public override void Visit(SqlBinaryExpression expression)
{
bool useParentheses = expression.Operator == SqlBinaryOperator.And ||
expression.Operator == SqlBinaryOperator.Or;
// TODO: The accept code should be in the class itself.
if (useParentheses)
{
_writer.WriteOpenParenthesis();
}
expression.Left.Accept(this);
if (useParentheses)
{
_writer.WriteCloseParenthesis();
}
expression.Operator.Accept(this);
if (useParentheses)
{
_writer.WriteOpenParenthesis();
}
expression.Right.Accept(this);
if (useParentheses)
{
_writer.WriteCloseParenthesis();
}
}
/// <summary>
/// Creates a <see cref="SqlBinaryExpression"/> that represents a logical <b>AND</b> operation.
/// </summary>
/// <param name="left">
/// A <see cref="SqlBinaryExpression"/> to use as the left operand in the expression.
/// </param>
/// <param name="right">
/// A <see cref="SqlBinaryExpression"/> to use as the right operand in the expression.
/// </param>
/// <returns>
/// A <see cref="SqlBinaryExpression"/> that represents a logical <b>AND</b> operation between
/// the specified <paramref name="left"/> and <paramref name="right"/> operands.
/// </returns>
public static SqlBinaryExpression And(SqlBinaryExpression left, SqlBinaryExpression right)
{
return new SqlBinaryExpression(left, SqlBinaryOperator.And, right);
}
/// <summary>
/// Creates a <see cref="SqlBinaryExpression"/> that represents a logical <b>OR</b> operation.
/// </summary>
/// <param name="left">
/// A <see cref="SqlBinaryExpression"/> to use as the left operand in the expression.
/// </param>
/// <param name="right">
/// A <see cref="SqlBinaryExpression"/> to use as the right operand in the expression.
/// </param>
/// <returns>
/// A <see cref="SqlBinaryExpression"/> that represents a logical <b>OR</b> operation between
/// the specified <paramref name="left"/> and <paramref name="right"/> operands.
/// </returns>
public static SqlBinaryExpression Or(SqlBinaryExpression left, SqlBinaryExpression right)
{
return(new SqlBinaryExpression(left, SqlBinaryOperator.Or, right));
}
protected override SqlExpression VisitBinary(SqlBinaryExpression expression)
{
switch (expression.Operator)
{
case SqlBinaryOperator.And:
case SqlBinaryOperator.Or:
_writer.WriteOpenParenthesis();
Visit(expression.Left);
break;
default:
Visit(expression.Left);
break;
}
_writer.WriteOperator(expression.Operator);
switch (expression.Operator)
{
case SqlBinaryOperator.And:
case SqlBinaryOperator.Or:
Visit(expression.Right);
_writer.WriteCloseParenthesis();
break;
default:
Visit(expression.Right);
break;
}
return expression;
}