Question

我有这个更新查询不工作，即使它没有显示任何错误，只有没有行影响/匹配：

UPDATE `Budget` SET `amount` = 500, `rest` = 500 WHERE `company_number` = 1 AND `section_number` = 1 AND `chapter_number` = 1 AND `article_number` = 3 AND `subarticle_number` = 0 AND `ssubarticle_number` = 0

但是当我从数据库中执行“SELECT”时，我得到了一行返回：

SELECT * FROM Budget WHERE `company_number` = 1 AND `section_number` = 1 AND `chapter_number` = 1 AND `article_number` = 3 AND `subarticle_number` = 0 AND `ssubarticle_number` = 0

这是“预算”表：

CREATE TABLE `budget` (
  `budget_id` int(11) NOT NULL AUTO_INCREMENT,
  `company_number` int(11) NOT NULL DEFAULT '0',
  `section_number` int(11) NOT NULL DEFAULT '0',
  `chapter_number` int(11) NOT NULL DEFAULT '0',
  `article_number` int(11) NOT NULL DEFAULT '0',
  `subarticle_number` int(11) NOT NULL DEFAULT '0',
  `ssubarticle_number` int(11) NOT NULL DEFAULT '0',
  `name` varchar(90) DEFAULT NULL,
  `amount` double DEFAULT NULL,
  `rest` double DEFAULT NULL,
  `insert_date` date DEFAULT NULL,
  `transfer_date` date DEFAULT NULL,
  `has_children` bit(1) DEFAULT NULL,
  PRIMARY KEY (`budget_id`)
) ENGINE=InnoDB AUTO_INCREMENT=16 DEFAULT CHARSET=utf8;

我用来运行查询的方法。

public bool UpdateTransfer(string companyNumber, string sectionNumber, string transferNumber, string TransferDate, 
                                   string[] budgetRow, string oldAmount, string newAmount)
        {
            MySqlTransaction tr = connection.BeginTransaction();
            cmdQuery = connection.CreateCommand();
            cmdQuery.Connection = connection;
            cmdQuery.Transaction = tr;
            try
            {
                cmdQuery.CommandText = @"SET SQL_SAFE_UPDATES = 0;";
                cmdQuery.ExecuteNonQuery();


                // First, we return the old amount to the source row budget
                cmdQuery.CommandText = @"UPDATE Budget SET `rest` = `rest` + " + oldAmount +
                                        " WHERE `company_number` = " + companyNumber + " AND `section_number` = " + sectionNumber +
                                        " AND `chapter_number` = " + budgetRow[0] + " AND `article_number` = " + budgetRow[1] +
                                        " AND `subarticle_number` = " + budgetRow[2] + " AND `ssubarticle_number` = " + budgetRow[3];
                cmdQuery.ExecuteNonQuery();
                MessageBox.Show(cmdQuery.CommandText);

                // Second, we make the transfer and substract the new amount from the source row budget
                cmdQuery.CommandText = @"UPDATE `Budget` SET `rest` = `rest` - " + newAmount +
                                        " WHERE `company_number` = " + companyNumber + " AND `section_number` = " + sectionNumber +
                                        " AND `chapter_number` = " + budgetRow[0] + " AND `article_number` = " + budgetRow[1] +
                                        " AND `subarticle_number` = " + budgetRow[2] + " AND `ssubarticle_number` = " + budgetRow[3];
                cmdQuery.ExecuteNonQuery();
                MessageBox.Show(cmdQuery.CommandText);

                // Third, update the rest and new amount of destination row budget
                cmdQuery.CommandText = @"UPDATE `Budget` SET `amount` = " + newAmount + ", `rest` = " + newAmount +
                                        " WHERE `company_number` = " + companyNumber + " AND `section_number` = " + sectionNumber +
                                        " AND `chapter_number` = " + budgetRow[4] + " AND `article_number` = " + budgetRow[5] +
                                        " AND `subarticle_number` = " + budgetRow[6] + " AND `ssubarticle_number` = " + budgetRow[7];
                cmdQuery.ExecuteNonQuery();
                MessageBox.Show(cmdQuery.CommandText);

                // Last step, update the transfer table.
                cmdQuery.CommandText = @"UPDATE `Transfer` SET `amount` = " + newAmount + ", `transfer_date` ='" + TransferDate + "'" +
                                        " WHERE `transfer_number` = " + transferNumber +
                                        " AND `company_number` = " + companyNumber + " AND `section_number` = " + sectionNumber +
                cmdQuery.ExecuteNonQuery();
                MessageBox.Show(cmdQuery.CommandText);

                cmdQuery.CommandText = @"SET SQL_SAFE_UPDATES = 1;";
                cmdQuery.ExecuteNonQuery();
                tr.Commit();
                return true;
            }
            catch (MySqlException ex)
            {
                MessageBox.Show("error " + ex.ErrorCode.ToString());
                tr.Rollback();
                return false;
            }
        }
    }

Answer 1

以下是一个示例，说明如何在C＃

上执行sql后验证是否有行更改

public static Boolean PerformDatabaseAction(string sqlQuery) 
{
    using (SqlConnection con = DbConnect()) // Get SqlConnection
    {
        SqlCommand cmd = new SqlCommand(sqlQuery); 
        cmd = new SqlCommand(sqlQuery); 
        CommandType = System.Data.CommandType.Text; 
        Connection = con; 
        int rows = cmd.ExecuteNonQuery(); // Gets the count of affected rows
        if(rows > 0)
            return true;
        else 
            return false;
    }
}

你的查询是有效的，所以试试这个。

MySQL - UPDATE查询不影响行

1 个答案: