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<H1><A name="Namedparameterssupport-Namedparameterssupport"></A>Named parameters support</H1>
<P>JDB API requires indexed parameter setting. i.e. statement.setXXX(int, value). But in the DAS client<BR>
it may be helpful to provide named parameters setting on the command. This is particularly convenient<BR>
when the table involves many columns during insert/update. </P>
<P>Below are config schema portion supporting this.</P>
<DIV class="preformatted panel" style="border-width: 1px;"><DIV class="preformattedContent panelContent">
<PRE><xsd:complexType name="Parameter">
<xsd:attribute name="name" type="xsd:string"/>
<xsd:attribute name="columnType" type="xsd:string"/>
<xsd:attribute name="direction" type="xsd:string" default="IN"/>
<xsd:attribute name="index" type="xsd:int"/>
</xsd:complexType>
<xsd:complexType name="Parameters">
<xsd:sequence>
<xsd:element maxOccurs="unbounded" minOccurs="0" name="Parameter" type="config:Parameter"/>
</xsd:sequence>
</xsd:complexType>
<xsd:complexType name="Create">
<xsd:sequence>
<xsd:element maxOccurs="1" minOccurs="0" name="Parameters" type="config:Parameters"/>
</xsd:sequence>
<xsd:attribute name="sql" type="xsd:string"/>
</xsd:complexType>
<xsd:complexType name="Update">
<xsd:sequence>
<xsd:element maxOccurs="1" minOccurs="0" name="Parameters" type="config:Parameters"/>
</xsd:sequence>
<xsd:attribute name="sql" type="xsd:string"/>
</xsd:complexType>
<xsd:complexType name="Delete">
<xsd:sequence>
<xsd:element maxOccurs="1" minOccurs="0" name="Parameters" type="config:Parameters"/>
</xsd:sequence>
<xsd:attribute name="sql" type="xsd:string"/>
</xsd:complexType>
<xsd:complexType name="Command">
<xsd:sequence>
<xsd:element maxOccurs="unbounded" minOccurs="0" name="Parameter" type="config:Parameter"/>
<xsd:element maxOccurs="unbounded" minOccurs="0" name="ResultDescriptor" type="config:ResultDescriptor"/>
</xsd:sequence>
<xsd:attribute name="name" type="xsd:string"/>
<xsd:attribute name="SQL" type="xsd:string"/>
<xsd:attribute name="kind" type="xsd:string"/>
</xsd:complexType>
</PRE>
</DIV></DIV>
<P>User can do Command.setParameter(String name, Object value), getParameter(String name). Indexed set/getParameter() is available as before. Also <create>, <update>, <delete> from Config support named parameters.</P>
<P>example config:</P>
<DIV class="preformatted panel" style="border-width: 1px;"><DIV class="preformattedContent panelContent">
<PRE><Config xmlns="http:///org.apache.tuscany.das.rdb/config.xsd">
<Table tableName="CUSTOMER">
<create sql="insert into customer values (?, ?, ?)" >
<Parameters>
<Parameter name="ID" index="1"/>
<Parameter name="LASTNAME" index="1"/>
<Parameter name="ADDRESS" index="3"/>
</Parameters>
</create>
</Table>
<Command name="createCustomer" SQL="insert into CUSTOMER values ( ?, ?, ?)" kind="Insert">
<Parameter name="ID" index="1"/>
<Parameter name="LASTNAME" index="2"/>
<Parameter name="ADDRESS" index="3"/>
</Command>
</PRE>
</DIV></DIV>
<P>if +ve index is specified in Parameter, it is used, else auto-increment is used. As List is an ordered collection, the sequence(index value) appearing in the cofig file will be maintained. Partially specifying indexes is not supported (i.e. give index for 2 out of 3 params and leave one without it, is not supported)<BR>
Also, if indexes are specified, the ordering in config is flexible, i.e. below is valid.</P>
<DIV class="preformatted panel" style="border-width: 1px;"><DIV class="preformattedContent panelContent">
<PRE><Command name="createCustomer" SQL="insert into CUSTOMER values ( ?, ?, ?)" kind="Insert">
<Parameter name="LASTNAME" index="2"/>
<Parameter name="ID" index="1"/>
<Parameter name="ADDRESS" index="3"/>
</Command>
</PRE>
</DIV></DIV>
<P><B>Note</B> Convention over config is followed, if Parameters are not defined in config, the sequence<BR>
should match the table columns <B>convention</B>,else user should specify params on command in config and specify index attributes in them <B>config</B></P>
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