林炳文Evankaka原创作品。转载请注明出处http://blog.csdn.net/evankaka
摘要：本文将简要介绍怎样利用Mybatis Generator自动生成Mybatis的相关代码，Mybatis Generator是一个非常好用的工具，使用它可以大大节省开发的时间，并减少代码的编写量。
一、构建一个环境
1. 首先创建一个表：
CREATE TABLE t_user
(
USER_ID INT NOT NULL AUTO_INCREMENT,
USER_NAME CHAR(30) NOT NULL,
USER_PASSWORD CHAR(10) NOT NULL,
USER_EMAIL CHAR(30) NOT NULL,
PRIMARY KEY (USER_ID)
)
ENGINE=InnoDB DEFAULT CHARSET=utf8;
2. 在 Mybatis 主页 http://code.google.com/p/mybatis/ 上下载 Mybatis mybatis-generator-core 或者在这里下载：http://download.csdn.net/detail/evankaka/8926999
二、xml文件编写
1、新建一个工程。然后新建如下包，都是空的
2、然后新建generator.xmll文件
内容如下：
<?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> <!-- classPathEntry:数据库的JDBC驱动的jar包地址 --> <classPathEntry location="D:\Java\Jar\mysql-connector-java-5.1.22\mysql-connector-java-5.1.22-bin.jar" /> <context id="DB2Tables" targetRuntime="MyBatis3"> <commentGenerator> <!-- 抑制警告 --> <property name="suppressTypeWarnings" value="true" /> <!-- 是否去除自动生成的注释 true：是 ： false:否 --> <property name="suppressAllComments" value="false" /> <!-- 是否生成注释代时间戳--> <property name="suppressDate" value="true" /> </commentGenerator> <!--数据库连接的信息：驱动类、连接地址、用户名、密码 --> <jdbcConnection driverClass="com.mysql.jdbc.Driver" connectionURL="jdbc:mysql://localhost/learning" userId="root" password="christmas258@"> </jdbcConnection> <!-- 默认false，把JDBC DECIMAL 和 NUMERIC 类型解析为 Integer true，把JDBC DECIMAL 和 NUMERIC 类型解析为java.math.BigDecimal --> <!-- <javaTypeResolver> <property name="forceBigDecimals" value="false" /> </javaTypeResolver> --> <!--生成Model类存放位置 --> <javaModelGenerator targetPackage="com.lin.domain" targetProject="D:\lunaJee-workspace\MyBatisLearningChapter7\src"> <!-- 是否在当前路径下新加一层schema,eg：fase路径com.oop.eksp.user.model， true:com.oop.eksp.user.model.[schemaName] --> <property name="enableSubPackages" value="false" /> <!-- 是否针对string类型的字段在set的时候进行trim调用 --> <property name="trimStrings" value="true" /> </javaModelGenerator> <!--生成映射文件存放位置 --> <sqlMapGenerator targetPackage="com.lin.mapper" targetProject="D:\lunaJee-workspace\MyBatisLearningChapter7\src"> <property name="enableSubPackages" value="true" /> </sqlMapGenerator> <!--生成Dao类存放位置 --> <javaClientGenerator type="XMLMAPPER" targetPackage="com.lin.dao" targetProject="D:\lunaJee-workspace\MyBatisLearningChapter7\src"> <property name="enableSubPackages" value="true" /> </javaClientGenerator> <!-- tableName:用于自动生成代码的数据库表；domainObjectName:对应于数据库表的javaBean类名 --> <table schema="general" tableName="T_USER" domainObjectName="User"> <!--domain字段的命名规则，false:默认为驼峰命名 true:按数据库真实命名 --> <property name="useActualColumnNames" value="false"/> <!-- 忽略列，不生成bean 字段 --> <!-- <ignoreColumn column="FRED" /> --> <!-- 指定列的java数据类型 --> <!-- <columnOverride column="LONG_VARCHAR_FIELD" jdbcType="VARCHAR" /> --> </table> </context></generatorConfiguration>
三、自动代码生成
自动代码生成有4种方法
1、直接cmd下命令行生成
命令如下：java -jar 电脑上mybatis-generator-core-1.3.0.jar的绝对路径 -configfile 电脑上generator.xml的绝对路径，这里的generator.xml不一定要放在工程的src文件中。
如我的这个项目就是：
运行的结果如下：
然后在eclipse中刷新一下：结果出来了
看看各个文件
（1）User.java
package com.lin.domain;public class User { /** * This field was generated by MyBatis Generator. * This field corresponds to the database column t_user.USER_ID * * @mbggenerated */ private Integer userId; /** * This field was generated by MyBatis Generator. * This field corresponds to the database column t_user.USER_NAME * * @mbggenerated */ private String userName; /** * This field was generated by MyBatis Generator. * This field corresponds to the database column t_user.USER_PASSWORD * * @mbggenerated */ private String userPassword; /** * This field was generated by MyBatis Generator. * This field corresponds to the database column t_user.USER_EMAIL * * @mbggenerated */ private String userEmail; /** * This method was generated by MyBatis Generator. * This method returns the value of the database column t_user.USER_ID * * @return the value of t_user.USER_ID * * @mbggenerated */ public Integer getUserId() { return userId; } /** * This method was generated by MyBatis Generator. * This method sets the value of the database column t_user.USER_ID * * @param userId the value for t_user.USER_ID * * @mbggenerated */ public void setUserId(Integer userId) { this.userId = userId; } /** * This method was generated by MyBatis Generator. * This method returns the value of the database column t_user.USER_NAME * * @return