protected override void BuildSql(StringBuilder sb)
{
if (NeedSkip)
{
AlternativeBuildSql2(sb, base.BuildSql);
return;
}
if (SqlQuery.From.Tables.Count == 0 && SqlQuery.Select.Columns.Count == 1 && SqlQuery.Select.Columns[0].Expression is SqlFunction)
{
SqlFunction func = (SqlFunction)SqlQuery.Select.Columns[0].Expression;
if (func.Name == "Iif" && func.Parameters.Length == 3 && func.Parameters[0] is SqlQuery.SearchCondition)
{
SqlQuery.SearchCondition sc = (SqlQuery.SearchCondition)func.Parameters[0];
if (sc.Conditions.Count == 1 && sc.Conditions[0].Predicate is SqlQuery.Predicate.FuncLike)
{
SqlQuery.Predicate.FuncLike p = (SqlQuery.Predicate.FuncLike)sc.Conditions[0].Predicate;
if (p.Function.Name == "EXISTS")
{
BuildAnyAsCount(sb);
return;
}
}
}
}
base.BuildSql(sb);
}
IQueryElement ConvertInternal(IQueryElement element, ConvertFunc action)
{
if (element == null)
{
return(null);
}
IQueryElement newElement;
if (_visitedElements.TryGetValue(element, out newElement))
{
return(newElement);
}
switch (element.ElementType)
{
case QueryElementType.SqlFunction:
{
var func = (SqlFunction)element;
var parms = Convert(func.Parameters, action);
if (parms != null && !ReferenceEquals(parms, func.Parameters))
{
newElement = new SqlFunction(func.SystemType, func.Name, func.Precedence, parms);
}
break;
}
case QueryElementType.SqlExpression:
{
var expr = (SqlExpression)element;
var parameter = Convert(expr.Parameters, action);
if (parameter != null && !ReferenceEquals(parameter, expr.Parameters))
{
newElement = new SqlExpression(expr.SystemType, expr.Expr, expr.Precedence, parameter);
}
break;
}
case QueryElementType.SqlBinaryExpression:
{
var bexpr = (SqlBinaryExpression)element;
var expr1 = (ISqlExpression)ConvertInternal(bexpr.Expr1, action);
var expr2 = (ISqlExpression)ConvertInternal(bexpr.Expr2, action);
if (expr1 != null && !ReferenceEquals(expr1, bexpr.Expr1) ||
expr2 != null && !ReferenceEquals(expr2, bexpr.Expr2))
{
newElement = new SqlBinaryExpression(bexpr.SystemType, expr1 ?? bexpr.Expr1, bexpr.Operation, expr2 ?? bexpr.Expr2, bexpr.Precedence);
}
break;
}
case QueryElementType.SqlTable:
{
var table = (SqlTable)element;
var fields1 = ToArray(table.Fields);
var fields2 = Convert(fields1, action, f => new SqlField(f));
var joins = Convert(table.Joins, action, j => j.Clone());
var targs = table.TableArguments == null ? null : Convert(table.TableArguments, action);
var fe = fields2 == null || ReferenceEquals(fields1, fields2);
var je = joins == null || ReferenceEquals(table.Joins, joins);
var ta = ReferenceEquals(table.TableArguments, targs);
if (!fe || !je || !ta)
{
if (fe)
{
fields2 = fields1;
for (var i = 0; i < fields2.Length; i++)
{
var field = fields2[i];
fields2[i] = new SqlField(field);
_visitedElements[field] = fields2[i];
}
}
newElement = new SqlTable(table, fields2, joins ?? table.Joins, targs ?? table.TableArguments);
_visitedElements[((SqlTable)newElement).All] = table.All;
}
break;
}
case QueryElementType.Join:
{
var join = (Join)element;
var ons = Convert(join.JoinOns, action);
if (ons != null && !ReferenceEquals(join.JoinOns, ons))
{
newElement = new Join(join.TableName, join.Alias, ons);
}
break;
