MyBatis詳解

Mybatis框架入門教程

MyBatisPlus筆記

狂神說MyBatis01：第一個(gè)程序

mybatis看這一篇就夠了，簡單全面一發(fā)入魂

三天擼完了MyBatis，各位隨便問！！（冰河吐血整理，建議收藏）

SpringBoot整合Mybatis通用Mapper

Hibernate與MyBatis的區(qū)別

Mybatis Select…for update用法

Mybatis中Mapper映射文件詳解

mybatis 根據(jù)多個(gè)id查詢數(shù)據(jù) foreach標(biāo)簽

MyBatis-Plus，為簡化開發(fā)而生，基于3.0.5版本

Mybatis整合spring詳細(xì)教程（帶思路）

第04篇:Mybatis代理對(duì)象生成

第01篇:Mybatis學(xué)習(xí)之環(huán)境搭建

Mybatis-Plus的介紹和使用

MyBatis是什么？使用它作為持久層框架有什么優(yōu)點(diǎn)？

學(xué)習(xí)記錄十一

學(xué)習(xí)記錄十二

學(xué)習(xí)記錄十三

mybatis是否已經(jīng)過時(shí)了？

基于 SpringBoot + MyBatis 的在線五子棋對(duì)戰(zhàn)

超簡單，Spring boot 配置mybatis

SpringBoot配置Mybatis的三種方式

springboot整合mybatis配置

springBoot整合mybatis

【SSM框架】MyBatis核心配置文件詳解

MyBatis系列學(xué)習(xí)匯總

MyBatis詳細(xì)介紹

MyBatis使用步驟總結(jié)

配置mybatis-config.xml 全局的配置文件 (1、數(shù)據(jù)源，2、外部的mapper)

創(chuàng)建XxxMapper.xml 映射文件(寫sql語句)

創(chuàng)建SqlSessionFactory

通過SqlSessionFactory創(chuàng)建SqlSession對(duì)象

通過SqlSession操作數(shù)據(jù)庫 CRUD

調(diào)用session.commit()提交事務(wù)

調(diào)用session.close()關(guān)閉會(huì)話

Mybatis的功能相對(duì)而言還是比較弱的，缺少了好多必要的輔助庫，字符串處理等等，擴(kuò)展也比較困難，一般也就可能對(duì)返回值進(jìn)行一些處理。因此最好僅僅把它作為單純的SQL配置文件，以及簡單的ORM框架。不要嘗試在Mybatis中做過多的動(dòng)態(tài)SQL，否則會(huì)導(dǎo)致后續(xù)的維護(hù)非常惡心。到這就要知道一下，Mybatis plus 不香嗎它是在 MyBatis 的基礎(chǔ)上只做增強(qiáng)不做改變，為簡化開發(fā)、提高效率而生。

1.特性
無侵入：只做增強(qiáng)不做改變，引入它不會(huì)對(duì)現(xiàn)有工程產(chǎn)生影響，如絲般順滑
損耗小：啟動(dòng)即會(huì)自動(dòng)注入基本 CURD，性能基本無損耗，直接面向?qū)ο蟛僮?br /> 強(qiáng)大的 CRUD 操作：內(nèi)置通用 Mapper、通用 Service，僅僅通過少量配置即可實(shí)現(xiàn)單表大部分 CRUD 操作，更有強(qiáng)大的條件構(gòu)造器，滿足各類使用需求
支持 Lambda 形式調(diào)用：通過 Lambda 表達(dá)式，方便的編寫各類查詢條件，無需再擔(dān)心字段寫錯(cuò)
支持主鍵自動(dòng)生成：支持多達(dá) 4 種主鍵策略（內(nèi)含分布式唯一 ID 生成器 - Sequence），可自由配置，完美解決主鍵問題
支持 ActiveRecord 模式：支持 ActiveRecord 形式調(diào)用，實(shí)體類只需繼承 Model 類即可進(jìn)行強(qiáng)大的 CRUD 操作
支持自定義全局通用操作：支持全局通用方法注入（ Write once, use anywhere ）
內(nèi)置代碼生成器：采用代碼或者 Maven 插件可快速生成 Mapper 、 Model 、 Service 、 Controller 層代碼，支持模板引擎，更有超多自定義配置等您來使用
內(nèi)置分頁插件：基于 MyBatis 物理分頁，開發(fā)者無需關(guān)心具體操作，配置好插件之后，寫分頁等同于普通 List 查詢
分頁插件支持多種數(shù)據(jù)庫：支持 MySQL、MariaDB、Oracle、DB2、H2、HSQL、SQLite、Postgre、SQLServer 等多種數(shù)據(jù)庫
內(nèi)置性能分析插件：可輸出 SQL 語句以及其執(zhí)行時(shí)間，建議開發(fā)測試時(shí)啟用該功能，能快速揪出慢查詢
內(nèi)置全局?jǐn)r截插件：提供全表 delete 、 update 操作智能分析阻斷，也可自定義攔截規(guī)則，預(yù)防誤操作

