MySQL命令行工具：如何找出受DELETE影响的行数？
您可以在最后使用row_count()。让我们首先创建一个表-
mysql> create table rowAfftectedByDeleteDemo-> (
-> CustomerId int NOT NULL AUTO_INCREMENT PRIMARY KEY,
-> CustomerName varchar(20)
-> );
使用insert命令在表中插入一些记录。查询如下-
mysql> insert into rowAfftectedByDeleteDemo(CustomerName) values('John');mysql> insert into rowAfftectedByDeleteDemo(CustomerName) values('Carol');
mysql> insert into rowAfftectedByDeleteDemo(CustomerName) values('Bob');
mysql> insert into rowAfftectedByDeleteDemo(CustomerName) values('Sam');
mysql> insert into rowAfftectedByDeleteDemo(CustomerName) values('David');
mysql> insert into rowAfftectedByDeleteDemo(CustomerName) values('Maxwell');
mysql> insert into rowAfftectedByDeleteDemo(CustomerName) values('Ramit');
mysql> insert into rowAfftectedByDeleteDemo(CustomerName) values('James');
使用select语句显示表中的所有记录。查询如下-
mysql> select *from rowAfftectedByDeleteDemo;
这是输出-
+------------+--------------+| CustomerId | CustomerName |
+------------+--------------+
| 1 | John |
| 2 | Carol |
| 3 | Bob |
| 4 | Sam |
| 5 | David |
| 6 | Maxwell |
| 7 | Ramit |
| 8 | James |
+------------+--------------+
8 rows in set (0.00 sec)
在从表中删除行之前，row_count()的值如下所示：
mysql> select row_count();
这是输出-
+-------------+| row_count() |
+-------------+
| -1 |
+-------------+
1 row in set (0.00 sec)
以下是从表中删除行的查询-
mysql> delete from rowAfftectedByDeleteDemo where CustomerId =3 || CustomerId =4 || CustomerId =5 || CustomerId =6;
从表中删除行后，row_count()的值如下所示：
mysql> select row_count();
这是输出-
+-------------+| row_count() |
+-------------+
| 4 |
+-------------+
1 row in set (0.00 sec)
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