Examples of oracle.toplink.essentials.internal.queryframework.DatabaseQueryMechanism

Package oracle.toplink.essentials.internal.queryframework

Examples of oracle.toplink.essentials.internal.queryframework.DatabaseQueryMechanism

oracle.toplink.essentials.internal.queryframework.DatabaseQueryMechanism

Purpose: Abstract class for all database query mechanism objects. DatabaseQueryMechanism is actually a helper class and currently is required for all types of queries. Most of the work performed by the query framework is performed in the query mechanism. The query mechanism contains the internal knowledge necessary to perform the specific database operation.

Responsibilities: Provide a common protocol for query mechanism objects. Provides all of the database specific work for the assigned query. @author Yvon Lavoie @since TOPLink/Java 1.0

     * there is a where clause, use its expression builder.
     * If after this method defaultBuilder is still null,
     * then initializeDefaultBuilder method will generate and cache it.
     */
    protected void initializeQuerySpecificDefaultBuilder() {
        DatabaseQueryMechanism mech = getQueryMechanism();
        if (mech.isExpressionQueryMechanism() && ((ExpressionQueryMechanism)mech).getExpressionBuilder() != null) {
            this.defaultBuilder = ((ExpressionQueryMechanism)mech).getExpressionBuilder();
        }
    }

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