protected override IBuildContext BuildMethodCall(ExpressionBuilder builder, MethodCallExpression methodCall, BuildInfo buildInfo)
{
var sequence = builder.BuildSequence(new BuildInfo(buildInfo, methodCall.Arguments[0]));
var query = builder.BuildSequence(new BuildInfo(buildInfo, methodCall.Arguments[1], new SqlQuery()));
var except = query.SqlQuery;
sequence = new SubQueryContext(sequence);
var sql = sequence.SqlQuery;
except.ParentSql = sql;
if (methodCall.Method.Name == "Except")
sql.Where.Not.Exists(except);
else
sql.Where.Exists(except);
var keys1 = sequence.ConvertToSql(null, 0, ConvertFlags.Key);
var keys2 = query. ConvertToSql(null, 0, ConvertFlags.Key);
if (keys1.Length != keys2.Length)
throw new InvalidOperationException();
for (var i = 0; i < keys1.Length; i++)
{
except.Where
.Expr(keys1[i].Sql)
.Equal
.Expr(keys2[i].Sql);
}
return sequence;
}
protected override IBuildContext BuildMethodCall(ExpressionBuilder builder, MethodCallExpression methodCall, BuildInfo buildInfo)
{
var sequence = builder.BuildSequence(new BuildInfo(buildInfo, methodCall.Arguments[0]));
if (sequence.SelectQuery.Select.TakeValue != null || sequence.SelectQuery.Select.SkipValue != null)
sequence = new SubQueryContext(sequence);
var lambda = (LambdaExpression)methodCall.Arguments[1].Unwrap();
var sparent = sequence.Parent;
var order = new ExpressionContext(buildInfo.Parent, sequence, lambda);
var body = lambda.Body.Unwrap();
var sql = builder.ConvertExpressions(order, body, ConvertFlags.Key);
builder.ReplaceParent(order, sparent);
if (!methodCall.Method.Name.StartsWith("Then"))
sequence.SelectQuery.OrderBy.Items.Clear();
foreach (var expr in sql)
{
var e = builder.ConvertSearchCondition(sequence, expr.Sql);
sequence.SelectQuery.OrderBy.Expr(e, methodCall.Method.Name.EndsWith("Descending"));
}
return sequence;
}
protected override IParseContext ParseMethodCall(ExpressionParser parser, IParseContext parent, MethodCallExpression methodCall, SqlQuery sqlQuery)
{
var sequence = parser.ParseSequence(parent, methodCall.Arguments[0], sqlQuery);
var sql = sequence.SqlQuery;
if (sql.Select.TakeValue != null || sql.Select.SkipValue != null)
sequence = new SubQueryContext(sequence);
sequence.SqlQuery.Select.IsDistinct = true;
return sequence;
}
protected override IBuildContext BuildMethodCall(ExpressionBuilder builder, MethodCallExpression methodCall, BuildInfo buildInfo)
{
var sequence = builder.BuildSequence(new BuildInfo(buildInfo, methodCall.Arguments[0]));
var sql = sequence.SqlQuery;
if (sql.Select.TakeValue != null || sql.Select.SkipValue != null)
sequence = new SubQueryContext(sequence);
sequence.SqlQuery.Select.IsDistinct = true;
sequence.ConvertToIndex(null, 0, ConvertFlags.All);
return sequence;
}
public IParseContext ParseWhere(IParseContext sequence, LambdaExpression condition, bool checkForSubQuery)
{
var makeHaving = false;
var ctx = new PathThroughContext(sequence, condition);
var expr = condition.Body.Unwrap();
if (checkForSubQuery && CheckSubQueryForWhere(ctx, expr, out makeHaving))
{
sequence = new SubQueryContext(sequence);
ctx = new PathThroughContext(sequence, condition);
}
ParseSearchCondition(
ctx,
expr,
makeHaving ?
