/// <summary>
/// 将表达式转化为 TSQL 查询表达式字串
/// </summary>
public override string ToString()
{
string s = null;
if (this.__Column == 0 && base.__Operate == SQLHelper.Operators.Custom)
{
s = (string)base.__Value; //for full custom expression support
}
else
{
switch (this.__Column)
{
case DI.dbo_uf_Split.id:
if (base.__Operate == SQLHelper.Operators.Custom)
{
s = "[id]" + (string)base.__Value;
}
else if (base.__Operate == SQLHelper.Operators.In || base.__Operate == SQLHelper.Operators.NotIn)
{
s = "[id] " + SQLHelper.GetOperater(base.__Operate) + " (" + SQLHelper.Combine <int>((IEnumerable <int>)base.__Value) + ")";
}
else
{
s = "[id] " + SQLHelper.GetOperater(base.__Operate) + " " + base.__Value.ToString();
}
break;
case DI.dbo_uf_Split.item:
if (base.__Operate == SQLHelper.Operators.Custom)
{
s = "[item]" + (string)base.__Value;
}
else if (base.__Operate == SQLHelper.Operators.In || base.__Operate == SQLHelper.Operators.NotIn)
{
s = "[item] " + SQLHelper.GetOperater(base.__Operate) + " (" + SQLHelper.Combine <string>((IEnumerable <string>)base.__Value) + ")";
}
else if (base.__Value == null && base.__Operate == SQLHelper.Operators.Equal)
{
s = "[item] IS NULL";
}
else if (base.__Value == null && base.__Operate == SQLHelper.Operators.NotEqual)
{
s = "[item] IS NOT NULL";
}
else if (base.__Operate == SQLHelper.Operators.Like)
{
s = "[item] LIKE '%" + SQLHelper.EscapeLike((string)base.__Value) + "%'";
}
else if (base.__Operate == SQLHelper.Operators.CustomLike)
{
s = "[item] LIKE '" + SQLHelper.EscapeEqual((string)base.__Value) + "'";
}
else if (base.__Operate == SQLHelper.Operators.NotLike)
{
s = "[item] NOT LIKE '%" + SQLHelper.EscapeLike((string)base.__Value) + "%'";
}
else if (base.__Operate == SQLHelper.Operators.CustomNotLike)
{
s = "[item] NOT LIKE '" + SQLHelper.EscapeEqual((string)base.__Value) + "'";
}
else
{
s = "[item] " + SQLHelper.GetOperater(base.__Operate) + " '" + SQLHelper.EscapeEqual((string)base.__Value) + "'";
}
break;
}
}
if (this.__Nodes != null && this.__Nodes.Count > 0)
{
s = "(" + s;
foreach (dbo_uf_Split __node in this.__Nodes)
{
s += " " + (this.__IsAndEffect ? "AND" : "OR") + " " + __node.ToString();
}
s += ")";
}
return(s);
}