}
case QueryElementType.Column:
{
var col = (SqlQuery.Column)element;
var expr = (ISqlExpression)ConvertInternal(col.Expression, action);
IQueryElement parent;
_visitedElements.TryGetValue(col.Parent, out parent);
if (parent != null || expr != null && !ReferenceEquals(expr, col.Expression))
{
newElement = new SqlQuery.Column(parent == null ? col.Parent : (SqlQuery)parent, expr ?? col.Expression, col._alias);
}
break;
}
case QueryElementType.TableSource:
{
var table = (SqlQuery.TableSource)element;
var source = (ISqlTableSource)ConvertInternal(table.Source, action);
var joins = Convert(table.Joins, action);
if (source != null && !ReferenceEquals(source, table.Source) ||
joins != null && !ReferenceEquals(table.Joins, joins))
{
newElement = new SqlQuery.TableSource(source ?? table.Source, table._alias, joins ?? table.Joins);
}
break;
}
case QueryElementType.JoinedTable:
{
var join = (SqlQuery.JoinedTable)element;
var table = (SqlQuery.TableSource)ConvertInternal(join.Table, action);
var cond = (SqlQuery.SearchCondition)ConvertInternal(join.Condition, action);
if (table != null && !ReferenceEquals(table, join.Table) ||
cond != null && !ReferenceEquals(cond, join.Condition))
{
newElement = new SqlQuery.JoinedTable(join.JoinType, table ?? join.Table, join.IsWeak, cond ?? join.Condition);
}
break;
}
case QueryElementType.SearchCondition:
{
var sc = (SqlQuery.SearchCondition)element;
var conds = Convert(sc.Conditions, action);
if (conds != null && !ReferenceEquals(sc.Conditions, conds))
{
newElement = new SqlQuery.SearchCondition(conds);
}
break;
}
case QueryElementType.Condition:
{
var c = (SqlQuery.Condition)element;
var p = (ISqlPredicate)ConvertInternal(c.Predicate, action);
if (p != null && !ReferenceEquals(c.Predicate, p))
{
newElement = new SqlQuery.Condition(c.IsNot, p, c.IsOr);
}
break;
}
case QueryElementType.ExprPredicate:
{
var p = (SqlQuery.Predicate.Expr)element;
var e = (ISqlExpression)ConvertInternal(p.Expr1, action);
if (e != null && !ReferenceEquals(p.Expr1, e))
{
newElement = new SqlQuery.Predicate.Expr(e, p.Precedence);
}
break;
}
case QueryElementType.NotExprPredicate:
{
var p = (SqlQuery.Predicate.NotExpr)element;
var e = (ISqlExpression)ConvertInternal(p.Expr1, action);
if (e != null && !ReferenceEquals(p.Expr1, e))
{
newElement = new SqlQuery.Predicate.NotExpr(e, p.IsNot, p.Precedence);
}
break;
}
case QueryElementType.ExprExprPredicate:
{
var p = (SqlQuery.Predicate.ExprExpr)element;
var e1 = (ISqlExpression)ConvertInternal(p.Expr1, action);
var e2 = (ISqlExpression)ConvertInternal(p.Expr2, action);
if (e1 != null && !ReferenceEquals(p.Expr1, e1) || e2 != null && !ReferenceEquals(p.Expr2, e2))
{
newElement = new SqlQuery.Predicate.ExprExpr(e1 ?? p.Expr1, p.Operator, e2 ?? p.Expr2);
}
break;
}
case QueryElementType.LikePredicate:
{
var p = (SqlQuery.Predicate.Like)element;
var e1 = (ISqlExpression)ConvertInternal(p.Expr1, action);
var e2 = (ISqlExpression)ConvertInternal(p.Expr2, action);
var es = (ISqlExpression)ConvertInternal(p.Escape, action);
if (e1 != null && !ReferenceEquals(p.Expr1, e1) ||
e2 != null && !ReferenceEquals(p.Expr2, e2) ||
es != null && !ReferenceEquals(p.Escape, es))
