崔小伟作业

崔小伟_Mybatis1/entity.sql

+/*
+/*
+Navicat MySQL Data Transfer
+
+Source Server         : localhost_3306
+Source Server Version : 80013
+Source Host           : localhost:3306
+Source Database       : test
+
+Target Server Type    : MYSQL
+Target Server Version : 80013
+File Encoding         : 65001
+
+Date: 2019-12-09 16:34:49
+*/
+
+SET FOREIGN_KEY_CHECKS=0;
+
+-- ----------------------------
+-- Table structure for city
+-- ----------------------------
+DROP TABLE IF EXISTS `entity`;
+CREATE TABLE `entity` (
+  `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;

崔小伟_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.example</groupId>
+    <artifactId>demo</artifactId>
+    <version>0.0.1-SNAPSHOT</version>
+    <name>demo</name>
+    <description>Demo project for Spring Boot</description>
+
+    <properties>
+        <java.version>1.8</java.version>
+    </properties>
+
+
+    <dependencies>
+        <dependency>
+            <groupId>org.mybatis.spring.boot</groupId>
+            <artifactId>mybatis-spring-boot-starter</artifactId>
+            <version>2.1.1</version>
+        </dependency>
+        <dependency>
+            <groupId>mysql</groupId>
+            <artifactId>mysql-connector-java</artifactId>
+            <scope>runtime</scope>
+        </dependency>
+        <dependency>
+            <groupId>cn.hutool</groupId>
+            <artifactId>hutool-all</artifactId>
+            <version>4.6.4</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>

崔小伟_Mybatis1/src/main/java/com/example/demo/DemoApplication.java

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

崔小伟_Mybatis1/src/main/java/com/example/demo/mybatis/BatchService.java

+package com.example.demo.mybatis;
+package com.example.demo.mybatis;
+
+
+import cn.hutool.core.lang.Console;
+import cn.hutool.core.util.IdUtil;
+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;
+
+/**
+ * <p>
+ *
+ * </p>
+ *
+ * @author shyane
+ * @date 2019/12/9
+ */
+@Service
+public class BatchService {
+    private SqlSession sqlSession;
+
+    public BatchService(SqlSessionFactory sqlSessionFactory) {
+        sqlSession = new SqlSessionTemplate(sqlSessionFactory, ExecutorType.BATCH);
+    }
+
+    public int batchInsertCity(List<Entity> entities) {
+        EntityMapper entityMapper = sqlSession.getMapper(EntityMapper.class);
+        //批量保存执行前时间
+        long start = System.currentTimeMillis();
+        for (Entity entity : entities) {
+            entity.setId(IdUtil.simpleUUID());
+            entity.setName("ces");
+            entityMapper.insert(entity);
+        }
+        long end = System.currentTimeMillis();
+        long time = end - start;
+        //批量保存执行后的时间
+        Console.log("批量执行时长" + time);
+        return cities.size();
+    }
+}

崔小伟_Mybatis1/src/main/java/com/example/demo/mybatis/Entity.java

+package com.example.demo.mybatis;
+package com.example.demo.mybatis;
+
+import java.util.Map;
+/**
+ * <p>
+ *
+ * </p>
+ *
+ * @author shyane
+ * @date 2019/12/9
+ */
+public class Entity {
+
+    private String id;
+    private String name;
+    private Map<String,Object> context;
+
+    public String getId() {
+        return id;
+    }
+
+    public Entity setId(String id) {
+        this.id = id;
+        return this;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public Entity setName(String name) {
+        this.name = name;
+        return this;
+    }
+
+    public Map<String, Object> getContext() {
+        return context;
+    }
+
+    public Entity setContext(Map<String, Object> context) {
+        this.context = context;
+        return this;
+    }
+
+    @Override
+    public String toString() {
+        return "Entity{" +
+                "id='" + id + '\'' +
+                ", name='" + name + '\'' +
+                ", context=" + context +
+                '}';
+    }
+}

崔小伟_Mybatis1/src/main/java/com/example/demo/mybatis/EntityMapper.java

+package com.example.demo.mybatis;
+package com.example.demo.mybatis;
+
+
+import org.apache.ibatis.annotations.Insert;
+import org.apache.ibatis.annotations.Mapper;
+import org.apache.ibatis.annotations.Select;
+/**
+ * <p>
+ *
+ * </p>
+ *
+ * @author shyane
+ * @date 2019/12/9
+ */
+@Mapper
+public interface EntityMapper {
+
+    @Insert("INSERT INTO entity (id, name, context) VALUES(#{id}, #{name}, #{context})")
+    void insert(Entity entity);
+
+    @Select("SELECT id, name, context FROM entity WHERE id = #{id}")
+    City findById(String id);
+
+}

崔小伟_Mybatis1/src/main/java/com/example/demo/mybatis/MapTypeHandler.java

+package com.example.demo.mybatis;
+package com.example.demo.mybatis;
+
+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;
+
+/**
+ * <p>
+ *      map类型转换器
+ * </p>
+ *
+ * @author shyane
+ * @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);
+    }
+}

崔小伟_Mybatis1/src/main/java/com/example/demo/mybatis/MyBatisConfig.java

+package com.example.demo.mybatis;
+package com.example.demo.mybatis;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+/**
+ * <p>
+ *
+ * </p>
+ *
+ * @author shyane
+ * @date 2019/12/9
+ */
+@Configuration
+public class MyBatisConfig {
+    @Bean
+    MapTypeHandler mapTypeHandler() {
+        return new MapTypeHandler();
+    }
+
+}

崔小伟_Mybatis1/src/main/resources/application.properties

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

崔小伟_Mybatis1/src/test/java/com/example/demo/DemoApplicationTests.java

+package com.example.demo;
+package com.example.demo;
+
+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.example.demo.mybatis.BatchService;
+import com.example.demo.mybatis.Entity;
+import com.example.demo.mybatis.EntityMapper;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+
+import javax.annotation.Resource;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+@SpringBootTest
+class DemoApplicationTests {
+
+    @Resource
+    private EntityMapper entityMapper;
+    @Autowired
+    private BatchService batchService;
+
+    //                   测试类型转换
+    @Test
+    void contextLoads() {
+        Entity entity = new Entity();
+        Map<String, Object> context = new HashMap<>();
+        context.put("111", "111");
+        context.put("222", "222");
+        context.put("333", "333");
+        context.put("444", "444");
+        entity.setId(IdUtil.simpleUUID())
+                .setName(RandomUtil.randomString(4))
+                .setContext(context);
+        entityMapper.insert(entity);
+    }
+
+    @Test
+    void select() {
+        Entity id = entityMapper.findById("de7b193a8d6aa6aw73w46a5vb6");
+        Console.log(id);
+        Console.log(JSONUtil.toJsonStr(id));
+    }
+
+    //                   测试批量处
+    @Test
+    void batch() {
+        List<Entity> entities = new ArrayList<Entity>();
+        for (int i = 0; i < 10000; i++) {
+            Entity entity = new Entity();
+            entity.setName(RandomUtil.randomString("ces测试", 4));
+            entities.add(entity);
+        }
+        batchService.batchInsertEntity(entities);
+
+        this.noBath(entities);
+    }
+
+    void noBath(List<Entity> entities) {
+        //批量保存执行前时间
+        long start = System.currentTimeMillis();
+        for (Entity entity : entities) {
+            entity.setId(IdUtil.simpleUUID());
+            entityMapper.insert(entity);
+        }
+        long end = System.currentTimeMillis();
+        long time2 = end - start;
+        //批量保存执行后的时间
+        Console.log("执行时长" + time2);
+    }
+
+
+}