1 grid.result.isEmpty

Release 2017.3

Tag available since version 2017.3.

Returns a boolean to indicate if a query on grid returns no data. 

<grid.result.isEmpty>
    <resultSet /> !
</grid.result.isEmpty>
It is necessary to check if the grid has data before starts to do forward on the result set. If you try to show data from an empty grid an exception ocurs
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XSQLScriptException[java.sql.SQLException: resultset is closed.]
Example
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<xsql-script>
    <body>
        <connection name='sysmaster1'>
            <set name='rs'>
                <!-- Run a multi database query, returning a memory result set. -->
                <!-- Each db has it's pool configuration timeout but can be owerride via timeout !=0 -->

                <select.grid name='grid_demo' timeout='30'>
                    <columns>tabname, nrows, npused</columns>
                    <from table='systables' />
                    <where>tabname LIKE 'capuntes%'</where>
                </select.grid>
            </set>
        </connection>

        <if>
            <expr><grid.result.isEmpty><rs/></grid.result.isEmpty></expr>
            <then>
                <println>... The grid is empty.</println>
            </then>
            <else>
                <println>... The grid contains data:</println>
                <println>
                    <rs/>
                </println>
            </else>
        </if>
        
    </body>
</xsql-script>
... The grid contains data:
+--------+-----------+----------+--------------+----------+
|tabname |nrows      |npused    |grid_node     |grid_error|
|varchar |float      |float     |char          |char      |
|visible |visible    |visible   |visible       |visible   |
+--------+-----------+----------+--------------+----------+
|capuntes|   7887,000|  1604,000|demo_sports   |          |
|capuntes| 442028,000| 89265,000|demo_industria|          |
|capuntes|4557441,000|955229,000|demo_cons     |          |
+--------+-----------+----------+--------------+----------+
Example
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<xsql-script>
    <body>
        <connection name='sysmaster1'>
            <set name='rs'>
                <!-- Run a multi database query, returning a memory result set. -->
                <!-- Each db has it's pool configuration timeout but can be owerride via timeout !=0 -->

                <select.grid name='grid_demo' timeout='30'>
                    <columns>tabname, nrows, npused</columns>
                    <from table='non_existent_table' />
                    <where>tabname LIKE 'capuntes%'</where>
                </select.grid>
            </set>
        </connection>

        <if>
            <expr><grid.result.isEmpty><rs/></grid.result.isEmpty></expr>
            <then>
                <println>... The grid is empty.</println>
            </then>
            <else>
                <println>... The grid contains data:</println>
                <println>
                    <rs/>
                </println>
            </else>
        </if>
        
    </body>
</xsql-script>
... The grid is empty.