C# MSSQL数据库查询SQL语句拼接
MSSQL数据库查询SQL语句拼接
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 | 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> |
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