DynamicQL allows the runtime generation and execution of JBossQL queries. A DynamicQL query method is an abstract method that takes a JBossQL query and the query arguments as parameters. JBoss compiles the JBossQL and executes the generated SQL. The following generates a JBossQL query that selects all the gangsters that have a hangout in any state in the states set:
public abstract class GangsterBean
implements EntityBean
{
public Set ejbHomeSelectInStates(Set states)
throws FinderException
{
// generate JBossQL query
StringBuffer jbossQl = new StringBuffer();
jbossQl.append("SELECT OBJECT(g) ");
jbossQl.append("FROM gangster g ");
jbossQl.append("WHERE g.hangout.state IN (");
for (int i = 0; i < states.size(); i++) {
if (i > 0) {
jbossQl.append(", ");
}
jbossQl.append("?").append(i+1);
}
jbossQl.append(") ORDER BY g.name");
// pack arguments into an Object[]
Object[] args = states.toArray(new Object[states.size()]);
// call dynamic-ql query
return ejbSelectGeneric(jbossQl.toString(), args);
}
}
public abstract class GangsterBean
implements EntityBean
{
public Set ejbHomeSelectInStates(Set states)
throws FinderException
{
// generate JBossQL query
StringBuffer jbossQl = new StringBuffer();
jbossQl.append("SELECT OBJECT(g) ");
jbossQl.append("FROM gangster g ");
jbossQl.append("WHERE g.hangout.state IN (");
for (int i = 0; i < states.size(); i++) {
if (i > 0) {
jbossQl.append(", ");
}
jbossQl.append("?").append(i+1);
}
jbossQl.append(") ORDER BY g.name");
// pack arguments into an Object[]
Object[] args = states.toArray(new Object[states.size()]);
// call dynamic-ql query
return ejbSelectGeneric(jbossQl.toString(), args);
}
}
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The DynamicQL select method may have any valid select method name, but the method must always take a string and an object array as parameters. DynamicQL is declared in the jbosscmp-jdbc.xml file with an empty dynamic-ql element. The following is the declaration for ejbSelectGeneric.
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