项目开发时,有时需要对连接资源进行有效利用,同时避免不必要的程序遍历时间导致方法执行效率降低,因此对更新操作有了批量操作的需求。
1、数据模型
public class SysUserEntity implements Serializable {
private static final long serialVersionUID = 1L;
/** 主键 */
private Integer id;
/** 用户名 */
private String username;
/** 密码 */
private String password;
/** 真实姓名 */
private String realName;
/** 联系电话 */
private String telephone;
/** 邮箱 */
private String mail;
}
2、表结构以及初始值
SET NAMES utf8mb4;
SET FOREIGN_KEY_CHECKS = 0;
-- ----------------------------
-- Table structure for sys_user
-- ----------------------------
DROP TABLE IF EXISTS `sys_user`;
CREATE TABLE `sys_user` (
`id` int(11) NOT NULL AUTO_INCREMENT COMMENT '主键',
`username` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL COMMENT '用户名',
`password` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '密码',
`real_name` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '真实姓名',
`telephone` varchar(20) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '联系电话',
`mail` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '邮箱',
PRIMARY KEY (`id`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 9 CHARACTER SET = utf8 COLLATE = utf8_general_ci COMMENT = '用户信息表' ROW_FORMAT = Dynamic;
-- ----------------------------
-- Records of sys_user
-- ----------------------------
INSERT INTO `sys_user` VALUES (1, 'admin', '111111', '超级管理员', '15583301101', '[email protected]');
INSERT INTO `sys_user` VALUES (2, 'zhangsan', '111111', '张三', '15583301101', '[email protected]');
INSERT INTO `sys_user` VALUES (3, 'lisi', '111111', '李四', '15583301101', '[email protected]');
INSERT INTO `sys_user` VALUES (4, 'zhangtianshi', '111111', '张天师', '15583301101', '[email protected]');
INSERT INTO `sys_user` VALUES (5, 'zhangsanfeng', '111111', '张三丰', '15583301101', '[email protected]');
INSERT INTO `sys_user` VALUES (6, 'lishimin', '111111', '李世民', '15583301101', '[email protected]');
INSERT INTO `sys_user` VALUES (7, 'lishikai', '111111', '李世凯', '15583301101', '[email protected]');
INSERT INTO `sys_user` VALUES (8, 'lisikai', '111111', '李四开', '15583301101', '[email protected]');
/**
* 批量更新用户信息(方式一:采用mysql连接允许多条sql执行,将update语句分次执行)
*/
int updateUserItem(List<SysUserEntity> list);
<update id="updateUserItem" parameterType="java.util.List">
<foreach collection="list" item="item" separator=";">
update sys_user
<set>
<if test="item.username != null and item.username.trim() != ''">
`username` = #{item.username},
if>
<if test="item.password != null and item.password.trim() != ''">
`password` = #{item.password},
if>
<if test="item.realName != null and item.realName.trim() != ''">
`real_name` = #{item.realName},
if>
<if test="item.telephone != null and item.telephone.trim() != ''">
`telephone` = #{item.telephone},
if>
<if test="item.mail != null and item.mail.trim() != ''">
`mail` = #{item.mail}
if>
set>
where `id` = #{item.id}
foreach>
update>
@Test
public void updateUserItemTest() {
SysUserEntity sysUser = new SysUserEntity(3,"lisi", "123456", "李四",
"12345", "[email protected]");
SysUserEntity sysUser2 = new SysUserEntity(6,"lishimin", "1234", "李世民",
"66612142", "[email protected]");
List<SysUserEntity> list = new ArrayList<>();
list.add(sysUser);
list.add(sysUser2);
sysUserDao.updateUserItem(list);
}
spring:
datasource:
# &allowMultiQueries=true 表示允许执行多条sql
url: jdbc:mysql://127.0.0.1:3306/learntest?useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai&allowMultiQueries=true
/**
* 批量更新用户信息(方式二:采取case when语法)
*/
int updateUserItem2(List<SysUserEntity> list);
<update id="updateUserItem2" parameterType="java.util.List">
update sys_user
<trim prefix="set" suffixOverrides=",">
<trim prefix="username = case" suffix="end,">
<foreach collection="list" item="item">
<if test="item.username != null and item.username.trim() != ''">
when id=#{item.id} then #{item.username}
if>
foreach>
trim>
<trim prefix="password = case" suffix="end,">
<foreach collection="list" item="item">
<if test="item.password != null and item.password.trim() != ''">
when id=#{item.id} then #{item.password}
if>
foreach>
trim>
<trim prefix="real_name = case" suffix="end,">
<foreach collection="list" item="item">
<if test="item.realName != null and item.realName.trim() != ''">
when id=#{item.id} then #{item.realName}
if>
foreach>
trim>
<trim prefix="telephone = case" suffix="end,">
<foreach collection="list" item="item">
<if test="item.telephone != null and item.telephone.trim() != ''">
when id=#{item.id} then #{item.telephone}
if>
foreach>
trim>
<trim prefix="mail = case" suffix="end,">
<foreach collection="list" item="item">
<if test="item.mail != null and item.mail.trim() != ''">
when id=#{item.id} then #{item.mail}
if>
foreach>
trim>
trim>
<where>
<foreach collection="list" item="item" open="( " separator=") or (" close=" )">
id = #{item.id}
foreach>
where>
update>
@Test
public void updateUserItem2Test() {
SysUserEntity sysUser = new SysUserEntity(2,"zhangsan", "123456", "张三11",
"12121", "[email protected]");
SysUserEntity sysUser2 = new SysUserEntity(5,"zhangsanfeng", "1234", "李世民",
"114114", "[email protected]");
List<SysUserEntity> list = new ArrayList<>();
list.add(sysUser);
list.add(sysUser2);
sysUserDao.updateUserItem2(list);
}
码云地址:https://gitee.com/raoshuang/mybatis-batch-update
以上就是本次验证记录