private Expression SingleFieldTwoArgOrCountMethod(string name, MethodCallExpression node)
{
WriteAppendAtFix(() =>
{
SQLWriter.Select();
SQLWriter.Write(name);
SQLWriter.OpenBrace();
if (node.Arguments.Count > 1)
{
base.Visit(node.Arguments[1]);
}
else
{
SQLWriter.Write("1");
}
SQLWriter.CloseBrace();
if (SQLWriter.IsUnion)
{
SQLWriter.From();
SQLWriter.OpenBrace();
}
}, () => base.Visit(node.Arguments[0]));
if (SQLWriter.IsUnion)
{
SQLWriter.CloseBrace();
SQLWriter.WhiteSpace();
SQLWriter.TableName("CTE_UNION");
}
return(node);
}
private Expression VisitExecuteMethodCall(MethodCallExpression node)
{
switch (node.Method.Name)
{
case MethodCall.From:
var value = (Func <ITableRegions, string>)node.Arguments[1].GetValueFromExpression();
if (value == null)
{
throw new DException("指定表名称不能为空!");
}
SetTableFactory(value);
base.Visit(node.Arguments[0]);
return(node);
case MethodCall.Where:
if (Behavior == ExecuteBehavior.Insert)
{
throw new ExpressionNotSupportedException("插入语句不支持条件，请在查询器中使用条件过滤!");
}
return(MakeWhereNode(node));
case MethodCall.Update:
Behavior = ExecuteBehavior.Update;
base.Visit(node.Arguments[0]);
SQLWriter.AppendAt = 0;
SQLWriter.Update();
SQLWriter.Alias(GetOrAddTablePrefix(typeof(T)));
SQLWriter.Set();
base.Visit(node.Arguments[1]);
SQLWriter.From();
WriteTable(typeof(T));
SQLWriter.AppendAt = -1;
return(node);
case MethodCall.Delete:
Behavior = ExecuteBehavior.Delete;
base.Visit(node.Arguments[0]);
SQLWriter.AppendAt = 0;
SQLWriter.Delete();
SQLWriter.Alias(GetOrAddTablePrefix(typeof(T)));
SQLWriter.From();
WriteTable(typeof(T));
SQLWriter.AppendAt = -1;
return(node);
case MethodCall.Insert:
Behavior = ExecuteBehavior.Insert;
base.Visit(node.Arguments[0]);
SQLWriter.AppendAt = 0;
SQLWriter.Insert();
WriteTable(typeof(T));
SQLWriter.AppendAt = -1;
VisitBuilder(node.Arguments[1]);
return(node);
}
throw new ExpressionNotSupportedException();
}
