/// <summary>
/// Translates the <paramref name="joinExpression"/> into a string representation.
/// </summary>
/// <param name="joinExpression">The <see cref="DbJoinExpression"/> to translate.</param>
/// <returns><see cref="string"/></returns>
protected override DbExpression VisitJoinExpression(DbJoinExpression joinExpression)
{
string body;
switch (joinExpression.JoinExpressionType)
{
case DbJoinExpressionType.InnerJoin:
body = "INNER JOIN {0} ON {1}";
break;
case DbJoinExpressionType.LeftOuterJoin:
body = "LEFT OUTER JOIN {0} ON {1}";
break;
case DbJoinExpressionType.RightOuterJoin:
body = "RIGHT OUTER JOIN {0} ON {1}";
break;
default:
throw new ArgumentOutOfRangeException("joinExpression",
string.Format(
"The JoinExpressionType '{0}' is not supported",
joinExpression.JoinExpressionType));
}
string syntax = string.Format(body, Visit(joinExpression.Target), Visit(joinExpression.Condition));
return(ExpressionFactory.Sql(syntax));
}
/// <summary>
/// Translates the <paramref name="joinExpression"/> into a string representation.
/// </summary>
/// <param name="joinExpression">The <see cref="DbJoinExpression"/> to translate.</param>
/// <returns><see cref="DbExpression"/></returns>
protected virtual DbExpression VisitJoinExpression(DbJoinExpression joinExpression)
{
var conditionExpression = Visit(joinExpression.Condition);
var targetExpression = Visit(joinExpression.Target);
if (!ReferenceEquals(conditionExpression, joinExpression.Condition) ||
!ReferenceEquals(targetExpression, joinExpression.Target))
{
return(ExpressionFactory.MakeJoin(joinExpression.JoinExpressionType, targetExpression,
conditionExpression));
}
return(joinExpression);
}
/// <summary>
/// Creates a new <see cref="DbJoinExpression"/>.
/// </summary>
/// <param name="joinType">The <see cref="DbJoinExpressionType"/> that specifies the type of join to create.</param>
/// <param name="target">The join target.</param>
/// <param name="condition">The join condition.</param>
/// <returns>A <see cref="DbJoinExpression"/> instance.</returns>
public DbJoinExpression MakeJoin(DbJoinExpressionType joinType, DbExpression target, DbExpression condition)
{
var joinExpression = new DbJoinExpression(joinType, target, condition);
return joinExpression;
}
/// <summary>
/// Translates the <paramref name="joinExpression"/> into a string representation.
/// </summary>
/// <param name="joinExpression">The <see cref="DbJoinExpression"/> to translate.</param>
/// <returns><see cref="string"/></returns>
protected override DbExpression VisitJoinExpression(DbJoinExpression joinExpression)
{
string body;
switch (joinExpression.JoinExpressionType)
{
case DbJoinExpressionType.InnerJoin:
body = "INNER JOIN {0} ON {1}";
break;
case DbJoinExpressionType.LeftOuterJoin:
body = "LEFT OUTER JOIN {0} ON {1}";
break;
case DbJoinExpressionType.RightOuterJoin:
body = "RIGHT OUTER JOIN {0} ON {1}";
break;
default:
throw new ArgumentOutOfRangeException("joinExpression",
string.Format(
"The JoinExpressionType '{0}' is not supported",
joinExpression.JoinExpressionType));
}
string syntax = string.Format(body, Visit(joinExpression.Target), Visit(joinExpression.Condition));
return ExpressionFactory.Sql(syntax);
}
/// <summary>
/// Translates the <paramref name="joinExpression"/> into a string representation.
/// </summary>
/// <param name="joinExpression">The <see cref="DbJoinExpression"/> to translate.</param>
/// <returns><see cref="DbExpression"/></returns>
protected virtual DbExpression VisitJoinExpression(DbJoinExpression joinExpression)
{
var conditionExpression = Visit(joinExpression.Condition);
var targetExpression = Visit(joinExpression.Target);
if (!ReferenceEquals(conditionExpression,joinExpression.Condition) ||
!ReferenceEquals(targetExpression,joinExpression.Target))
{
return ExpressionFactory.MakeJoin(joinExpression.JoinExpressionType, targetExpression,
conditionExpression);
}
return joinExpression;
}