總結(jié)三大突出特性

1）潤物無聲
只做增強(qiáng)不做改變，引入它不會(huì)對(duì)現(xiàn)有工程產(chǎn)生影響，如絲般順滑。
2）效率至上
只需簡單配置，即可快速進(jìn)行單表 CRUD 操作，從而節(jié)省大量時(shí)間。
3）豐富功能
代碼生成、物理分頁、性能分析等功能一應(yīng)俱全。

2. 支持?jǐn)?shù)據(jù)庫
mysql 、mariadb 、oracle 、db2 、h2 、hsql 、sqlite 、postgresql 、sqlserver 、presto 、Gauss 、Firebird
Phoenix 、clickhouse 、Sybase ASE 、 OceanBase 、達(dá)夢(mèng)數(shù)據(jù)庫 、虛谷數(shù)據(jù)庫 、人大金倉數(shù)據(jù)庫 、南大通用數(shù)據(jù)庫

3. 框架結(jié)構(gòu)

10. 動(dòng)態(tài)sql

UserMapper

<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE mapperPUBLIC "-//mybatis.org//DTD Mapper 3.0//EN""http://mybatis.org/dtd/mybatis-3-mapper.dtd"> <mapper namespace="cn.itcast.mybatis.mapper.UserMapper"><!-- <sql id="commonSql">id,user_name,password,name,age,sex,birthday,created,updated</sql> --><select id="loginByMap" resultType="User">select * from tb_user where user_name=#{userName} and password=#{password}</select><select id="login" resultType="User">select * from tb_user where user_name=#{userName} and password=#{password}</select><select id="queryUsersByTableName" resultType="User">select * from ${tableName}</select><select id="queryUserById" resultType="User" parameterType="long">select * from tb_user where id = #{id}</select><resultMap id="userMap" type="User" autoMapping="true"><id column="id" property="id"/></resultMap><select id="queryUserById1" resultMap="userMap">select * from tb_user where id = #{id}</select><select id="queryUserAll" resultType="User" >select * from tb_user</select><insert id="insertUser" parameterType="User">INSERT INTO tb_user (user_name,password,name,age,sex,birthday,created,updated)VALUES(#{userName},#{password},#{name},#{age},#{sex},#{birthday},NOW(),NOW());</insert><update id="updateUser" parameterType="User">UPDATE tb_userSETuser_name = #{userName},password = #{password},name = #{name},age = #{age},sex = #{sex},birthday = #{birthday},updated = NOW()WHERE(id = #{id});</update><delete id="deleteUserById" parameterType="java.lang.Long">delete from tb_user where id=#{id}</delete><select id="queryUsersLikeUserName" resultType="User"><!-- select <include refid="CommonSQL.commonSql"></include> from tb_user where user_name like '%' #{userName} '%'--><!-- if:判斷 test：OGNL表達(dá)式-->select * from tb_user where sex=3<if test="userName!=null and userName.trim()!=''">and user_name like '%' #{userName} '%'</if></select><select id="queryUserListLikeUserNameOrAge" resultType="User">select * from tb_user where sex=3<!-- choose:條件選擇when：test-判斷條件，一旦有一個(gè)when成立，后續(xù)的when都不再執(zhí)行otherwise：所有的when都不成立時(shí)，才會(huì)執(zhí)行--><choose><when test="userName!=null and userName.trim()!=''">and user_name like '%' #{userName} '%'</when><when test="age != null">and age = #{age}</when><otherwise>and user_name = 'zhangsan' </otherwise></choose></select><select id="queryUserListLikeUserNameAndAge" resultType="User">select * from tb_user<!--自動(dòng)添加where關(guān)鍵字有一定的糾錯(cuò)功能：去掉sql語句塊之前多余的一個(gè)and|or通常結(jié)合if或者choose使用--><where><if test="userName!=null and userName.trim()!=''">user_name like '%' #{userName} '%'</if><if test="age!=null">and age = #{age}</if></where></select><select id="queryUserListByIds" resultType="User">select * from tb_user where id in<!--foreach:遍歷集合collection：接收的集合參數(shù)item：遍歷的集合中的一個(gè)元素separator:分隔符open:以什么開始close：以什么結(jié)束--><foreach collection="ids" item="id" separator="," open="(" close=")">#{id}</foreach></select><update id="updateUserSelective">UPDATE tb_user<!--set自動(dòng)添加set關(guān)鍵字也有一定的糾錯(cuò)功能：自動(dòng)去掉sql語句塊之后多余的一個(gè)逗號(hào)--><set><if test="userName!=null and userName.trim()!=''">user_name = #{userName},</if><if test="password!=null and password.trim()!=''">password = #{password},</if><if test="name!=null and name.trim()!=''">name = #{name},</if><if test="age!=null">age = #{age},</if><if test="sex!=null">sex = #{sex},</if>updated = now(),</set>WHERE(id = #{id});</update></mapper>

