it's installed into WebLogic. In the normal run of things, the first poor soul to hit a page pays the price and has to wait a little whilst the JSP is compiled into a servlet. Everyone else subsequently gets a free lunch. So it's a reasonable thing to want to do... Let Me List the Ways So forth to Google (other search engines are available)... which lead me to a fairly old article on WLDJ - Removing Performance Bottlenecks Through JSP Precompilation. Technololgy wise, it's somewhat out of date, but the one good point that it made is that it's really not very useful to try and use the precompile option in the weblogic.xml file. That's a really good observation - particularly if you're trying to integrate a pre-compile step into a Hudson Continuous Integration process. That same article mentioned an alternative approach for programmatic pre-compilation using weblogic.jspc. This seemed like a much more useful approach for a CI environment. However, weblogic.jspc is now obsoleted by weblogic.appc so we'll use that instead. Thanks to Steve for the pointer there. And So To APPC APPC has documentation - always a great place to start, and supports usage both from Ant via the wlappc task and from the command line using the weblogic.appc command. In my testing I took the latter approach. Usage, as the documentation will show you, is superficially pretty simple. The nice thing here, is that you can pass an existing EAR file (generated of course using OJDeploy) and that EAR will be updated in place with the freshly compiled servlet classes created from the JSPs. Appc takes care of all the unpacking, compiling and re-packing of the EAR for you. Neat. So we're done right...? Not quite. The Devil is in the Detail OK so I'm being overly dramatic but it's not all plain sailing, so here's a short guide to using weblogic.appc to compile a simple ADF application without pain. Information You'll Need The following is based on the assumption that you have a stand-alone WLS install with the Application Development Runtime installed and a suitable ADF enabled domain created. This could of course all be run off of a JDeveloper install as well 1. Your Weblogic home directory. Everything you need is relative to this so make a note. In my case it's c:\builds\wls_ps4. 2. Next deploy your EAR as normal and have a peek inside it using your favourite zip management tool. First of all look at the weblogic-application.xml inside the EAR /META-INF directory. Have a look for any library references. Something like this: <library-ref> <library-name>adf.oracle.domain</library-name> </library-ref> Make a note of the library ref (adf.oracle.domain in this case) , you'll need that in a second. 3. Next open the nested WAR file within the EAR and then have a peek inside the weblogic.xml file in the /WEB-INF directory. Again make a note of the library references. 4. Now start the WebLogic as per normal and run the WebLogic console app (e.g. http://localhost:7001/console). In the Domain Structure navigator, select Deployments. 5. For each of the libraries you noted down drill into the library definition and make a note of the .war, .ear or .jar that defines the library. For example, in my case adf.oracle.domain maps to "C:\ builds\ WLS_PS4\ oracle_common\ modules\ oracle. adf. model_11. 1. 1\ adf. oracle. domain. ear". Note the extra spaces that are salted throughout this string as it is displayed in the console - just to make it annoying, you'll have to strip these out. 6. Finally you'll need the location of the adfsharebean.jar. We need to pass this on the classpath for APPC so that the ADFConfigLifeCycleCallBack listener can be found. In a more complex app of your own you may need additional classpath entries as well. Now we're ready to go, and it's a simple matter of applying the information we have gathered into the relevant command line arguments for the utility A Simple CMD File to Run APPC Here's the stub .cmd file I'm using on Windows to run this. @echo offREM Stub weblogic.appc Runner setlocal set WLS_HOME=C:\builds\WLS_PS4 set ADF_LIB_ROOT=%WLS_HOME%\oracle_common\modulesset COMMON_LIB_ROOT=%WLS_HOME%\wlserver_10.3\common\deployable-libraries set ADF_WEBAPP=%ADF_LIB_ROOT%\oracle.adf.view_11.1.1\adf.oracle.domain.webapp.war set ADF_DOMAIN=%ADF_LIB_ROOT%\oracle.adf.model_11.1.1\adf.oracle.domain.ear set JSTL=%COMMON_LIB_ROOT%\jstl-1.2.war set JSF=%COMMON_LIB_ROOT%\jsf-1.2.war set ADF_SHARE=%ADF_LIB_ROOT%\oracle.adf.share_11.1.1\adfsharembean.jar REM Set up the WebLogic Environment so appc can be found call %WLS_HOME%\wlserver_10.3\server\bin\setWLSEnv.cmd CLS REM Now compile away!java weblogic.appc -verbose -library %ADF_WEBAPP%,%ADF_DOMAIN%,%JSTL%,%JSF% -classpath %ADF_SHARE% %1 endlocal Running the above on a target ADF .ear file will zip through and create all of the relevant compiled classes inside your nested .war file in the \WEB-INF\classes\jsp_servlet\ directory (but don't take my word for it, run it and take a look!) And So... In the immortal words of the Pet Shop Boys, Was It Worth It? Well, here's where you'll have to do your own testing. In my case here, with a simple ADF application, pre-compilation shaved an non-scientific "3 Elephants" off of the initial page load time for the first access of each page. That's a pretty significant payback for such a simple step to add into your CI process, so why not give it a go.

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Essence of BiMap in Google collections

- by littleEinstein

I am still quite puzzled at the BiMap in Google collections/Guava. It was claimed that The two bimaps are backed by the same data; any changes to one will appear in the other. I browsed through the source code, and I found the use of delegate in ForwardingMap. But in any actually subclass of StandardBiMap, I do see the data are put into both the forward and reverse map. So what is the essence, and why it claims to have saved space by keeping only one copy of the data? Is it just the actual objects are one set, but two distinct sets of references to these objects are still needed, one set maintained in forward map, and the other in reverse map? private V putInBothMaps(K key, V value, boolean force) { boolean containedKey = containsKey(key); if (containedKey && Objects.equal(value, get(key))) { return value; } if (force) { inverse().remove(value); } else if (containsValue(value)) { throw new IllegalArgumentException( "value already present: " + value); } V oldValue = super.put(key, value); updateInverseMap(key, containedKey, oldValue, value); return oldValue; }

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How to improve performance of non-scalar aggregations on denormalized tables

- by The Lazy DBA

Suppose we have a denormalized table with about 80 columns, and grows at the rate of ~10 million rows (about 5GB) per month. We currently have 3 1/2 years of data (~400M rows, ~200GB). We create a clustered index to best suit retrieving data from the table on the following columns that serve as our primary key... [FileDate] ASC, [Region] ASC, [KeyValue1] ASC, [KeyValue2] ASC ... because when we query the table, we always have the entire primary key. So these queries always result in clustered index seeks and are therefore very fast, and fragmentation is kept to a minimum. However, we do have a situation where we want to get the most recent FileDate for every Region, typically for reports, i.e. SELECT [Region] , MAX([FileDate]) AS [FileDate] FROM HugeTable GROUP BY [Region] The "best" solution I can come up to this is to create a non-clustered index on Region. Although it means an additional insert on the table during loads, the hit isn't minimal (we load 4 times per day, so fewer than 100,000 additional index inserts per load). Since the table is also partitioned by FileDate, results to our query come back quickly enough (200ms or so), and that result set is cached until the next load. However I'm guessing that someone with more data warehousing experience might have a solution that's more optimal, as this, for some reason, doesn't "feel right".

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SQL Server: Output an XML field as tabular data using a stored procedure

- by Pawan

I am using a table with an XML data field to store the audit trails of all other tables in the database. That means the same XML field has various XML information. For example my table has two records with XML data like this: 1st record: <client> <name>xyz</name> <ssn>432-54-4231</ssn> </client> 2nd record: <emp> <name>abc</name> <sal>5000</sal> </emp> These are the two sample formats and just two records. The table actually has many more XML formats in the same field and many records in each format. Now my problem is that upon query I need these XML formats to be converted into tabular result sets. What are the options for me? It would be a regular task to query this table and generate reports from it. I want to create a stored procedure to which I can pass that I need to query "<emp>" or "<client>", then my stored procedure should return tabular data.

