如何在Visual Studio中编写SQL查询？

Question

我想在Visual Studio中写所有的插入、select和删除查询，但我不知道怎么写。

SqlConnection con = new SqlConnection("Data Source=5CG50749V3\SQLEXPRESS;Initial Catalog=test;Integrated Security=True");
con.Open();

SqlCommand cmd = new SqlCommand("INSERT INTO backup(Option,EquipmentID,SerialNumber,Description,Location,DueDate,DaytoDue,EquipmentWithdraworRemarks,NCRorOOTHistory,LastOOTissuanceDate,AvailableinSapphire,ResponsiblePerson,CalibrationOption,CalibrationSourceorLab,YearofManufacturing,ManufacturerorVendor,CalibrationCost,AssetNo,CalibrationTAT,SendInDate,Status), SELECT * FROM Equipment where (SerialNumber = '" + TextBox2.Text + "' or EquipmentID = '" + TextBox1.Text + "' ), DELETE FROM Equipment where (SerialNumber = '" + TextBox2.Text + "' or EquipmentID = '" + TextBox1.Text + "' )", con);

cmd.ExecuteNonQuery();
con.Close();

Answer 1

SqlCommand(String) 方法仅采用一个参数并使用查询文本初始化 SqlCommand class 的新实例。

Answer 2

您可以使用如下参数化查询来执行此操作：

string connectionstring = "Data Source=5CG50749V3\SQLEXPRESS;Initial Catalog=test;Integrated Security=True";
            using (SqlConnection connection = new SqlConnection(connectionstring))
            {

                string sql = @"INSERT IntO [backup](Option,EquipmentID,SerialNumber,Description,Location,
                                DueDate,DaytoDue,EquipmentWithdraworRemarks,NCRorOOTHistory,LastOOTissuanceDate,
                                AvailableinSapphire,ResponsiblePerson,CalibrationOption,CalibrationSourceorLab,
                                YearofManufacturing,ManufacturerorVendor,CalibrationCost,AssetNo,CalibrationTAT,SendInDate,Status)
                                SELECT * FROM Equipment where SerialNumber = @serialnumber or EquipmentID = @equipmentId; 
                                DELETE FROM Equipment where SerialNumber = @serialnumber or EquipmentID = @equipmentId";
                using (SqlCommand command = new SqlCommand(sql, connection))
                {
                    command.Parameters.Add("@serialnumber", SqlDbType.NVarChar).Value = "testSerialNumber";
                    command.Parameters.Add("@equipmentId", SqlDbType.NVarChar).Value = "testequipmentid";
                    connection.Open();
                    command.ExecuteNonQuery();
                    connection.Close();
                }

            }

如何在Visual Studio中编写SQL查询？

How to write the SQL query in Visual Studio?

sql-server

asp.net

visual-studio-2012