逆向工程

1、逆向工程

1.一、概述

mybatis須要程序號本身編寫的SQL。

mybatis官方提供了逆向工程，能夠針對單表自動生成mybatis執行所須要的代碼

（mapper,java,maper.xml,po...)

通常都是由數據庫到java代碼， 的生成過程

2、導入jar包

2.一、mybatis-generator

 

 

3、配置xml

3.一、generatorConfig.xml

 

<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE generatorConfiguration PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN" "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd"> <generatorConfiguration> <!--指定數據庫jar包 --> <classPathEntry location="G:/jar/mysql-connector-java-5.1.37-bin.jar" /> <context id="DB2Tables" targetRuntime="MyBatis3"> <commentGenerator> <!-- 是否去除自動生成的註釋 true：是 ： false:否 --> <property name="suppressAllComments" value="true" /> </commentGenerator> <!--JDBC鏈接配置，driver,url,user,password --> <jdbcConnection driverClass="com.mysql.jdbc.Driver" connectionURL="jdbc:mysql://localhost:3306/mybatis?character=utf8" userId="root" password="root"> </jdbcConnection> <!--默認false，把JDBC DECIMAL 和 NUMERIC 類型解析爲 Integer，爲 true時把JDBC DECIMAL 和 NUMERIC 類型解析爲java.math.BigDecimal --> <javaTypeResolver> <property name="forceBigDecimals" value="false" /> </javaTypeResolver> <!-- targetProject:生成PO類的位置 --> <javaModelGenerator targetPackage="com.mybatis.po" targetProject=".\src"> <property name="enableSubPackages" value="false" /> <property name="trimStrings" value="true" /> </javaModelGenerator> <!-- targetProject:mapper映射文件生成的位置 --> <sqlMapGenerator targetPackage="com.pb.mybatis.mapping" targetProject=".\src"> <!-- enableSubPackages:是否讓schema做爲包的後綴 --> <property name="enableSubPackages" value="false" /> <!-- 從數據庫返回的值被清理先後的空格 --> <property name="trimStrings" value="true" /> </sqlMapGenerator> <!-- targetPackage：mapper接口生成的位置 --> <javaClientGenerator type="XMLMAPPER" targetPackage="com.pb.mybatis.mapper" targetProject=".\src"> <!-- enableSubPackages:是否讓schema做爲包的後綴 --> <property name="enableSubPackages" value="false" /> </javaClientGenerator> <!--指定要生成的表 --> <table tableName="author"></table> <table tableName="blog"></table> <table tableName="posts"></table> </context> </generatorConfiguration>

 

 

 

 

 

4、運行java程序生成

4.一、java程序

 

import java.io.File; import java.io.IOException; import java.util.ArrayList; import java.util.List; import org.mybatis.generator.api.MyBatisGenerator; import org.mybatis.generator.config.Configuration; import org.mybatis.generator.config.xml.ConfigurationParser; import org.mybatis.generator.exception.XMLParserException; import org.mybatis.generator.internal.DefaultShellCallback; public class GeneratorSqlmap { public void generator() throws Exception{ List<String> warnings = new ArrayList<String>(); boolean overwrite = true; //指定 逆向工程配置文件 File configFile = new File("generatorConfig.xml"); ConfigurationParser cp = new ConfigurationParser(warnings); Configuration config = cp.parseConfiguration(configFile); DefaultShellCallback callback = new DefaultShellCallback(overwrite); MyBatisGenerator myBatisGenerator = new MyBatisGenerator(config, callback, warnings); myBatisGenerator.generate(null); } public static void main(String[] args) throws Exception { try { GeneratorSqlmap generatorSqlmap = new GeneratorSqlmap(); generatorSqlmap.generator(); } catch (Exception e) { e.printStackTrace(); } } }

 

 

5、測試

5.一、測試類

 

package com.pb.ssm.mapper; import static org.junit.Assert.fail; import java.util.Date; import java.util.List; import javax.crypto.Cipher; import org.junit.Before; import org.junit.Test; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; import com.pb.ssm.po.Author; import com.pb.ssm.po.AuthorExample; import com.pb.ssm.po.AuthorExample.Criteria; public class AuthorMapperTest { private ApplicationContext applicationContext; private AuthorMapper authorMapper; @Before public void setUp() throws Exception { applicationContext=new ClassPathXmlApplicationContext("ApplicationContext.xml"); authorMapper=(AuthorMapper) applicationContext.getBean("authorMapper"); } //根據條件查詢記錄數  @Test public void testCountByExample() { AuthorExample example=new AuthorExample(); //能夠加條件，不加條件默認查詢所有 Criteria criteria=example.createCriteria(); //加條件，介紹不是空的  criteria.andAuthorBioIsNotNull(); int num=authorMapper.countByExample(example); System.out.println("num="+num); } //根據條件刪除  @Test public void testDeleteByExample() { AuthorExample example=new AuthorExample(); //能夠加條件，不加條件默認查詢所有 Criteria criteria=example.createCriteria(); criteria.andAuthorUsernameEqualTo("程序員"); int num=authorMapper.deleteByExample(example); System.out.println("num="+num); } //根據主鍵ID刪除  @Test public void testDeleteByPrimaryKey() { int num=authorMapper.deleteByPrimaryKey(18); System.out.println("num="+num); } //插入  @Test public void testInsert() { Author author=new Author(); author.setAuthorUsername("再測試一下"); author.setAuthorPassword("admin123"); author.setAuthorEmail("admin1234@qq.com"); int num=authorMapper.insert(author); System.out.println("num="+num); //這個方法插入，默認不會把數據庫自增長ID返回，若是須要，能夠手動增長 System.out.println("插入後的ID"+author.getAuthorId()); } //插入  @Test public void testInsertSelective() { Author author=new Author(); author.setAuthorUsername("再測試一下"); author.setAuthorPassword("admin123"); author.setAuthorEmail("admin1234@qq.com"); author.setRegisterTime(new Date()); int num=authorMapper.insert(author); System.out.println("num="+num); //這個方法插入，默認不會把數據庫自增長ID返回，若是須要，能夠手動增長 System.out.println("插入後的ID"+author.getAuthorId()); } //自定義 條件查詢  @Test public void testSelectByExample() { //聲明一個對象 AuthorExample authorExample=new AuthorExample(); //建立criteria對象添加條件 and 鏈接 Criteria criteria=authorExample.createCriteria(); //須要手動加% criteria.andAuthorUsernameLike("%張三%"); List<Author> list=authorMapper.selectByExample(authorExample); System.out.println(list.size()); } //根據主鍵ID查詢  @Test public void testSelectByPrimaryKey() { Author author= authorMapper.selectByPrimaryKey(6); System.out.println(author.getAuthorUsername()+"..."+author.getAuthorBio()); } @Test public void testUpdateByExampleSelective() { fail("Not yet implemented"); } @Test public void testUpdateByExample() { fail("Not yet implemented"); } @Test public void testUpdateByPrimaryKeySelective() { fail("Not yet implemented"); } @Test public void testUpdateByPrimaryKey() { fail("Not yet implemented"); } }