51工具盒子从善如登，从恶如崩。一一《国语》
我们在使用mybatis-plus条件构造器默认查询的时候
如果给的实体有值，则会根据实体内的值用对应字段去=查询
就像这样
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| 1 2 | hljs java mpUserService.list(Wrappers.lambdaQuery(UserPO.builder().username("hino").build())); mpUserMapper.selectList(Wrappers.lambdaQuery(UserPO.builder().username("ruben").build())); |
如果我们想要指定默认查询为LIKE
则可以在对应属性上加上注解@TableField并指定condition = SqlCondition.LIKE，就像这样
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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 | hljs java package com.ruben.pojo.po; import com.baomidou.mybatisplus.annotation.*; import com.ruben.pojo.BaseEntity; import com.ruben.pojo.UserInfo; import lombok.*; import java.io.Serializable; /** * @ClassName: UserPO * @Description: 我还没有写描述 * @Date: 2020/11/21 0021 15:55 * * * @author: <achao1441470436@gmail.com> * @version: 1.0 * @since: JDK 1.8 */ @Data @Builder @ToString @NoArgsConstructor @AllArgsConstructor @TableName("user") public class UserPO{ @TableField(condition = SqlCondition.LIKE) private String username; } |
指定后我们的查询就变成了LIKE
当然，这里SqlCondition是个枚举
目前支持
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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 | hljs java /* * Copyright (c) 2011-2021, baomidou (jobob@qq.com). * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.baomidou.mybatisplus.annotation; /** * SQL 比较条件常量定义类 * * @author hubin * @since 2018-01-05 */ public class SqlCondition { /** * 等于 */ public static final String EQUAL = "%s=#{%s}"; /** * 不等于 */ public static final String NOT_EQUAL = "%s<>#{%s}"; /** * % 两边 % */ public static final String LIKE = "%s LIKE CONCAT('%%',#{%s},'%%')"; /** * % 左 */ public static final String LIKE_LEFT = "%s LIKE CONCAT('%%',#{%s})"; /** * 右 % */ public static final String LIKE_RIGHT = "%s LIKE CONCAT(#{%s},'%%')"; } |
以上就是今天博客内容啦~