{
newElement = new SqlQuery.Predicate.Like(e1 ?? p.Expr1, p.IsNot, e2 ?? p.Expr2, es ?? p.Escape);
}
break;
}
case QueryElementType.BetweenPredicate:
{
var p = (SqlQuery.Predicate.Between)element;
var e1 = (ISqlExpression)ConvertInternal(p.Expr1, action);
var e2 = (ISqlExpression)ConvertInternal(p.Expr2, action);
var e3 = (ISqlExpression)ConvertInternal(p.Expr3, action);
if (e1 != null && !ReferenceEquals(p.Expr1, e1) ||
e2 != null && !ReferenceEquals(p.Expr2, e2) ||
e3 != null && !ReferenceEquals(p.Expr3, e3))
{
newElement = new SqlQuery.Predicate.Between(e1 ?? p.Expr1, p.IsNot, e2 ?? p.Expr2, e3 ?? p.Expr3);
}
break;
}
case QueryElementType.IsNullPredicate:
{
var p = (SqlQuery.Predicate.IsNull)element;
var e = (ISqlExpression)ConvertInternal(p.Expr1, action);
if (e != null && !ReferenceEquals(p.Expr1, e))
{
newElement = new SqlQuery.Predicate.IsNull(e, p.IsNot);
}
break;
}
case QueryElementType.InSubQueryPredicate:
{
var p = (SqlQuery.Predicate.InSubQuery)element;
var e = (ISqlExpression)ConvertInternal(p.Expr1, action);
var q = (SqlQuery)ConvertInternal(p.SubQuery, action);
if (e != null && !ReferenceEquals(p.Expr1, e) || q != null && !ReferenceEquals(p.SubQuery, q))
{
newElement = new SqlQuery.Predicate.InSubQuery(e ?? p.Expr1, p.IsNot, q ?? p.SubQuery);
}
break;
}
case QueryElementType.InListPredicate:
{
var p = (SqlQuery.Predicate.InList)element;
var e = (ISqlExpression)ConvertInternal(p.Expr1, action);
var v = Convert(p.Values, action);
if (e != null && !ReferenceEquals(p.Expr1, e) || v != null && !ReferenceEquals(p.Values, v))
{
newElement = new SqlQuery.Predicate.InList(e ?? p.Expr1, p.IsNot, v ?? p.Values);
}
break;
}
case QueryElementType.FuncLikePredicate:
{
var p = (SqlQuery.Predicate.FuncLike)element;
var f = (SqlFunction)ConvertInternal(p.Function, action);
if (f != null && !ReferenceEquals(p.Function, f))
{
newElement = new SqlQuery.Predicate.FuncLike(f);
}
break;
}
case QueryElementType.SetExpression:
{
var s = (SqlQuery.SetExpression)element;
var c = (ISqlExpression)ConvertInternal(s.Column, action);
var e = (ISqlExpression)ConvertInternal(s.Expression, action);
if (c != null && !ReferenceEquals(s.Column, c) || e != null && !ReferenceEquals(s.Expression, e))
{
newElement = new SqlQuery.SetExpression(c ?? s.Column, e ?? s.Expression);
}
break;
}
case QueryElementType.SetClause:
{
var s = (SqlQuery.SetClause)element;
var t = s.Into != null ? (SqlTable)ConvertInternal(s.Into, action) : null;
var i = Convert(s.Items, action);
if (t != null && !ReferenceEquals(s.Into, t) || i != null && !ReferenceEquals(s.Items, i))
{
var sc = new SqlQuery.SetClause();
sc.Into = t ?? sc.Into;
sc.Items.AddRange(i ?? s.Items);
sc.WithIdentity = s.WithIdentity;
newElement = sc;
}
break;
}
case QueryElementType.SelectClause:
{
var sc = (SqlQuery.SelectClause)element;
var cols = Convert(sc.Columns, action);
var take = (ISqlExpression)ConvertInternal(sc.TakeValue, action);
var skip = (ISqlExpression)ConvertInternal(sc.SkipValue, action);
IQueryElement parent;
_visitedElements.TryGetValue(sc.SqlQuery, out parent);
if (parent != null ||
cols != null && !ReferenceEquals(sc.Columns, cols) ||
