OC4J EJB 2.1 EJB QL Extensions

Although EJB 2.1 does not support square root, date, time, and timestamp types, OC4J provides proprietary EJB QL extensions to support these types in EJB 2.1, as follows:

• SQRT(v): Both the double primitive type and the java.lang.Double types are supported for arguments (see Example 16-5).

• You can use the following date, time, and timestamp types in an EJB QL binary expression, such as the following equality expressions:

  • java.util.Date (see Example 16-6

  • java.sql.Date (see Example 16-7)

  • java.sql.Time (see Example 16-8)

  • java.sql.Timestamp (see Example 16-9)

Note:

These types are fully supported in EJB 3.0 EJB QL.

Example 16-5 Using the EJB 2.1 EJB QL Extension for SQRT

<query> 
  <query-method> 
    <method-name>ejbSelectDoubleTypeSqrt</method-name> 
    <method-params> 
      <method-param>double</method-param> 
    </method-params> 
  </query-method> 
  <result-type-mapping>Remote</result-type-mapping> 
  <ejb-ql> 
    SELECT OBJECT(a) FROM Dept a WHERE a.deptDoubleType = SQRT(?1) 
  </ejb-ql> 
</query> 

Example 16-6 Using the EJB 2.1 EJB QL Extension for java.util.Date

<query> 
  <query-method> 
   <method-name>ejbSelectDate</method-name> 
   <method-params> 
    <method-param>java.util.Date</method-param> 
   </method-params> 
  </query-method> 
  <result-type-mapping>Remote</result-type-mapping> 
  <ejb-ql> 
    SELECT OBJECT(a) FROM Dept a WHERE a.deptDate = ?1 
   </ejb-ql> 
</query> 

Example 16-7 Using the EJB 2.1 EJB QL Extension for java.sql.Date

<query> 
  <query-method> 
   <method-name>ejbSelectSqlDate</method-name> 
   <method-params> 
    <method-param>java.sql.Date</method-param> 
   </method-params> 
  </query-method> 
  <result-type-mapping>Remote</result-type-mapping> 
  <ejb-ql> 
    SELECT OBJECT(a) FROM Dept a WHERE a.deptSqlDate = ?1 
  </ejb-ql> 
</query> 

Example 16-8 Using the EJB 2.1 EJB QL Extension for java.sql.Time

<query> 
  <query-method> 
   <method-name>findByTimestamp</method-name> 
   <method-params> 
    <method-param>java.sql.Time</method-param> 
   </method-params> 
  </query-method> 
  <result-type-mapping>Remote</result-type-mapping> 
  <ejb-ql> 
    SELECT OBJECT(a) FROM Dept a WHERE a.deptTime = ?1 
  </ejb-ql> 
</query> 

Example 16-9 Using the EJB 2.1 EJB QL Extension for java.sql.Timestamp

<query> 
  <query-method> 
   <method-name>findByTimestamp</method-name> 
   <method-params> 
    <method-param>java.sql.Timestamp</method-param> 
   </method-params> 
  </query-method> 
  <result-type-mapping>Remote</result-type-mapping> 
  <ejb-ql> 
    SELECT OBJECT(a) FROM Dept a WHERE a.deptTimestamp = ?1 
  </ejb-ql> 
</query>