Examples of org.eclipse.persistence.internal.queries.DatabaseQueryMechanism

Package org.eclipse.persistence.internal.queries

Examples of org.eclipse.persistence.internal.queries.DatabaseQueryMechanism

org.eclipse.persistence.internal.queries.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

     * Initialize the expression builder which should be used for this query. If
     * there is a where clause, use its expression builder, otherwise
     * generate one and cache it. This helps avoid unnecessary rebuilds.
     */
    protected void initializeDefaultBuilder() {
        DatabaseQueryMechanism mech = getQueryMechanism();
        if (mech.isExpressionQueryMechanism() && ((ExpressionQueryMechanism)mech).getExpressionBuilder() != null) {
            this.defaultBuilder = ((ExpressionQueryMechanism)mech).getExpressionBuilder();
            if (this.defaultBuilder.getQueryClass() != null && !this.defaultBuilder.getQueryClass().equals(this.referenceClass)){
                this.defaultBuilder = new ExpressionBuilder();
            }
            return;

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     * Initialize the expression builder which should be used for this query. If
     * there is a where clause, use its expression builder, otherwise
     * generate one and cache it. This helps avoid unnecessary rebuilds.
     */
    protected void initializeDefaultBuilder() {
        DatabaseQueryMechanism mech = getQueryMechanism();
        if (mech.isExpressionQueryMechanism() && ((ExpressionQueryMechanism)mech).getExpressionBuilder() != null) {
            this.defaultBuilder = ((ExpressionQueryMechanism)mech).getExpressionBuilder();
            if (this.defaultBuilder.getQueryClass() != null && !this.defaultBuilder.getQueryClass().equals(this.referenceClass)){
                this.defaultBuilder = new ExpressionBuilder();
            }
            return;

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     * 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();
        }
    }

View Full Code Here

     * Initialize the expression builder which should be used for this query. If
     * there is a where clause, use its expression builder, otherwise
     * generate one and cache it. This helps avoid unnecessary rebuilds.
     */
    protected void initializeDefaultBuilder() {
        DatabaseQueryMechanism mech = getQueryMechanism();
        if (mech.isExpressionQueryMechanism() && ((ExpressionQueryMechanism)mech).getExpressionBuilder() != null) {
            this.defaultBuilder = ((ExpressionQueryMechanism)mech).getExpressionBuilder();
            if (this.defaultBuilder.getQueryClass() != null && !this.defaultBuilder.getQueryClass().equals(this.referenceClass)){
                this.defaultBuilder = new ExpressionBuilder();
            }
            return;

View Full Code Here

     * 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();
        }
    }

View Full Code Here

     * Initialize the expression builder which should be used for this query. If
     * there is a where clause, use its expression builder, otherwise
     * generate one and cache it. This helps avoid unnecessary rebuilds.
     */
    protected void initializeDefaultBuilder() {
        DatabaseQueryMechanism mech = getQueryMechanism();
        if (mech.isExpressionQueryMechanism() && ((ExpressionQueryMechanism)mech).getExpressionBuilder() != null) {
            this.defaultBuilder = ((ExpressionQueryMechanism)mech).getExpressionBuilder();
            if (this.defaultBuilder.getQueryClass() != null && !this.defaultBuilder.getQueryClass().equals(this.referenceClass)){
                this.defaultBuilder = new ExpressionBuilder();
            }
            return;

View Full Code Here

     * 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();
        }
    }

View Full Code Here

     * 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();
        }
    }

View Full Code Here

     * 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();
        }
    }

View Full Code Here

     * Initialize the expression builder which should be used for this query. If
     * there is a where clause, use its expression builder, otherwise
     * generate one and cache it. This helps avoid unnecessary rebuilds.
     */
    protected void initializeDefaultBuilder() {
        DatabaseQueryMechanism mech = getQueryMechanism();
        if (mech.isExpressionQueryMechanism() && ((ExpressionQueryMechanism)mech).getExpressionBuilder() != null) {
            this.defaultBuilder = ((ExpressionQueryMechanism)mech).getExpressionBuilder();
            if (this.defaultBuilder.getQueryClass() != null && !this.defaultBuilder.getQueryClass().equals(this.referenceClass)){
                this.defaultBuilder = new ExpressionBuilder();
            }
            return;

View Full Code Here

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