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

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

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

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     * This method returns the query to select the timestamp from the server
     * for Derby.
     */
    public ValueReadQuery getTimestampQuery() {
        if (timestampQuery == null) {
            timestampQuery = new ValueReadQuery();
            timestampQuery.setSQLString("SELECT NOW()");
        }
        return timestampQuery;


    }

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     * the returned query used until the sequence is disconnected.
     * If the platform supportsIdentity then (at least) one of buildSelectQueryForIdentity
     * methods should return non-null query.
     */
    public ValueReadQuery buildSelectQueryForIdentity() {
        ValueReadQuery selectQuery = new ValueReadQuery(); 
        selectQuery.setSQLString("select lastval()"); 
        return selectQuery;
    }

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    /**
     * INTERNAL:
     * Build the identity query for native sequencing.
     */
    public ValueReadQuery buildSelectQueryForIdentity() {
        ValueReadQuery selectQuery = new ValueReadQuery();
        StringWriter writer = new StringWriter();
        writer.write("SELECT @@IDENTITY");
        selectQuery.setSQLString(writer.toString());
        return selectQuery;
    }

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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");
        }
        return timestampQuery;
    }

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    /**
     * INTERNAL:
     * Build the identity query for native sequencing.
     */
    public ValueReadQuery buildSelectQueryForIdentity() {
        ValueReadQuery selectQuery = new ValueReadQuery();
        StringWriter writer = new StringWriter();
        writer.write("SELECT LAST_INSERT_ID()");
        selectQuery.setSQLString(writer.toString());
        return selectQuery;
    }

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     * This method returns the query to select the timestamp
     * from the server for MySQL.
     */
    public ValueReadQuery getTimestampQuery() {
        if (timestampQuery == null) {
            timestampQuery = new ValueReadQuery();
            timestampQuery.setSQLString("SELECT NOW()");
        }
        return timestampQuery;
    }

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     * @return ValueReadQuery class to perform a read of a single data value.
     */
    @Override
    public ValueReadQuery buildSelectQueryForSequenceObject(String seqName,
            Integer size) {
        return new ValueReadQuery("SELECT " + getQualifiedName(seqName)
                + ".NEXTVAL FROM RDBII_SYSTEM.RDBII_ASSISTTABLE");
    }

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     * from the database.
     */
    @Override
    public ValueReadQuery getTimestampQuery() {
        if (timestampQuery == null) {
            timestampQuery = new ValueReadQuery();
            timestampQuery.setSQLString("SELECT CURRENT_TIMESTAMP FROM RDBII_SYSTEM.RDBII_ASSISTTABLE");
        }
        return timestampQuery;
    }

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