take != null && !ReferenceEquals(sc.TakeValue, take) ||
skip != null && !ReferenceEquals(sc.SkipValue, skip))
{
newElement = new SqlQuery.SelectClause(sc.IsDistinct, take ?? sc.TakeValue, skip ?? sc.SkipValue, cols ?? sc.Columns);
((SqlQuery.SelectClause)newElement).SetSqlQuery((SqlQuery)parent);
}
break;
}
case QueryElementType.FromClause:
{
var fc = (SqlQuery.FromClause)element;
var ts = Convert(fc.Tables, action);
IQueryElement parent;
_visitedElements.TryGetValue(fc.SqlQuery, out parent);
if (parent != null || ts != null && !ReferenceEquals(fc.Tables, ts))
{
newElement = new SqlQuery.FromClause(ts ?? fc.Tables);
((SqlQuery.FromClause)newElement).SetSqlQuery((SqlQuery)parent);
}
break;
}
case QueryElementType.WhereClause:
{
var wc = (SqlQuery.WhereClause)element;
var cond = (SqlQuery.SearchCondition)ConvertInternal(wc.SearchCondition, action);
IQueryElement parent;
_visitedElements.TryGetValue(wc.SqlQuery, out parent);
if (parent != null || cond != null && !ReferenceEquals(wc.SearchCondition, cond))
{
newElement = new SqlQuery.WhereClause(cond ?? wc.SearchCondition);
((SqlQuery.WhereClause)newElement).SetSqlQuery((SqlQuery)parent);
}
break;
}
case QueryElementType.GroupByClause:
{
var gc = (SqlQuery.GroupByClause)element;
var es = Convert(gc.Items, action);
IQueryElement parent;
_visitedElements.TryGetValue(gc.SqlQuery, out parent);
if (parent != null || es != null && !ReferenceEquals(gc.Items, es))
{
newElement = new SqlQuery.GroupByClause(es ?? gc.Items);
((SqlQuery.GroupByClause)newElement).SetSqlQuery((SqlQuery)parent);
}
break;
}
case QueryElementType.OrderByClause:
{
var oc = (SqlQuery.OrderByClause)element;
var es = Convert(oc.Items, action);
IQueryElement parent;
_visitedElements.TryGetValue(oc.SqlQuery, out parent);
if (parent != null || es != null && !ReferenceEquals(oc.Items, es))
{
newElement = new SqlQuery.OrderByClause(es ?? oc.Items);
((SqlQuery.OrderByClause)newElement).SetSqlQuery((SqlQuery)parent);
}
break;
}
case QueryElementType.OrderByItem:
{
var i = (SqlQuery.OrderByItem)element;
var e = (ISqlExpression)ConvertInternal(i.Expression, action);
if (e != null && !ReferenceEquals(i.Expression, e))
{
newElement = new SqlQuery.OrderByItem(e, i.IsDescending);
}
break;
}
case QueryElementType.Union:
{
var u = (SqlQuery.Union)element;
var q = (SqlQuery)ConvertInternal(u.SqlQuery, action);
if (q != null && !ReferenceEquals(u.SqlQuery, q))
{
newElement = new SqlQuery.Union(q, u.IsAll);
}
break;
}
case QueryElementType.SqlQuery:
{
var q = (SqlQuery)element;
IQueryElement parent = null;
var doConvert = q.ParentSql != null && !_visitedElements.TryGetValue(q.ParentSql, out parent);
if (!doConvert)
{
doConvert = null != Find(q, e =>
{
var ret = action(e);
if (ret != null && !ReferenceEquals(e, ret))
{
_visitedElements.Add(e, ret);
return(true);
}
return(false);
});
}
if (!doConvert)
{
break;
}
var nq = new SqlQuery {
QueryType = q.QueryType
};
_visitedElements.Add(q, nq);
var fc = (SqlQuery.FromClause)ConvertInternal(q.From, action) ?? q.From;
var sc = (SqlQuery.SelectClause)ConvertInternal(q.Select, action) ?? q.Select;
var tc = q.QueryType == QueryType.Update || q.QueryType == QueryType.Insert ? ((SqlQuery.SetClause)ConvertInternal(q.Set, action) ?? q.Set) : null;
var wc = (SqlQuery.WhereClause)ConvertInternal(q.Where, action) ?? q.Where;
var gc = (SqlQuery.GroupByClause)ConvertInternal(q.GroupBy, action) ?? q.GroupBy;
var hc = (SqlQuery.WhereClause)ConvertInternal(q.Having, action) ?? q.Having;
var oc = (SqlQuery.OrderByClause)ConvertInternal(q.OrderBy, action) ?? q.OrderBy;
var us = q.HasUnion ? Convert(q.Unions, action) : q.Unions;
var ps = new List <SqlParameter>(q.Parameters.Count);
foreach (var p in q.Parameters)
{
IQueryElement e;
if (_visitedElements.TryGetValue(p, out e))
{
if (e == null)
{
ps.Add(p);
}
else if (e is SqlParameter)
{
ps.Add((SqlParameter)e);
}
}
}
nq.Init(tc, sc, fc, wc, gc, hc, oc, us, (SqlQuery)parent, q.ParameterDependent, ps);
_visitedElements[q] = action(nq) ?? nq;
return(nq);
}
}
newElement = newElement == null?action(element) : (action(newElement) ?? newElement);
_visitedElements.Add(element, newElement);
return(newElement);
}
void Visit(IQueryElement element, bool all, VisitFunc action)
{
if (element == null || !all && _visitedElements.ContainsKey(element))
{
return;
}
switch (element.ElementType)
{
case QueryElementType.SqlFunction:
{
foreach (ISqlExpression p in ((SqlFunction)element).Parameters)
{
Visit(p, all, action);
}
break;
}
case QueryElementType.SqlExpression:
{
foreach (ISqlExpression v in ((SqlExpression)element).Parameters)
{
Visit(v, all, action);
}
break;
}
case QueryElementType.SqlBinaryExpression:
{
SqlBinaryExpression bexpr = (SqlBinaryExpression)element;
Visit(bexpr.Expr1, all, action);
Visit(bexpr.Expr2, all, action);
break;
}
case QueryElementType.SqlTable:
{
SqlTable table = (SqlTable)element;
Visit(table.All, all, action);
foreach (SqlField field in table.Fields.Values)
{
Visit(field, all, action);
}
foreach (Join join in table.Joins)
{
Visit(join, all, action);
}
break;
}
case QueryElementType.Join:
{
foreach (JoinOn j in ((Join)element).JoinOns)
{
Visit(j, all, action);
}
break;
}
case QueryElementType.Column:
{
Visit(((SqlQuery.Column)element).Expression, all, action);
break;
}
case QueryElementType.TableSource:
{
SqlQuery.TableSource table = (SqlQuery.TableSource)element;
Visit(table.Source, all, action);
foreach (SqlQuery.JoinedTable j in table.Joins)
{
Visit(j, all, action);
}
break;
}
case QueryElementType.JoinedTable:
{
SqlQuery.JoinedTable join = (SqlQuery.JoinedTable)element;
Visit(join.Table, all, action);
Visit(join.Condition, all, action);
break;
}
case QueryElementType.SearchCondition:
{
foreach (SqlQuery.Condition c in ((SqlQuery.SearchCondition)element).Conditions)
{
Visit(c, all, action);
}
break;
}
case QueryElementType.Condition:
{
Visit(((SqlQuery.Condition)element).Predicate, all, action);
break;
}
case QueryElementType.ExprPredicate:
{
Visit(((SqlQuery.Predicate.Expr)element).Expr1, all, action);
break;
}
case QueryElementType.NotExprPredicate:
{
Visit(((SqlQuery.Predicate.NotExpr)element).Expr1, all, action);
break;
}
case QueryElementType.ExprExprPredicate:
{
SqlQuery.Predicate.ExprExpr p = (SqlQuery.Predicate.ExprExpr)element;
Visit(p.Expr1, all, action);
Visit(p.Expr2, all, action);
break;
}
case QueryElementType.LikePredicate:
