querydsl/querydsl-sql/src/main/java/com/mysema/query/sql/PostgresTemplates.java

/*
 * Copyright (c) 2010 Mysema Ltd.
 * All rights reserved.
 * 
 */
package com.mysema.query.sql;

import com.mysema.query.types.operation.Ops;
import com.mysema.query.types.path.PathType;

/**
 * PostgresTemplates is an SQL dialect for Postgres
 * 
 * tested with Postgres 8.4
 * 
 * @author tiwe
 *
 */
public class PostgresTemplates extends SQLTemplates{
    
    public PostgresTemplates(){
        this(false);
    }
    
    public PostgresTemplates(boolean quote){
        super(quote ? "\"" : null);
        // type mappings
        addClass2TypeMappings("numeric(3,0)", Byte.class);
        addClass2TypeMappings("double precision", Double.class);
        
        // String
        add(Ops.CONCAT, "{0} || {1}");
        add(Ops.MATCHES, "{0} ~ {1}");
        add(Ops.INDEX_OF, "strpos({0},{1})-1");
        add(Ops.INDEX_OF_2ARGS, "strpos({0},{1})-1"); //FIXME
        
        // Number
        add(Ops.MathOps.RANDOM, "random()");
        add(Ops.MathOps.LOG, "ln({0})");
        add(Ops.MathOps.LOG10, "log({0})");
        
        // Date / time
        add(Ops.DateTimeOps.YEAR, "extract(year from {0})");
        add(Ops.DateTimeOps.YEAR_MONTH, "extract(year from {0}) * 100 + extract(month from {0})");
        add(Ops.DateTimeOps.MONTH, "extract(month from {0})");        
        add(Ops.DateTimeOps.WEEK, "extract(week from {0})");        
        add(Ops.DateTimeOps.DAY_OF_MONTH, "extract(day from {0})");
        add(Ops.DateTimeOps.DAY_OF_WEEK, "extract(dow from {0}) + 1");
        add(Ops.DateTimeOps.DAY_OF_YEAR, "extract(doy from {0})");
        add(Ops.DateTimeOps.HOUR, "extract(hour from {0})");
        add(Ops.DateTimeOps.MINUTE, "extract(minute from {0})");
        add(Ops.DateTimeOps.SECOND, "extract(second from {0})");
        
//        if (quote){
//            add(PathType.PROPERTY, "{0}.\"{1s}\"");
//            add(PathType.VARIABLE, "\"{0s}\"");            
//        }
    }
        
}