简单了解mybatis的****

1.引入依赖

<!-- ****核心jar -->
    <dependency>
      <groupId>org.mybatis.generator</groupId>
      <artifactId>mybatis-generator-core</artifactId>
      <version>1.3.7</version>
    </dependency>
    <!--连接数据库-->
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>5.1.34</version>
    </dependency>

2.编写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>
    <!-- ojdbc的jar包 -->
    <classPathEntry
            location="C:\Users\Administrator\.m2\repository\mysql\mysql-connector-java\5.1.34\mysql-connector-java-5.1.34.jar" />
    <context id="my" targetRuntime="MyBatis3">
        <commentGenerator>
            <property name="suppressDate" value="false" />
            <!--是否自动去除注释-->
            <property name="suppressAllComments" value="true" />
        </commentGenerator>
        <!-- 数据库连接信息 -->
        <!--         <jdbcConnection driverClass="oracle.jdbc.driver.OracleDriver" -->
        <!--             connectionURL="jdbc:oracle:thin:@192.168.1.112:1521:orcl" userId="KY" -->
        <!--             password="KY" /> -->
        <jdbcConnection driverClass="com.mysql.jdbc.Driver"
                        connectionURL="jdbc:mysql://localhost:3306/cmfz" userId="root"
                        password="hr" />
        <!-- model生成路径 -->
        <javaModelGenerator targetPackage="com.luf.cmfz.entity"
                            targetProject="E:\nixianggongcheng\src\main\java">
            <property name="enableSubPackages" value="true" />
            <property name="trimStrings" value="true" />
        </javaModelGenerator>
        <!-- 映射xml文件生成路径 -->
        <sqlMapGenerator targetPackage="mapper"
                         targetProject="E:\nixianggongcheng\src\main\resources">
            <property name="enableSubPackages" value="false" />
        </sqlMapGenerator>
        <!-- 和xml文件关联的dao生成路径（生成文件名默认是***Mapper.java，习惯将其改名成 ***Dao.java） -->
        <javaClientGenerator targetPackage="com.luf.cmfz.dao"
                             targetProject="E:\nixianggongcheng\src\main\java" type="XMLMAPPER">
            <property name="enableSubPackages" value="true" />
        </javaClientGenerator>

        <!--   目标表，如果有多个表就将此段拷贝分别配置-->
        <table tableName="cmfz_admin" domainObjectName="AdminInfo"
               enableCountByExample="false" enableUpdateByExample="false"
               enableDeleteByExample="false" enableSelectByExample="false"
               selectByExampleQueryId="false">
        </table>

    </context>
</generatorConfiguration>

3.开始生成

（1）利用主函数生成

import java.io.File;
import java.util.*;
 
import org.mybatis.generator.api.MyBatisGenerator;
import org.mybatis.generator.config.Configuration;
import org.mybatis.generator.config.xml.ConfigurationParser;
import org.mybatis.generator.internal.DefaultShellCallback;
 
public class GeneratorSqlmap {
 
	public void generator() throws Exception {
		List<String> warnings = new ArrayList<String>();
		boolean overwrite = true;
		// 指定配置文件
		File configFile = new File("generatorConfig.xml的路径");
		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);
	}
 
	// 执行main方法以生成代码
	public static void main(String[] args) {
		try {
			GeneratorSqlmap generatorSqlmap = new GeneratorSqlmap();
			generatorSqlmap.generator();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}

（2）利用插件生成

  <properties>
    <mybatis.generator.version>1.3.2</mybatis.generator.version>
  </properties>
  <build>
    
    <plugins>
      <!--mybaits****-->
      <plugin>
        <groupId>org.mybatis.generator</groupId>
        <artifactId>mybatis-generator-maven-plugin</artifactId>
        <version>${mybatis.generator.version}</version>
        <configuration>
          <verbose>true</verbose>
          <overwrite>true</overwrite>
        </configuration>
      </plugin>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-war-plugin</artifactId>
        <configuration>
          <failOnMissingWebXml>false</failOnMissingWebXml>
          <warName>ROOT</warName>
        </configuration>
      </plugin>
    </plugins>
  </build>