使用Repeater的ASP.net SQL查询问题

Question

这是我在存储过程中的查询。我正在使用中继器来显示信息。问题是如果我搜索让我们说

Ename = Jim
ELocation = 史密斯中心
ECity = 亚特兰大

通过查询生成器，我得到了两个匹配的结果。但是当我将我的数据源绑定到转发器并添加参数时，然后尝试运行查询，我的转发器是空的。变量从文本框控件传入。此外，如果我只传入一个变量，比如标题，它就可以正常工作。但是当我尝试传入两个或更多变量时，我什么也得不到。有没有人知道该怎么做？

    @title varchar(150),
    @venue varchar(150),
    @city varchar(100),
    @state varchar(50),
    @country varchar(100),
    @desc varchar(150),
    @date smalldatetime = null
AS

SELECT     EID, EName, EDate, EDEnd, ELocation, ECity, EState, EDesc, EWebsite
FROM         esc
WHERE     (@title IS NULL OR EName LIKE '%' + @title + '%') 
           AND (@venue IS NULL OR ELocation LIKE '%' + @venue + '%')
           AND (@city IS NULL OR ECity LIKE '%' + @city + '%') 
           AND (@state IS NULL OR EState LIKE '%' + @state + '%') 
           AND (@country IS NULL OR ECountry = @country) 
           AND (@desc IS NULL OR EDesc LIKE '%' + @desc + '%') 
           AND (@date IS NULL OR EDate = @date)

点击按钮时的精简代码：

        SqlConnection conn = null;
        try
        {
            conn = new SqlConnection("");
            SqlCommand command = new SqlCommand();
            command.Connection = conn;

            command.CommandText = "seesc";
            command.CommandType = CommandType.StoredProcedure;

            SqlParameter title = new SqlParameter();
            title.ParameterName = "@title";
            title.SqlDbType = SqlDbType.VarChar;
            title.Direction = ParameterDirection.Input;
            title.Value = TitleTextBox.Text;

            //other parameters declared here

                command.Parameters.Add(title);
                //other parameters added here

                conn.Open();
                SqlDataReader reader = command.ExecuteReader();
                if (reader.HasRows)
                {
                    evrep.DataSource = reader;
                    evrep.DataBind();
                }
        }
        catch { }

Answer 1

查询本身有一些错字。

       AND (@city IS NULL OR ECity LIKE '+' + @city + '%') 
       AND (@state IS NULL OR EState LIKE '+' + @state + '%')

应该是

       AND (@city IS NULL OR ECity LIKE '%' + @city + '%') 
       AND (@state IS NULL OR EState LIKE '%' + @state + '%')

另外当

       title.Value = TitleTextBox.Text;

使用该参数不会为空，但将具有空字符串的值。那将不符合条件

       AND (@country IS NULL OR ECountry = @country)