XSLT big integer (int64) handling msxml
- by Farid Z
When trying to do math on an big integer (int64) large number in xslt template I get the wrong result since there is no native 64-bit integer support in xslt (xslt number is 64-bit double). I am using msxml 6.0 on Windows XP SP3. Are there any work around for this on Windows?
<tables>
<table>
<table_schem>REPADMIN</table_schem>
<table_name>TEST_DESCEND_IDENTITY_BIGINT</table_name>
<column>
<col_name>COL1</col_name>
<identity>
<col_min_val>9223372036854775805</col_min_val>
<col_max_val>9223372036854775805</col_max_val>
<autoincrementvalue>9223372036854775807</autoincrementvalue>
<autoincrementstart>9223372036854775807</autoincrementstart>
<autoincrementinc>-1</autoincrementinc>
</identity>
</column>
</table>
</tables>
This test returns true due to overflow (I am assuming) but actually is false if I could tell the xslt processor somehow to use int64 rather than the default 64-bit double for the data since big integer is the actual data type for the numbers in the xml input.
<xsl:when test="autoincrementvalue =
(col_min_val + autoincrementinc)">
<xsl:value-of select="''"/>
</xsl:when>
here is the complete template
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" >
<!--Reseed Derby identity column-->
<xsl:output omit-xml-declaration='yes' method='text' />
<xsl:param name="stmtsep">;</xsl:param>
<xsl:param name="schemprefix"></xsl:param>
<xsl:template match="tables">
<xsl:variable name="identitycount" select="count(table/column/identity)"></xsl:variable>
<xsl:for-each select="table/column/identity">
<xsl:variable name="table_schem" select="../../table_schem"></xsl:variable>
<xsl:variable name="table_name" select="../../table_name"></xsl:variable>
<xsl:variable name="tablespec">
<xsl:if test="$schemprefix">
<xsl:value-of select="$table_schem"/>.</xsl:if><xsl:value-of
select="$table_name"/></xsl:variable>
<xsl:variable name="col_name" select="../col_name"></xsl:variable>
<xsl:variable name="newstart">
<xsl:choose>
<xsl:when test="autoincrementinc > 0">
<xsl:choose>
<xsl:when test="col_max_val = '' and
autoincrementvalue = autoincrementstart">
<xsl:value-of select="''"/>
</xsl:when>
<xsl:when test="col_max_val = ''">
<xsl:value-of select="autoincrementstart"/>
</xsl:when>
<xsl:when test="autoincrementvalue =
(col_max_val + autoincrementinc)">
<xsl:value-of select="''"/>
</xsl:when>
<xsl:when test="(col_max_val + autoincrementinc) <
autoincrementstart">
<xsl:value-of select="autoincrementstart"/>
</xsl:when>
<xsl:otherwise>
<xsl:value-of select="col_max_val + autoincrementinc"/>
</xsl:otherwise>
</xsl:choose>
</xsl:when>
<xsl:when test="autoincrementinc < 0">
<xsl:choose>
<xsl:when test="col_min_val = '' and
autoincrementvalue = autoincrementstart">
<xsl:value-of select="''"/>
</xsl:when>
<xsl:when test="col_min_val = ''">
<xsl:value-of select="autoincrementstart"/>
</xsl:when>
<xsl:when test="autoincrementvalue =
(col_min_val + autoincrementinc)">
<xsl:value-of select="''"/>
</xsl:when>
<xsl:when test="(col_min_val + autoincrementinc) >
autoincrementstart">
<xsl:value-of select="autoincrementstart"/>
</xsl:when>
<xsl:otherwise>
<xsl:value-of select="col_min_val + autoincrementinc"/>
</xsl:otherwise>
</xsl:choose>
</xsl:when>
</xsl:choose>
</xsl:variable>
<xsl:if test="not(position()=1)"><xsl:text>
</xsl:text></xsl:if>
<xsl:choose>
<!--restart with ddl changes both the next identity value AUTOINCREMENTVALUE and
the identity start number AUTOINCREMENTSTART eventhough in this casewe only want
to change only the next identity number-->
<xsl:when test="$newstart != '' and
$newstart != autoincrementvalue">alter table <xsl:value-of
select="$tablespec"/> alter column <xsl:value-of
select="$col_name"/> restart with <xsl:value-of
select="$newstart"/><xsl:if test="$identitycount>1">;</xsl:if></xsl:when>
<xsl:otherwise>-- reseed <xsl:value-of select="$tablespec"/> is not necessary</xsl:otherwise>
</xsl:choose>
</xsl:for-each>
</xsl:template>
</xsl:stylesheet>