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Excel VBA Macro for Pivot Table with Dynamic Data Range

- by John Ziebro

CODE IS WORKING! THANKS FOR THE HELP! I am attempting to create a dynamic pivot table that will work on data that varies in the number of rows. Currently, I have 28,300 rows, but this may change daily. Example of data format as follows: Case Number Branch Driver 1342 NYC Bob 4532 PHL Jim 7391 CIN John 8251 SAN John 7211 SAN Mary 9121 CLE John 7424 CIN John Example of finished table: Driver NYC PHL CIN SAN CLE Bob 1 0 0 0 0 Jim 0 1 0 0 0 John 0 0 2 1 1 Mary 0 0 0 1 0 Code as follows: Sub CreateSummaryReportUsingPivot() ' Use a Pivot Table to create a static summary report ' with model going down the rows and regions across Dim WSD As Worksheet Dim PTCache As PivotCache Dim PT As PivotTable Dim PRange As Range Dim FinalRow As Long Dim FinalCol As Long Set WSD = Worksheets("PivotTable") 'Name active worksheet as "PivotTable" ActiveSheet.Name = "PivotTable" ' Delete any prior pivot tables For Each PT In WSD.PivotTables PT.TableRange2.Clear Next PT ' Define input area and set up a Pivot Cache FinalRow = WSD.Cells(Application.Rows.Count, 1).End(xlUp).Row FinalCol = WSD.Cells(1, Application.Columns.Count). _ End(xlToLeft).Column Set PRange = WSD.Cells(1, 1).Resize(FinalRow, FinalCol) Set PTCache = ActiveWorkbook.PivotCaches.Add(SourceType:= _ xlDatabase, SourceData:=PRange) ' Create the Pivot Table from the Pivot Cache Set PT = PTCache.CreatePivotTable(TableDestination:=WSD. _ Cells(2, FinalCol + 2), TableName:="PivotTable1") ' Turn off updating while building the table PT.ManualUpdate = True ' Set up the row fields PT.AddFields RowFields:="Driver", ColumnFields:="Branch" ' Set up the data fields With PT.PivotFields("Case Number") .Orientation = xlDataField .Function = xlCount .Position = 1 End With With PT .ColumnGrand = False .RowGrand = False .NullString = "0" End With ' Calc the pivot table PT.ManualUpdate = False PT.ManualUpdate = True End Sub

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Export database data to csv from view by date range asp.net mvc3

- by Benjamin Randal

I am trying to find a way to export data from my database and save it as a .csv file. Ideally the user will be able to select a date range on a view, which will display the data to be exported, then the user can click an "export to CSV" link. I've done quite a bit of searching and but have not found much specific enough to help me step through the process. Any help would be great. I would like to export data from this database model... { public class InspectionInfo { [Key] public int InspectionId { get; set; } [DisplayName("Date Submitted")] [DataType(DataType.Date)] // [Required] public DateTime Submitted { get; set; } [DataType(DataType.MultilineText)] [MaxLength(1000)] // [Required] public string Comments { get; set; } // [Required] public Contact Contact { get; set; } [ForeignKey("Contact")] public Int32 ContactId { get; set; } [MaxLength(100)] public String OtherContact { get; set; } I have a service for search also, just having difficulty implementing public SearchResults SearchInspections(SearchRequest request) { using (var db = new InspectionEntities()) { var results = db.InspectionInfos .Where( i=> ( (null == request.StartDate || i.Submitted >= request.StartDate.Value) && (null == request.EndDate || i.Submitted <= request.EndDate.Value) ) ) .OrderBy(i=>i.Submitted) .Skip(request.PageSize*request.PageIndex).Take(request.PageSize); return new SearchResults{ TotalResults=results.Count(), PageIndex=request.PageIndex, Inspections=results.ToList(), SearchRequest=request }; } }

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Data is not saved in MS Access database

- by qwerty

Hello, I have a visual C# project and i'm trying to insert data in a MS Access Database when i press a button. Here is the code: private void button1_Click(object sender, EventArgs e) { try { OleDbDataAdapter adapter=new OleDbDataAdapter(); adapter.InsertCommand = new OleDbCommand(); adapter.InsertCommand.CommandText = "insert into Candidati values ('" + maskedTextBox1.Text.Trim() + "','" + textBox1.Text.Trim() + "', '" + textBox2.Text.Trim() + "', '" + textBox3.Text.Trim() + "','" + Convert.ToDouble(maskedTextBox2.Text) + "','" + Convert.ToDouble(maskedTextBox3.Text) + "')"; con.Open(); adapter.InsertCommand.Connection = con; adapter.InsertCommand.ExecuteNonQuery(); con.Close(); MessageBox.Show("Inregistrare adaugata cu succes!"); maskedTextBox1.Text = null; maskedTextBox2.Text = null; maskedTextBox3.Text = null; textBox1.Text = null; textBox2.Text = null; textBox3.Text = null; maskedTextBox1.Focus(); } catch (AdmitereException exc) { MessageBox.Show("A aparut o exceptie: "+exc.Message, "Eroare!", MessageBoxButtons.OK, MessageBoxIcon.Error); } } The connection string is: private static string connectionString; OleDbConnection con; public AddCandidati() { connectionString = "Provider=Microsoft.JET.OLEDB.4.0;Data Source=Admitere.mdb"; con = new OleDbConnection(connectionString); InitializeComponent(); } Where AddCandidati is the form. The data is not saved in the database, why? I have the .mdb file in the project folder.. What i'm doing wrong? I did not got any exception when i press the button.. Thanks!

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populate FusionCharts with XML data AJAX

- by Mick

Hi I have a js file that uses ajax to get a XML doc from a php script . The XML file forms the data to draw a Fusion Chart. I know I am getting the XML data ok but FusionCharts will not draw it . I would really appreciate any help , thanks (FusionCharts.js is included earlier in my script) if(XMLHttpRequestObject) { XMLHttpRequestObject.open("GET", "chart.php?job="+job, true); XMLHttpRequestObject.onreadystatechange = function() { if (XMLHttpRequestObject.readyState == 4 && XMLHttpRequestObject.status == 200) { var xdoc = XMLHttpRequestObject.responseXML; var chart1 = new FusionCharts("Pie3D.swf", "chart1Id", "400", "300", "0", "1"); chart1.setDataXML(xdoc); chart1.render("chart1div"); chart.php produces this XML data <chart caption='ADI Chart Test ' > <set label='Driver' value='12.25' /> <set label='Other Staff' value='223.21' /> <set label='Equipment' value='0.00' /> <set label='Additional Items' value='0.00' /> <set label='Vehicle Fuel' value='0.00' /> <set label='Accomodation' value='0.00' /> <set label='Generator Fuel' value='0.00' /> </chart>

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Database access through collections

- by Mike

Hi All, I have an 3 tiered application where I need to get database results and populated the UI. I have a MessagesCollection class that deals with messages. I load my user from the database. On the instantiation of a user (ie. new User()), a MessageCollection Messages = new MessageCollection(this) is performed. Message collection accepts a user as a parameter. User user = user.LoadUser("bob"); I want to get the messages for Bob. user.Messages.GetUnreadMessages(); GetUnreadMessages calls my Business Data provider which in turn calls the data access layer. The Business data provider returns List. My question is - I am not sure what the best practice is here - If I have a collection of messages in an array inside the MessagesCollection class, I could implement ICollection to provide GetEnumerator() and ability to traverse the messages. But what happens if the messages change and the the user has old messages loaded? What about big message collections? What if my user had 10,000 unread messages? I don't think accessing the database and returning 10,000 Message objects would be efficient.

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How to organize integrity tests and code unit tests?

- by karlthorwald

I have several files with code testing code (which uses a "unittest" class). Later I found it would be nice to test database integrity also. I put this into a separate directory tree. (Things like the keys have correct format, parent and child nodes are pointing correctly and such.) I use the same unittest class for the integrity tests. Now I wonder if it makes really sense to keep this separate. To test the integrity of data I often duplicate parts of code that I use to test the code that handles the data. But it is not the same. The code tests use test databases (that get deleted after each test) and the integrity tests connect to the live data and analyze it. The integrity tests I want to call from cron and send an alarm if something happens in the live database. How would you handle that? Are there standards for such a setup? What is your experience? My tendency is to put everything in the same file, which would result in the code tests also being executed by the cron on the production environment.

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