{
SqlQuery.Predicate.Like p = (SqlQuery.Predicate.Like)element;
Visit(p.Expr1, all, action);
Visit(p.Expr2, all, action);
Visit(p.Escape, all, action);
break;
}
case QueryElementType.BetweenPredicate:
{
SqlQuery.Predicate.Between p = (SqlQuery.Predicate.Between)element;
Visit(p.Expr1, all, action);
Visit(p.Expr2, all, action);
Visit(p.Expr3, all, action);
break;
}
case QueryElementType.IsNullPredicate:
{
Visit(((SqlQuery.Predicate.IsNull)element).Expr1, all, action);
break;
}
case QueryElementType.InSubqueryPredicate:
{
SqlQuery.Predicate.InSubQuery p = (SqlQuery.Predicate.InSubQuery)element;
Visit(p.Expr1, all, action);
Visit(p.SubQuery, all, action);
break;
}
case QueryElementType.InListPredicate:
{
SqlQuery.Predicate.InList p = (SqlQuery.Predicate.InList)element;
Visit(p.Expr1, all, action);
foreach (ISqlExpression value in p.Values)
{
Visit(value, all, action);
}
break;
}
case QueryElementType.FuncLikePredicate:
{
SqlQuery.Predicate.FuncLike p = (SqlQuery.Predicate.FuncLike)element;
Visit(p.Function, all, action);
break;
}
case QueryElementType.SetExpression:
{
SqlQuery.SetExpression s = (SqlQuery.SetExpression)element;
Visit(s.Column, all, action);
Visit(s.Expression, all, action);
break;
}
case QueryElementType.SetClause:
{
SqlQuery.SetClause sc = (SqlQuery.SetClause)element;
if (sc.Into != null)
{
Visit(sc.Into, all, action);
}
foreach (SqlQuery.SetExpression c in sc.Items.ToArray())
{
Visit(c, all, action);
}
break;
}
case QueryElementType.SelectClause:
{
SqlQuery.SelectClause sc = (SqlQuery.SelectClause)element;
Visit(sc.TakeValue, all, action);
Visit(sc.SkipValue, all, action);
foreach (SqlQuery.Column c in sc.Columns.ToArray())
{
Visit(c, all, action);
}
break;
}
case QueryElementType.FromClause:
{
foreach (SqlQuery.TableSource t in ((SqlQuery.FromClause)element).Tables)
{
Visit(t, all, action);
}
break;
}
case QueryElementType.WhereClause:
{
Visit(((SqlQuery.WhereClause)element).SearchCondition, all, action);
break;
}
case QueryElementType.GroupByClause:
{
foreach (ISqlExpression i in ((SqlQuery.GroupByClause)element).Items)
{
Visit(i, all, action);
}
break;
}
case QueryElementType.OrderByClause:
{
foreach (SqlQuery.OrderByItem i in ((SqlQuery.OrderByClause)element).Items)
{
Visit(i, all, action);
}
break;
}
case QueryElementType.OrderByItem:
{
Visit(((SqlQuery.OrderByItem)element).Expression, all, action);
break;
}
case QueryElementType.Union:
Visit(((SqlQuery.Union)element).SqlQuery, all, action);
break;
case QueryElementType.SqlQuery:
{
if (all)
{
if (_visitedElements.ContainsKey(element))
{
return;
}
_visitedElements.Add(element, element);
}
SqlQuery q = (SqlQuery)element;
if (q.QueryType == QueryType.Update || q.QueryType == QueryType.Insert)
{
Visit(q.Set, all, action);
}
else
{
Visit(q.Select, all, action);
}
Visit(q.From, all, action);
Visit(q.Where, all, action);
Visit(q.GroupBy, all, action);
Visit(q.Having, all, action);
Visit(q.OrderBy, all, action);
if (q.HasUnion)
{
foreach (SqlQuery.Union i in q.Unions)
{
if (i.SqlQuery == q)
{
throw new InvalidOperationException();
}
Visit(i, all, action);
}
}
break;
}
}
action(element);
if (!all)
{
_visitedElements.Add(element, element);
}
}