UserMapper.xml

<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE mapperPUBLIC "-//mybatis.org//DTD Mapper 3.0//EN""http://mybatis.org/dtd/mybatis-3-mapper.dtd"> <mapper namespace="cn.itcast.mybatis.mapper.UserMapper"><!-- <sql id="commonSql">id,user_name,password,name,age,sex,birthday,created,updated</sql> --><select id="loginByMap" resultType="User">select * from tb_user where user_name=#{userName} and password=#{password}</select><select id="login" resultType="User">select * from tb_user where user_name=#{userName} and password=#{password}</select><select id="queryUsersByTableName" resultType="User">select * from ${tableName}</select><select id="queryUserById" resultType="User" parameterType="long">select * from tb_user where id = #{id}</select><resultMap id="userMap" type="User" autoMapping="true"><id column="id" property="id"/></resultMap><select id="queryUserById1" resultMap="userMap">select * from tb_user where id = #{id}</select><select id="queryUserAll" resultType="User" >select * from tb_user</select><insert id="insertUser" parameterType="User">INSERT INTO tb_user (user_name,password,name,age,sex,birthday,created,updated)VALUES(#{userName},#{password},#{name},#{age},#{sex},#{birthday},NOW(),NOW());</insert><update id="updateUser" parameterType="User">UPDATE tb_userSETuser_name = #{userName},password = #{password},name = #{name},age = #{age},sex = #{sex},birthday = #{birthday},updated = NOW()WHERE(id = #{id});</update><delete id="deleteUserById" parameterType="java.lang.Long">delete from tb_user where id=#{id}</delete><select id="queryUsersLikeUserName" resultType="User"><!-- select <include refid="CommonSQL.commonSql"></include> from tb_user where user_name like '%' #{userName} '%'--><!-- if:判斷 test：OGNL表達(dá)式-->select * from tb_user where sex=3<if test="userName!=null and userName.trim()!=''">and user_name like '%' #{userName} '%'</if></select><select id="queryUserListLikeUserNameOrAge" resultType="User">select * from tb_user where sex=3<!-- choose:條件選擇when：test-判斷條件，一旦有一個(gè)when成立，后續(xù)的when都不再執(zhí)行otherwise：所有的when都不成立時(shí)，才會(huì)執(zhí)行--><choose><when test="userName!=null and userName.trim()!=''">and user_name like '%' #{userName} '%'</when><when test="age != null">and age = #{age}</when><otherwise>and user_name = 'zhangsan' </otherwise></choose></select><select id="queryUserListLikeUserNameAndAge" resultType="User">select * from tb_user<!--自動(dòng)添加where關(guān)鍵字有一定的糾錯(cuò)功能：去掉sql語句塊之前多余的一個(gè)and|or通常結(jié)合if或者choose使用--><where><if test="userName!=null and userName.trim()!=''">user_name like '%' #{userName} '%'</if><if test="age!=null">and age = #{age}</if></where></select><select id="queryUserListByIds" resultType="User">select * from tb_user where id in<!--foreach:遍歷集合collection：接收的集合參數(shù)item：遍歷的集合中的一個(gè)元素separator:分隔符open:以什么開始close：以什么結(jié)束--><foreach collection="ids" item="id" separator="," open="(" close=")">#{id}</foreach></select><update id="updateUserSelective">UPDATE tb_user<!--set自動(dòng)添加set關(guān)鍵字也有一定的糾錯(cuò)功能：自動(dòng)去掉sql語句塊之后多余的一個(gè)逗號(hào)--><set><if test="userName!=null and userName.trim()!=''">user_name = #{userName},</if><if test="password!=null and password.trim()!=''">password = #{password},</if><if test="name!=null and name.trim()!=''">name = #{name},</if><if test="age!=null">age = #{age},</if><if test="sex!=null">sex = #{sex},</if>updated = now(),</set>WHERE(id = #{id});</update></mapper>

User

package cn.itcast.mybatis.pojo;import java.util.Date;public class User {private Long id;// 用戶名private String userName;// 密碼private String password;// 姓名private String name;// 年齡private Integer age;// 性別，1男性，2女性private Integer sex;// 出生日期private Date birthday;// 創(chuàng)建時(shí)間private Date created;// 更新時(shí)間private Date updated;public Long getId() {return id;}public void setId(Long id) {this.id = id;}public String getUserName() {return userName;}public void setUserName(String userName) {this.userName = userName;}public String getPassword() {return password;}public void setPassword(String password) {this.password = password;}public String getName() {return name;}public void setName(String name) {this.name = name;}public Integer getAge() {return age;}public void setAge(Integer age) {this.age = age;}public Integer getSex() {return sex;}public void setSex(Integer sex) {this.sex = sex;}public Date getBirthday() {return birthday;}public void setBirthday(Date birthday) {this.birthday = birthday;}public Date getCreated() {return created;}public void setCreated(Date created) {this.created = created;}public Date getUpdated() {return updated;}public void setUpdated(Date updated) {this.updated = updated;}@Overridepublic String toString() {return "User [id=" + id + ", userName=" + userName + ", password=" + password + ", name=" + name+ ", age=" + age + ", sex=" + sex + ", birthday=" + birthday + ", created=" + created+ ", updated=" + updated + "]";}}

UserMapperTest

package cn.itcast.mybatis.mapper;import cn.itcast.mybatis.pojo.User; import org.apache.ibatis.io.Resources; import org.apache.ibatis.session.SqlSession; import org.apache.ibatis.session.SqlSessionFactory; import org.apache.ibatis.session.SqlSessionFactoryBuilder; import org.junit.Before; import org.junit.Test;import java.io.InputStream; import java.util.Date; import java.util.HashMap; import java.util.List; import java.util.Map;public class UserMapperTest {private UserMapper userMapper;@Beforepublic void setUp() throws Exception { // 讀取mybatis的全局配置文件InputStream inputStream = Resources.getResourceAsStream("mybatis-config.xml");// 構(gòu)建sqlSessionFactorySqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream,"test");// 獲取sqlSession會(huì)話, true 表示自動(dòng)提交事務(wù)SqlSession sqlSession = sqlSessionFactory.openSession(true);// 初始化userDaothis.userMapper = sqlSession.getMapper(UserMapper.class);}@Testpublic void testQueryUsersLikeUserName(){List<User> users = this.userMapper.queryUsersLikeUserName("rick");for (User user : users) {System.out.println(user);}}@Testpublic void testMap(){Map<String,Object> map = new HashMap<>();map.put("userName", "zhangsan");map.put("password", "00000");System.out.println(this.userMapper.loginByMap(map));}@Testpublic void testLogin(){System.out.println(this.userMapper.login("lisi", "456"));}@Testpublic void testQueryUsersByTableName(){List<User> users = this.userMapper.queryUsersByTableName("tb_user");for (User user : users) {System.out.println(user);}}@Testpublic void queryUserById() {User user = this.userMapper.queryUserById1(1L);System.out.println(user);}@Testpublic void testQueryUserAll() {List<User> userList = this.userMapper.queryUserAll();for (User user : userList) {System.out.println(user);}}@Testpublic void testQueryUserListLikeUserNameOrAge(){List<User> users = this.userMapper.queryUserListLikeUserNameOrAge(null, 18);for (User user : users) {System.out.println(user);}}@Testpublic void testQueryUserListLikeUserNameAndAge(){List<User> users = this.userMapper.queryUserListLikeUserNameAndAge("yanyan", 18);for (User user : users) {System.out.println(user);}}@Testpublic void testUpdateUserSelective(){User user = new User();user.setAge(16);user.setName("Lydia");user.setPassword("789");user.setUserName("yanyan2");user.setSex(3);user.setBirthday(new Date());user.setId(11L);this.userMapper.updateUserSelective(user);}@Testpublic void testQueryUserListByIds(){List<User> users = this.userMapper.queryUserListByIds(new Long[]{1L,2L,3L,4L});for (User user : users) {System.out.println(user);}}}

mybatis-config.xml

<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE configurationPUBLIC "-//mybatis.org//DTD Config 3.0//EN""http://mybatis.org/dtd/mybatis-3-config.dtd"> <configuration><!-- 引入外部資源文件，resource：相對(duì)路徑，url：絕對(duì)路徑 --><properties resource="jdbc.properties"/><settings><setting name="mapUnderscoreToCamelCase" value="true"/></settings><typeAliases><!-- <typeAlias type="cn.itcast.mybatis.pojo.User" alias="user"/> --><package name="cn.itcast.mybatis.pojo"/></typeAliases><environments default="test"><environment id="development"><transactionManager type="JDBC"/><dataSource type="POOLED"><property name="driver" value="${jdbc.driver}"/><property name="url" value="${jdbc.url}"/><property name="username" value="${jdbc.username}"/><property name="password" value="${jdbc.password}"/></dataSource></environment><environment id="test"><transactionManager type="JDBC"/><dataSource type="POOLED"><property name="driver" value="${jdbc.driver}"/><property name="url" value="${jdbc.url}"/><property name="username" value="${jdbc.username}"/><property name="password" value="${jdbc.password}"/></dataSource></environment></environments><mappers><mapper resource="UserMapper.xml"/><mapper resource="UserDaoMapper.xml"/><mapper resource="CommonSQL.xml"/><!-- <mapper class="cn.itcast.mybatis.mapper.UserMapper"/><package name="cn.itcast.mybatis.mapper"/> --></mappers> </configuration>

jdbc.properties

jdbc.driver = com.mysql.jdbc.Driver jdbc.url = jdbc:mysql:///user_manager jdbc.username = root jdbc.password = root

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