Examples with AggregateTemporalExpression org.datanucleus.store.rdbms.sql.expression.AggregateTemporalExpression used on opensource projects

Example 1 with AggregateTemporalExpression

use of org.datanucleus.store.rdbms.sql.expression.AggregateTemporalExpression in project datanucleus-rdbms by datanucleus.

the class SimpleOrderableAggregateMethod method getExpression.

/* (non-Javadoc)
     * @see org.datanucleus.store.rdbms.sql.method.SQLMethod#getExpression(org.datanucleus.store.rdbms.sql.expression.SQLExpression, java.util.List)
     */
public SQLExpression getExpression(SQLStatement stmt, SQLExpression expr, List<SQLExpression> args) {
    if (expr != null) {
        throw new NucleusException(Localiser.msg("060002", getFunctionName(), expr));
    } else if (args == null || args.size() != 1) {
        throw new NucleusException(getFunctionName() + " is only supported with a single argument");
    }
    if (stmt.getQueryGenerator().getCompilationComponent() == CompilationComponent.RESULT || stmt.getQueryGenerator().getCompilationComponent() == CompilationComponent.HAVING) {
        // FUNC(argExpr)
        // Use same java type as the argument
        SQLExpression argExpr = args.get(0);
        JavaTypeMapping m = argExpr.getJavaTypeMapping();
        if (argExpr instanceof TemporalExpression) {
            return new AggregateTemporalExpression(stmt, m, getFunctionName(), args);
        } else if (argExpr instanceof StringExpression) {
            return new AggregateStringExpression(stmt, m, getFunctionName(), args);
        }
        return new AggregateNumericExpression(stmt, m, getFunctionName(), args);
    }
    // Handle as Subquery "SELECT AVG(expr) FROM tbl"
    SQLExpressionFactory exprFactory = stmt.getSQLExpressionFactory();
    ClassLoaderResolver clr = stmt.getQueryGenerator().getClassLoaderResolver();
    SQLExpression argExpr = args.get(0);
    SelectStatement subStmt = new SelectStatement(stmt, stmt.getRDBMSManager(), argExpr.getSQLTable().getTable(), argExpr.getSQLTable().getAlias(), null);
    subStmt.setClassLoaderResolver(clr);
    JavaTypeMapping mapping = stmt.getRDBMSManager().getMappingManager().getMappingWithDatastoreMapping(String.class, false, false, clr);
    String aggregateString = getFunctionName() + "(" + argExpr.toSQLText() + ")";
    SQLExpression aggExpr = exprFactory.newLiteral(subStmt, mapping, aggregateString);
    ((StringLiteral) aggExpr).generateStatementWithoutQuotes();
    subStmt.select(aggExpr, null);
    JavaTypeMapping subqMapping = exprFactory.getMappingForType(Integer.class, false);
    SQLExpression subqExpr = null;
    if (argExpr instanceof TemporalExpression) {
        subqExpr = new TemporalSubqueryExpression(stmt, subStmt);
    } else if (argExpr instanceof StringExpression) {
        subqExpr = new StringSubqueryExpression(stmt, subStmt);
    } else {
        subqExpr = new NumericSubqueryExpression(stmt, subStmt);
    }
    subqExpr.setJavaTypeMapping(subqMapping);
    return subqExpr;
}