ctx.SqlQuery.Having.SearchCondition.Conditions :
ctx.SqlQuery.Where. SearchCondition.Conditions);
return sequence;
}
protected override IParseContext ParseMethodCall(ExpressionParser parser, IParseContext parent, MethodCallExpression methodCall, SqlQuery sqlQuery)
{
var sequence = parser.ParseSequence(parent, methodCall.Arguments[0], sqlQuery);
if (sequence.SqlQuery.Select.TakeValue != null || sequence.SqlQuery.Select.SkipValue != null)
sequence = new SubQueryContext(sequence);
var lambda = (LambdaExpression)methodCall.Arguments[1].Unwrap();
var order = new PathThroughContext(sequence, lambda);
var body = lambda.Body.Unwrap();
var sql = parser.ParseExpressions(order, body, ConvertFlags.Key);
if (!methodCall.Method.Name.StartsWith("Then"))
sequence.SqlQuery.OrderBy.Items.Clear();
foreach (var expr in sql)
{
var e = expr.Sql;
if (e is SqlQuery.SearchCondition)
{
if (e.CanBeNull())
{
var notExpr = new SqlQuery.SearchCondition
{
Conditions = { new SqlQuery.Condition(true, new SqlQuery.Predicate.Expr(e, e.Precedence)) }
};
e = parser.Convert(sequence, new SqlFunction(e.SystemType, "CASE", e, new SqlValue(1), notExpr, new SqlValue(0), new SqlValue(null)));
}
else
e = parser.Convert(sequence, new SqlFunction(e.SystemType, "CASE", e, new SqlValue(1), new SqlValue(0)));
}
sequence.SqlQuery.OrderBy.Expr(e, methodCall.Method.Name.EndsWith("Descending"));
}
return sequence;
}
protected override IParseContext ParseMethodCall(ExpressionParser parser, IParseContext parent, MethodCallExpression methodCall, SqlQuery sqlQuery)
{
var isGroup = methodCall.Method.Name == "GroupJoin";
var outerContext = parser.ParseSequence(parent, methodCall.Arguments[0], sqlQuery);
var innerContext = parser.ParseSequence(parent, methodCall.Arguments[1], new SqlQuery());
outerContext = new SubQueryContext(outerContext);
innerContext = new SubQueryContext(innerContext);
var join = innerContext.SqlQuery.InnerJoin();
var sql = new SqlQuery();
sql.From.Table(outerContext.SqlQuery, join);
var selector = (LambdaExpression)methodCall.Arguments[4].Unwrap();
outerContext.SetAlias(selector.Parameters[0].Name);
innerContext.SetAlias(selector.Parameters[1].Name);
var outerKeyLambda = ((LambdaExpression)methodCall.Arguments[2].Unwrap());
var innerKeyLambda = ((LambdaExpression)methodCall.Arguments[3].Unwrap());
var outerKeySelector = outerKeyLambda.Body.Unwrap();
var innerKeySelector = innerKeyLambda.Body.Unwrap();
var outerKeyContext = new PathThroughContext(outerContext, outerKeyLambda);
var innerKeyContext = new PathThroughContext(innerContext, innerKeyLambda);
if (outerKeySelector.NodeType == ExpressionType.New)
{
var new1 = (NewExpression)outerKeySelector;
var new2 = (NewExpression)innerKeySelector;
for (var i = 0; i < new1.Arguments.Count; i++)
{
var arg1 = new1.Arguments[i];
var arg2 = new2.Arguments[i];
var predicate = parser.ParseObjectComparison(ExpressionType.Equal, outerKeyContext, arg1, innerKeyContext, arg2);
if (predicate != null)
join.JoinedTable.Condition.Conditions.Add(new SqlQuery.Condition(false, predicate));
else
join
.Expr(parser.ParseExpression(outerKeyContext, arg1)).Equal
.Expr(parser.ParseExpression(innerKeyContext, arg2));
}
}
else if (outerKeySelector.NodeType == ExpressionType.MemberInit)
{
var mi1 = (MemberInitExpression)outerKeySelector;
var mi2 = (MemberInitExpression)innerKeySelector;
for (var i = 0; i < mi1.Bindings.Count; i++)
{
if (mi1.Bindings[i].Member != mi2.Bindings[i].Member)
throw new LinqException(string.Format("List of member inits does not match for entity type '{0}'.", outerKeySelector.Type));
var arg1 = ((MemberAssignment)mi1.Bindings[i]).Expression;
var arg2 = ((MemberAssignment)mi2.Bindings[i]).Expression;
var predicate = parser.ParseObjectComparison(ExpressionType.Equal, outerKeyContext, arg1, innerKeyContext, arg2);
if (predicate != null)
join.JoinedTable.Condition.Conditions.Add(new SqlQuery.Condition(false, predicate));
else
join
.Expr(parser.ParseExpression(outerKeyContext, arg1)).Equal
.Expr(parser.ParseExpression(innerKeyContext, arg2));
}
}
else
{
var predicate = parser.ParseObjectComparison(
ExpressionType.Equal,
outerKeyContext, outerKeySelector,
innerKeyContext, innerKeySelector);
if (predicate != null)
join.JoinedTable.Condition.Conditions.Add(new SqlQuery.Condition(false, predicate));
else
join
.Expr(parser.ParseExpression(outerKeyContext, outerKeySelector)).Equal
.Expr(parser.ParseExpression(innerKeyContext, innerKeySelector));
}
return isGroup ?
new GroupJoinContext(selector, outerContext, innerContext, sql) :
new JoinContext(selector, outerContext, innerContext, sql);
}