THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
WorkingWithStoredProcedures
The DAS can work with stored procedures in the same way it works with SQL statements. The following example should look familiar except that a stored prcedure call statement replaces the typical SELECT statement:
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DAS das = |
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| h1. WorkingWithStoredProcedures
The DAS can work with stored procedures in the same way it works with SQL statements. The following example should look familiar except that a stored prcedure call statement replaces the typical SELECT statement:
{panel}
DAS das = DAS.FACTORY.createDAS(getConnection());
read = das.createCommand("{call GETALLCOMPANIES()}");
root = read.executeQuery(); {panel} |
The
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predefined
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stored
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procedure
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"GETALLCOMPANIES"
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returnes
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a
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result
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just
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like
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"select
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*
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from
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company"
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would.
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There
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are,
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however,
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procedures
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that
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do
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not
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return
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results
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and
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these
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calls
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can
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also
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be
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executed
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with
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the
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same
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programming
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model.
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In
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fact
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any
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arbitrary
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stored
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procedure
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can
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be
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invoked
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in
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this
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way.
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The
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follwing
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example
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calls
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a
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proc
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that
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deletes
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an
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identified
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company:
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DAS das = {panel} DAS das =DAS.FACTORY.createDAS(getConnection());
delete = das.createCommand("{call DELETECUSTOMER(?)}");
1234);
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Stored
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procedures
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may
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also
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provide
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IN/OUT
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and
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OUT
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parameters.
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The
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following
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illustrates
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the
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use
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of
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a
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stored
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procedure
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that
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returns
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a
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result
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set
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as
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well
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as
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an
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OUT
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parameter:
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DAS das = {panel} DAS das =DAS.FACTORY.createDAS(getConfig("storedProcTest.xml"), getConnection());
read = das.getCommand("getNamedCustomers");
"Williams");
root = read.executeQuery(); Integer customersRead = (Integer) read.getParameter(2); {panel} |
This
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example
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makes
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use
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of
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a
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configuration
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file
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to
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define
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the
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command
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including
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the
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OUT
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parameter:
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<Config xsi:noNamespaceSchemaLocation="http:///org.apache.tuscany.das.rdb/config.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"> <Command name="getNamedCustomers" SQL="{call GETNAMEDCUSTOMERS(?,?)}" kind="procedure"> <Parameter direction="IN" columnType="commonj.sdo.String"/> <Parameter direction="OUT" columnType="commonj.sdo.IntObject"/> </Command> </Config> |
This
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stored
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procedure
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is
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defined
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such
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that
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the
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first
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argument
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provides
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a
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name
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to
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match
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when
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looking
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for
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customers
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and
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the
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second
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argument
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is
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an
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OUT
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parameter
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and
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providing
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the
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number
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of
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customers
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that
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match
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the
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provided
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name.
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The
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proc
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also
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returns
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the
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list
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of
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matching
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Customers.
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