C# MSSQL数据库查询SQL语句拼接

MSSQL数据库查询SQL语句拼接

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string dbConStr = ConfigurationManager.ConnectionStrings["dbConStr"].ConnectionString;         
string sqlText = "SELECT * FROM UserInfo";
List<string> whileList = new List<string>();
List<SqlParameter> para = new List<SqlParameter>();
 
using (SqlConnection conn = new SqlConnection(dbConStr))
{
    using (SqlCommand cmd = conn.CreateCommand())
    {
        conn.Open();                   
        if (!string.IsNullOrEmpty(txtUserName.Text))
        {     
            string strSql = "userName like  %@userName%";
            whileList.Add(strSql);                        
            para.Add(cmd.Parameters.AddWithValue("@userName", "%"+txtUserName.Text+"%"));   
        }  
 
        if (!string.IsNullOrEmpty(txtAddress.Text))
        {
            string strSql = "address like  %@address%";
            whileList.Add(strSql);
            SqlParameter  p = cmd.Parameters.AddWithValue("@address", "%" + txtAddress.Text + "%");
            para.Add(p);
 
            //SqlParameter para = new SqlParameter();
            //para.ParameterName = "@address";
            //para.Value = "%" + txtAddress + "%";
        }     
 
        if(whileList.Count > 0){
           sqlText +=  " where " + string.Join(" and ", whileList);
        }
 
        lbResult.Text = sqlText;
        //textBox1.Text = sqlText;
 
      SqlParameter[] sqlpara = para.ToArray();
 
      foreach (var item in sqlpara)
      {
          MessageBox.Show(item.ParameterName + " " + item.Value);}}<br><br>

  

posted @   Nanyingming  阅读(415)  评论(0编辑  收藏  举报
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