批量更改 MySQL 中特定字段的所有条目?
mysqlmysqli database
首先我们创建一个演示表 −
mysql> create table BulkChangeDemo -> ( -> CustomerId int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> CustomerName varchar(20), -> isEducated boolean -> ); Query OK, 0 rows affected (1.47 sec)
使用 insert 命令在表中插入一些记录。 查询语句如下 −
mysql> insert into BulkChangeDemo(CustomerName,isEducated) values('Larry',true);
Query OK, 1 row affected (0.09 sec)
mysql> insert into BulkChangeDemo(CustomerName,isEducated) values('John',false);
Query OK, 1 row affected (0.16 sec)
mysql> insert into BulkChangeDemo(CustomerName,isEducated) values('Carol',false);
Query OK, 1 row affected (0.25 sec)
mysql> insert into BulkChangeDemo(CustomerName,isEducated) values('Mike',true);
Query OK, 1 row affected (0.18 sec)
mysql> insert into BulkChangeDemo(CustomerName,isEducated) values('David',false);
Query OK, 1 row affected (0.13 sec)
mysql> insert into BulkChangeDemo(CustomerName,isEducated) values('Bob',false);
Query OK, 1 row affected (0.10 sec)
使用 select 语句显示表中的所有记录。查询如下 −
mysql> select *from BulkChangeDemo;
这是输出 −
+------------+--------------+------------+ | CustomerId | CustomerName | isEducated | +------------+--------------+------------+ | 1 | Larry | 1 | | 2 | John | 0 | | 3 | Carol | 0 | | 4 | Mike | 1 | | 5 | David | 0 | | 6 | Bob | 0 | +------------+--------------+------------+ 6 rows in set (0.00 sec)
以下是批量更改特定字段的所有条目的查询 −
mysql> update BulkChangeDemo set isEducated =true; Query OK, 4 rows affected (0.18 sec) Rows matched: 6 Changed: 4 Warnings: 0
