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Merge branch 'master' of github.com:qgis/Quantum-GIS

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timlinux committed Sep 7, 2012
2 parents 6e63f9f + 3a4fa2f commit 4d630b7d792b3ee77f5f47ec7efd9ac212e5c53d
@@ -0,0 +1,19 @@
<h3>coalesce() function</h3>
Returns the first non-NULL value from the expression list.
<br>
This function can take any number of arguments.
<h4>Syntax</h4>
<code>coalesce(expression1, expression2 ...)</code><br>

<h4>Arguments</h4>
<code>expression</code> - any valid expression or value, irregardless of type.
<br>

<h4>Example</h4>
<!-- Show example of function.-->
<code>coalesce(NULL, 2) &rarr; 2</code><br>
<code>coalesce(NULL, 2, 3) &rarr; 2</code><br>
<code>coalesce(7, NULL, 3*2) &rarr; 7</code><br><br>
<code>coalesce("fieldA", "fallbackField", 'ERROR') &rarr; value of fieldA if it is non-NULL
else the value of "fallbackField" or the string 'ERROR' if both are NULL</code><br>

@@ -92,6 +92,9 @@ TARGET_LINK_LIBRARIES(qgis.g.info
${GRASS_LIBRARY_gproj}
${GDAL_LIBRARY}
)
IF (UNIX)
TARGET_LINK_LIBRARIES(qgis.g.info m)
ENDIF (UNIX)

########################################################
# Install
@@ -295,6 +295,9 @@ class TestQgsExpression: public QObject
QTest::newRow( "condition else" ) << "case when 1=0 then 'bad' else 678 end" << false << QVariant( 678 );
QTest::newRow( "condition null" ) << "case when length(123)=0 then 111 end" << false << QVariant();
QTest::newRow( "condition 2 when" ) << "case when 2>3 then 23 when 3>2 then 32 else 0 end" << false << QVariant( 32 );
QTest::newRow( "coalesce null" ) << "coalesce(NULL)" << false << QVariant( );
QTest::newRow( "coalesce mid-null" ) << "coalesce(1, NULL, 3)" << false << QVariant( 1 );
QTest::newRow( "coalesce exp" ) << "coalesce(NULL, 1+1)" << false << QVariant( 2 );

// Datetime functions
QTest::newRow( "to date" ) << "todate('2012-06-28')" << false << QVariant( QDate( 2012, 6, 28 ) );

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