记录Access数据库更新操作大坑一个

Posted 2020-08-15 David Huang

　　对于更新Access数据库的操作，必须保持参数数组与sql语句中参数顺序一致，如下：

 1  public bool Update(MyModel model)
 2         {
 3             StringBuilder strSql = new StringBuilder();
 4             strSql.Append("update table1 set ");
 5             strSql.Append(" column1 = @column1 , ");
 6             strSql.Append(" column2 = @column2, ");
 7             strSql.Append(" where [email protected] ");
 8 
 9             OleDbParameter[] parameters =
10                 {
11                     // 必须要这个顺序 ヾ(。￣□￣)?゜゜゜
12                     new OleDbParameter("@column1", OleDbType.Integer, 4),
13                     new OleDbParameter("@column2", OleDbType.Integer, 4),
14                     new OleDbParameter("@ID", OleDbType.Integer, 4)
15                 };
16 
17             parameters[0].Value = model.column1;
18             parameters[1].Value = model.column1;
19             parameters[2].Value = model.ID;
20 
21             int rows = DbHelperOleDb.ExecuteSql(strSql.ToString(), parameters);
22             if (rows > 0)
23             {
24                 return true;
25             }
26             else
27             {
28                 return false;
29             }
30         }

　　如果改成下面这样，顺序不一致了，就妥妥的更新失败，还不报任何异常。。。。

 1         public bool Update(MyModel model)
 2         {
 3             StringBuilder strSql = new StringBuilder();
 4             strSql.Append("update table1 set ");
 5             strSql.Append(" column1 = @column1 , ");
 6             strSql.Append(" column2 = @column2, ");
 7             strSql.Append(" where [email protected] ");
 8 
 9             OleDbParameter[] parameters =
10                 {
11                     // 顺序与sql语句不一致了 ヾ(。￣□￣)?゜゜゜
12                     new OleDbParameter("@ID", OleDbType.Integer, 4),
13                     new OleDbParameter("@column1", OleDbType.Integer, 4),
14                     new OleDbParameter("@column2", OleDbType.Integer, 4)
15                 };
16 
17             parameters[0].Value = model.ID;
18             parameters[1].Value = model.column1;
19             parameters[2].Value = model.column1;
20 
21             int rows = DbHelperOleDb.ExecuteSql(strSql.ToString(), parameters);
22             if (rows > 0)
23             {
24                 return true;
25             }
26             else
27             {
28                 return false;
29             }
30         }