Question

我尝试像其他选择一样转换为int，但是这种情况是多选，而foreach不适用于int类型。我试过这个并且它有效:(但）....

//var id_status = Convert.ToInt32(Request.Form["id_status"]);    
var id_status = Request.Form["id_status"];
var id_cliente = Convert.ToInt32(Request.Form["id_cliente"]);

var sql = "SELECT * FROM ativacao INNER JOIN cliente ON ativacao.id_cliente = cliente.id WHERE ativacao.id_cliente =" + id_cliente;

if (id_status != null)
{
    foreach (var itemselecionado in id_status)
    {
        sql = sql + " OR ativacao.status = '" + itemselecionado + "'";
    }
}

但是，这个foreach甚至可以使用逗号，即SQL查询无效。

如何获得正确的SQL查询？

SQL变量的最终值：

"SELECT * FROM ativacao 
INNER JOIN cliente 
ON ativacao.id_cliente = cliente.id 
WHERE ativacao.id_cliente =106 
AND cliente.id_prospector = 2 
AND cliente.id_executivo = 1 
AND cliente.ano_cliente = '2015' 
-->    OR ativacao.status = '4' 
    OR ativacao.status = ',' 
    OR ativacao.status = '5' 
    OR ativacao.status = ',' 
    OR ativacao.status = '6'   <--

如果我不能很好地解释，我很抱歉，我不太懂英语。

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Answer 1

您也可以在此处使用in子句。创建和生成良好的查询也很容易。这是代码：

if (id_status != null)
{
   string inClause = " ativacao.status in (";
   foreach (var itemselecionado in id_status)
   {
     if(itemselecionado.Trim() == ",")
     {
         countinue;
     }
     inClause += "'" + itemselecionado + "',";
   }
   inClause = inClause.SubString(0, inClause.Length - 1) + ")";
   sql = sql + inClause;
}

修改：您的查询将如下所示。

"SELECT * FROM ativacao INNER JOIN cliente ON 
ativacao.id_cliente = Cliente.id WHERE ativacao.id_cliente = 106 AND
cliente.id_prospector = 2
AND cliente.id_executivo = 1 AND cliente.ano_cliente = '2015'
OR ativacao.status in ('4', '5', '6')"

由于

Answer 2

编辑：您可以在foreach循环中执行此操作：

if(itemselecionado == ',') continue;

控制器asp.net mvc5中的简单SQL查询语法错误

2 个答案: