Examples of org.eclipse.persistence.queries.ValueReadQuery

org.eclipse.persistence.queries.ValueReadQuery

Purpose: Concrete class to perform a read of a single data value.

Responsibilities: Used in conjunction with CursoredStream size and Platform getSequence. This can be used to read a single data value (i.e. one field). A single data value is returned, or null if no rows are returned. @author James Sutherland @since TOPLink/Java 1.2

     * This method returns the query to select the SYSTIMESTAMP as TIMESTAMPTZ
     * from the server for Oracle9i.
     */
    public ValueReadQuery getTimestampQuery() {
        if (timestampQuery == null) {
            timestampQuery = new ValueReadQuery();
            timestampQuery.setSQLString("SELECT SYSTIMESTAMP FROM DUAL");
        }
        return timestampQuery;
    }

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     * This method returns the query to select the SYSTIMESTAMP as TIMESTAMPTZ
     * from the server for Oracle9i.
     */
    public ValueReadQuery getTimestampQuery() {
        if (timestampQuery == null) {
            timestampQuery = new ValueReadQuery();
            timestampQuery.setSQLString("SELECT SYSTIMESTAMP FROM DUAL");
            timestampQuery.setAllowNativeSQLQuery(true);
        }
        return timestampQuery;
    }

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        return true;
    }


    @Override
    public ValueReadQuery buildSelectQueryForIdentity() {
        return new ValueReadQuery("CALL IDENTITY()");
    }

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        return true;
    }


    @Override
    public ValueReadQuery buildSelectQueryForSequenceObject(String seqName, Integer size) {
        return new ValueReadQuery(new StringBuilder(20 + seqName.length()).append("CALL NEXT VALUE FOR ").append(seqName).toString());
    }

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    }


    @Override
    public ValueReadQuery getTimestampQuery() {
        if (this.timestampQuery == null) {
            this.timestampQuery = new ValueReadQuery();
            this.timestampQuery.setSQLString("CALL CURRENT_TIMESTAMP");
            this.timestampQuery.setAllowNativeSQLQuery(true);
        }
        return this.timestampQuery;
    }

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     * from Oracle.
     * In order to execute this query a database administrator may need
     * to grant execute permission on pl/sql package DBMS_FLASHBACK.
     */
    public ValueReadQuery getSystemChangeNumberQuery() {
        ValueReadQuery sCNQuery = new ValueReadQuery();
        sCNQuery.setSQLString("SELECT DBMS_FLASHBACK.GET_SYSTEM_CHANGE_NUMBER FROM DUAL");
        return sCNQuery;
    }

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     * This method returns the query to select the timestamp
     * from the server for Oracle.
     */
    public ValueReadQuery getTimestampQuery() {
        if (timestampQuery == null) {
            timestampQuery = new ValueReadQuery();
            timestampQuery.setSQLString("SELECT SYSDATE FROM DUAL");
            timestampQuery.setAllowNativeSQLQuery(true);
        }
        return timestampQuery;
    }

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     * Produce a DataReadQuery which updates(!) the sequence number in the db
     * and returns it. Currently implemented on Oracle only.
     * @param qualifiedSeqName known by Oracle to be a defined sequence
     */
    public ValueReadQuery buildSelectQueryForSequenceObject(String qualifiedSeqName, Integer size) {
        return new ValueReadQuery("SELECT " + qualifiedSeqName + ".NEXTVAL FROM DUAL");
    }

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     * Though Oracle doesn't support identity it could be imitated,
     * see comment to setSupportsIdentity method.
     * @param qualifiedSeqName known by Oracle to be a defined sequence
     */
    public ValueReadQuery buildSelectQueryForIdentity(String qualifiedSeqName, Integer size) {
        return new ValueReadQuery("SELECT " + qualifiedSeqName + ".CURRVAL FROM DUAL");
    }

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                    // data-read query
                    databaseQueryToInitialize = new DataReadQuery();
                }
                else if (!xrService.descriptorsByQName.containsKey(type)) {
                    // value read query
                    databaseQueryToInitialize = new ValueReadQuery();
                }
                else {
                    // read object query for the class mapped to the type
                    databaseQueryToInitialize = new ReadObjectQuery(xrService.getTypeClass(type));
                }

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