/// <summary>
/// 创建一个逻辑表达式对象
/// </summary>
/// <param name="expression"></param>
/// <returns></returns>
public static LogicExpression CreateInstance(string expression)
{
LogicExpression logic = null;
switch (expression)
{
case "和":
case "AND":
case "And":
case "and":
logic = LogicExpression.And();
break;
case "或":
case "OR":
case "Or":
case "or":
logic = LogicExpression.Or();
break;
case "非":
case "NOT":
case "Not":
case "not":
logic = LogicExpression.Not();
break;
case "左括号":
case "(":
logic = LogicExpression.OpenParentheses();
break;
case "右括号":
case ")":
logic = LogicExpression.OpenParentheses();
break;
default:
logic = LogicExpression.And();
break;
}
return(logic);
}
/// <summary>
/// 添加查询条件表达式
/// </summary>
/// <param name="exp"></param>
/// <returns></returns>
public QueryParameter AddWhereExpr(LogicExpression exp)
{
this._whereExpressions.Add(exp);
return(this);
}
/// <summary>
/// 添加 HAVING 表达式
/// </summary>
/// <param name="exp"></param>
/// <returns></returns>
public QueryParameter AddHavingExpr(LogicExpression exp)
{
this._havingExpressions.Add(exp);
return(this);
}
