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

    
  /**
   * 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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        return true;
    }
    
    @Override
    public final ValueReadQuery buildSelectQueryForSequenceObject(final String sequenceName, final Integer size) {
        return new ValueReadQuery("SELECT " + this.getQualifiedSequenceName(sequenceName) + ".NEXTVAL FROM DUAL");
    }

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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");
        }
        return this.timestampQuery;
    }

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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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        return true;
    }


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

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    }


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

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    }
    
    @Override
    public ValueReadQuery getTimestampQuery() {
        if (this.timestampQuery == null) {
            this.timestampQuery = new ValueReadQuery("SELECT CURRENT_TIMESTAMP FROM RDB$DATABASE");
        }
        return this.timestampQuery;
    }

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        builder.append("SELECT GEN_ID(");
        builder.append(seqName);
        builder.append(", ");
        builder.append(size);
        builder.append(") FROM RDB$DATABASE");
        return new ValueReadQuery(builder.toString());
    }

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