Question

用户输入搜索charactre，如* “蓝色，黄绿色，红色粉红色，叠加流量” * 现在我想把它放到数组中，并使用以下代码搜索它，

string[] search = mysearch.Split(',');
List<Result> myresult = new List<Result>();

for (int kk = 1; kk < search.Length; kk++)
  {  


where += " And '%" + search[kk] + "%'";              
    OleDbCommand sqlcmdCommand0 = new OleDbCommand("select Distinct name from table1  where       search like '%" + search[0] + "%' " + where + " order by name", myCon);
     sqlcmdCommand0.CommandType = CommandType.Text;
      OleDbDataReader sda = sqlcmdCommand0.ExecuteReader();

 while(sda.read())
    {
         myresult.name= sda.getString(0);
         Result.add(myresult);
    }
}
return Result;

查询看起来像这样：

select Distinct name from table1 where search like '%blue%' And '%yellow%' And '%Green %' order by name

它应该看起来像这样：

select Distinct name from table1 where search like '%blue%' And '%yellow Green %' order by name

但问题是它在空格不在逗号之后分隔字符串，并且我想在逗号出现之后将字符串放入数组中，而不是在字符之间的空格之后。

Answer 1

好的，我想您可能只想丢弃当前的代码......以下是生成WHERE条件所需要做的事情：

string[] searchTerms = mySearch.Split(',');
StringBuilder conditions = new StringBuilder();
foreach(string term in searchTerms)
{
    if (conditions.Length > 0)
        conditions.Append(" AND ");
    conditions.AppendFormat("search LIKE '%{0}%'", term.Replace("'", "''"));
}
string query = "select Distinct name from table1";
if (conditions.Length > 0)
    query = query + " WHERE " + conditions;

Answer 2

您的SQL不正确，每次比较需要like运算符，每个运算符需要两个操作数。此外，您可能希望在比较之间使用or运算符，否则您只会找到包含所有颜色的记录，而不是任何颜色：

select Distinct name
from table1
where
  search like '%blue%' or
  search like '%yellow%' or
  search like '%green%'
order by name

Answer 3

如果你想在逗号和空格上拆分，请使用带有params参数的重载，并传递一个逗号char和一个空白字符：

"red, blue green".Split(',', ' ');

查询有什么问题？还是代码？

3 个答案: