李尚昆作业

李尚昆_Mybatis1/pom.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <parent>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-starter-parent</artifactId>
+        <version>2.2.2.RELEASE</version>
+        <relativePath/> <!-- lookup parent from repository -->
+    </parent>
+    <groupId>com.cesgroup</groupId>
+    <artifactId>springboot-mybatis</artifactId>
+    <version>0.0.1-SNAPSHOT</version>
+    <name>springboot-mybatis</name>
+    <description>Demo project for Spring Boot</description>
+
+    <properties>
+        <java.version>1.8</java.version>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-web</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.mybatis.spring.boot</groupId>
+            <artifactId>mybatis-spring-boot-starter</artifactId>
+            <version>2.1.1</version>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-jdbc</artifactId>
+        </dependency>
+
+
+        <dependency>
+            <groupId>org.projectlombok</groupId>
+            <artifactId>lombok</artifactId>
+            <optional>true</optional>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+
+
+    <dependency>
+            <groupId>mysql</groupId>
+            <artifactId>mysql-connector-java</artifactId>
+            <scope>runtime</scope>
+        </dependency>
+        <dependency>
+            <groupId>cn.hutool</groupId>
+            <artifactId>hutool-all</artifactId>
+            <version>4.5.16</version>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+            <exclusions>
+                <exclusion>
+                    <groupId>org.junit.vintage</groupId>
+                    <artifactId>junit-vintage-engine</artifactId>
+                </exclusion>
+            </exclusions>
+        </dependency>
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>4.12</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+            </plugin>
+        </plugins>
+    </build>
+
+</project>

李尚昆_Mybatis1/readme.md

+执行测试类：`com.cesgroup.homwork.mybatis.MybatisApplicationTests`
+执行测试类：`com.cesgroup.homwork.mybatis.MybatisApplicationTests`
\ No newline at end of file

李尚昆_Mybatis1/sql/user.sql

+
+
+
+SET FOREIGN_KEY_CHECKS=0;
+
+-- ----------------------------
+-- Table structure for user
+-- ----------------------------
+DROP TABLE IF EXISTS `user`;
+CREATE TABLE `user` (
+  `id` varchar(32) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NOT NULL,
+  `name` varchar(255) DEFAULT NULL,
+  `context` varchar(1000) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci DEFAULT NULL,
+  PRIMARY KEY (`id`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci;

李尚昆_Mybatis1/src/main/java/com/cesgroup/homwork/mybatis/MybatisApplication.java

+package com.cesgroup.homwork.mybatis;
+package com.cesgroup.homwork.mybatis;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class MybatisApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(MybatisApplication.class, args);
+    }
+
+}

李尚昆_Mybatis1/src/main/java/com/cesgroup/homwork/mybatis/sample/config/MyBatisConfig.java

+package com.cesgroup.homwork.mybatis.sample.config;
+package com.cesgroup.homwork.mybatis.sample.config;
+
+import com.cesgroup.homwork.mybatis.sample.type.MapTypeHandler;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+public class MyBatisConfig {
+  @Bean
+  MapTypeHandler mapTypeHandler() {
+    return new MapTypeHandler();
+  }
+
+}
\ No newline at end of file

李尚昆_Mybatis1/src/main/java/com/cesgroup/homwork/mybatis/sample/entity/User.java

+package com.cesgroup.homwork.mybatis.sample.entity;
+package com.cesgroup.homwork.mybatis.sample.entity;
+
+import java.util.Map;
+
+/**
+ *
+ */
+public class User {
+
+    private String id;
+    private String name;
+    private Map<String,Object> context;
+
+    public String getId() {
+        return id;
+    }
+
+    public User setId(String id) {
+        this.id = id;
+        return this;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public User setName(String name) {
+        this.name = name;
+        return this;
+    }
+
+    public Map<String, Object> getContext() {
+        return context;
+    }
+
+    public User setContext(Map<String, Object> context) {
+        this.context = context;
+        return this;
+    }
+
+    @Override
+    public String toString() {
+        return "User{" +
+                "id='" + id + '\'' +
+                ", name='" + name + '\'' +
+                ", context=" + context +
+                '}';
+    }
+}
\ No newline at end of file

李尚昆_Mybatis1/src/main/java/com/cesgroup/homwork/mybatis/sample/mapper/UserMapper.java

+package com.cesgroup.homwork.mybatis.sample.mapper;
+package com.cesgroup.homwork.mybatis.sample.mapper;
+
+import com.cesgroup.homwork.mybatis.sample.entity.User;
+import org.apache.ibatis.annotations.Insert;
+import org.apache.ibatis.annotations.Mapper;
+import org.apache.ibatis.annotations.Select;
+
+@Mapper
+public interface UserMapper {
+
+  @Insert("INSERT INTO USER (id, name, context) VALUES(#{id}, #{name}, #{context})")
+  void insert(User user);
+
+  @Select("SELECT id, name, context FROM USER WHERE id = #{id}")
+  User findById(String id);
+
+}
\ No newline at end of file

李尚昆_Mybatis1/src/main/java/com/cesgroup/homwork/mybatis/sample/service/BatchService.java

+package com.cesgroup.homwork.mybatis.sample.service;
+package com.cesgroup.homwork.mybatis.sample.service;
+
+import cn.hutool.core.lang.Console;
+import cn.hutool.core.util.IdUtil;
+import com.cesgroup.homwork.mybatis.sample.entity.User;
+import com.cesgroup.homwork.mybatis.sample.mapper.UserMapper;
+import org.apache.ibatis.session.ExecutorType;
+import org.apache.ibatis.session.SqlSession;
+import org.apache.ibatis.session.SqlSessionFactory;
+import org.mybatis.spring.SqlSessionTemplate;
+import org.springframework.stereotype.Service;
+
+import java.util.List;
+
+/**
+ * 批量sql处理类
+ * @author li.shangkun
+ * @date 2019/12/9
+ */
+@Service
+public class BatchService {
+    private SqlSession sqlSession;
+
+    public BatchService(SqlSessionFactory sqlSessionFactory) {
+        sqlSession = new SqlSessionTemplate(sqlSessionFactory,ExecutorType.BATCH) ;
+    }
+
+    public int batchInsertUser(List<User> users){
+        UserMapper UserMapper = sqlSession.getMapper(UserMapper.class);
+        //批量保存执行前时间
+        long start=System.currentTimeMillis();
+        for (User user : users) {
+            user.setId(IdUtil.simpleUUID());
+            UserMapper.insert(user);
+        }
+        long end=  System.currentTimeMillis();
+        long time2= end-start;
+        //批量保存执行后的时间
+        Console.log("批量执行时长"+time2);
+        return users.size();
+    }
+}

李尚昆_Mybatis1/src/main/java/com/cesgroup/homwork/mybatis/sample/type/MapTypeHandler.java

+package com.cesgroup.homwork.mybatis.sample.type;
+package com.cesgroup.homwork.mybatis.sample.type;
+
+import cn.hutool.json.JSONUtil;
+import org.apache.ibatis.type.BaseTypeHandler;
+import org.apache.ibatis.type.JdbcType;
+
+import java.sql.CallableStatement;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.Map;
+/**
+ * map类型转换器
+ * @author li.shangkun
+ * @date 2019/12/9
+ */
+public class MapTypeHandler extends BaseTypeHandler<Map> {
+    public MapTypeHandler() {
+    }
+
+    @Override
+    public void setNonNullParameter(PreparedStatement ps, int i, Map map, JdbcType jdbcType) throws SQLException {
+        ps.setString(i,JSONUtil.toJsonStr(map));
+    }
+
+    @Override
+    public Map getNullableResult(ResultSet rs, String columnName) throws SQLException {
+        String result = rs.getString(columnName);
+        return rs.wasNull() ? null : JSONUtil.parseObj(result);
+    }
+    @Override
+    public Map getNullableResult(ResultSet rs, int columnIndex) throws SQLException {
+        String result = rs.getString(columnIndex);
+        return  rs.wasNull() ? null : JSONUtil.parseObj(result);
+    }
+    @Override
+    public Map getNullableResult(CallableStatement cs, int columnIndex) throws SQLException {
+        String result = cs.getString(columnIndex);
+        return cs.wasNull() ? null : JSONUtil.parseObj(result);
+    }
+}
\ No newline at end of file

李尚昆_Mybatis1/src/main/resources/application.properties

+
+
+
+spring.datasource.url=jdbc:mysql://127.0.0.1:3306/testUser?serverTimezone=GMT-8
+spring.datasource.driver-class-name=com.mysql.jdbc.Driver
+spring.datasource.username=root
+spring.datasource.password=1234
+
+
+mybatis.type-aliases-package=com.cesgroup.homwork.mybatis
+mybatis.configuration.map-underscore-to-camel-case=true
+mybatis.configuration.default-fetch-size=100
+mybatis.configuration.default-statement-timeout=30

李尚昆_Mybatis1/src/test/java/com/cesgroup/homwork/mybatis/MybatisApplicationTests.java

+package com.cesgroup.homwork.mybatis;
+package com.cesgroup.homwork.mybatis;
+
+import cn.hutool.core.lang.Console;
+import cn.hutool.core.util.IdUtil;
+import cn.hutool.core.util.RandomUtil;
+import cn.hutool.json.JSONUtil;
+import com.cesgroup.homwork.mybatis.sample.entity.User;
+import com.cesgroup.homwork.mybatis.sample.mapper.UserMapper;
+import com.cesgroup.homwork.mybatis.sample.service.BatchService;
+import org.junit.jupiter.api.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.context.junit4.SpringRunner;
+
+import javax.annotation.Resource;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+@RunWith(SpringRunner.class)
+@SpringBootTest
+class MybatisApplicationTests {
+
+    @Resource
+    private UserMapper UserMapper;
+    @Autowired
+    private BatchService batchService;
+    @Test
+    void contextLoads() {
+        User user = new User();
+        Map<String, Object> context = new HashMap<>();
+        context.put("a","张三");
+        context.put("b","李四");
+        context.put("c","哈哈");
+        context.put("d","嘻嘻");
+        user.setId(IdUtil.simpleUUID())
+//                .setId("857b193a846a4246a2087358daa9c9b6")
+                .setName(RandomUtil.randomString(4))
+                .setContext(context);
+        UserMapper.insert(user);
+    }
+    
+    @Test
+    void select() {
+        User byId = UserMapper.findById("857b193a846a4246a2087358daa9c9b6");
+        Console.log(byId);
+        Console.log(JSONUtil.toJsonStr(byId));
+    }
+
+
+    @Test
+    void batch() {
+        List<User> cities = new ArrayList<User>();
+        for (int i = 0; i < 10000; i++) {
+            User user = new User();
+            user.setName(RandomUtil.randomString("哈哈哈哈！",4));
+            cities.add(user);
+        }
+        batchService.batchInsertUser(cities);
+
+        this.noBath(cities);
+    }
+    void noBath(List<User> cities){
+        //批量保存执行前时间
+        long start=System.currentTimeMillis();
+        for (User user : cities) {
+            user.setId(IdUtil.simpleUUID());
+            UserMapper.insert(user);
+        }
+        long end=  System.currentTimeMillis();
+        long time2= end-start;
+        //批量保存执行后的时间
+        Console.log("非批量执行时长"+time2);
+    }
+}

李尚昆_Mybatis1/target/classes/application.properties

+
+
+
+spring.datasource.url=jdbc:mysql://127.0.0.1:3306/testUser?serverTimezone=GMT-8
+spring.datasource.driver-class-name=com.mysql.jdbc.Driver
+spring.datasource.username=root
+spring.datasource.password=1234
+
+
+mybatis.type-aliases-package=com.cesgroup.homwork.mybatis
+mybatis.configuration.map-underscore-to-camel-case=true
+mybatis.configuration.default-fetch-size=100
+mybatis.configuration.default-statement-timeout=30