the value of t_user.USER_NAME * * @mbggenerated */ public String getUserName() { return userName; } /** * This method was generated by MyBatis Generator. * This method sets the value of the database column t_user.USER_NAME * * @param userName the value for t_user.USER_NAME * * @mbggenerated */ public void setUserName(String userName) { this.userName = userName == null ? null : userName.trim(); } /** * This method was generated by MyBatis Generator. * This method returns the value of the database column t_user.USER_PASSWORD * * @return the value of t_user.USER_PASSWORD * * @mbggenerated */ public String getUserPassword() { return userPassword; } /** * This method was generated by MyBatis Generator. * This method sets the value of the database column t_user.USER_PASSWORD * * @param userPassword the value for t_user.USER_PASSWORD * * @mbggenerated */ public void setUserPassword(String userPassword) { this.userPassword = userPassword == null ? null : userPassword.trim(); } /** * This method was generated by MyBatis Generator. * This method returns the value of the database column t_user.USER_EMAIL * * @return the value of t_user.USER_EMAIL * * @mbggenerated */ public String getUserEmail() { return userEmail; } /** * This method was generated by MyBatis Generator. * This method sets the value of the database column t_user.USER_EMAIL * * @param userEmail the value for t_user.USER_EMAIL * * @mbggenerated */ public void setUserEmail(String userEmail) { this.userEmail = userEmail == null ? null : userEmail.trim(); }}
UserExample.java这个文件可以控制是否生成
package com.lin.domain;import java.util.ArrayList;import java.util.List;public class UserExample { /** * This field was generated by MyBatis Generator. * This field corresponds to the database table t_user * * @mbggenerated */ protected String orderByClause; /** * This field was generated by MyBatis Generator. * This field corresponds to the database table t_user * * @mbggenerated */ protected boolean distinct; /** * This field was generated by MyBatis Generator. * This field corresponds to the database table t_user * * @mbggenerated */ protected List<Criteria> oredCriteria; /** * This method was generated by MyBatis Generator. * This method corresponds to the database table t_user * * @mbggenerated */ public UserExample() { oredCriteria = new ArrayList<Criteria>(); } /** * This method was generated by MyBatis Generator. * This method corresponds to the database table t_user * * @mbggenerated */ public void setOrderByClause(String orderByClause) { this.orderByClause = orderByClause; } /** * This method was generated by MyBatis Generator. * This method corresponds to the database table t_user * * @mbggenerated */ public String getOrderByClause() { return orderByClause; } /** * This method was generated by MyBatis Generator. * This method corresponds to the database table t_user * * @mbggenerated */ public void setDistinct(boolean distinct) { this.distinct = distinct; } /** * This method was generated by MyBatis Generator. * This method corresponds to the database table t_user * * @mbggenerated */ public boolean isDistinct() { return distinct; } /** * This method was generated by MyBatis Generator. * This method corresponds to the database table t_user * * @mbggenerated */ public List<Criteria> getOredCriteria() { return oredCriteria; } /** * This method was generated by MyBatis Generator. * This method corresponds to the database table t_user * * @mbggenerated */ public void or(Criteria criteria) { oredCriteria.add(criteria); } /** * This method was generated by MyBatis Generator. * This method corresponds to the database table t_user * * @mbggenerated */ public Criteria or() { Criteria criteria = createCriteriaInternal(); oredCriteria.add(criteria); return criteria; } /** * This method was generated by MyBatis Generator. * This method corresponds to the database table t_user * * @mbggenerated */ public Criteria createCriteria() { Criteria criteria = createCriteriaInternal(); if (oredCriteria.size() == 0) { oredCriteria.add(criteria); } return criteria; } /** * This method was generated by MyBatis Generator. * This method corresponds to the database table t_user * * @mbggenerated */ protected Criteria createCriteriaInternal() { Criteria criteria = new Criteria(); return criteria; } /** * This method was generated by MyBatis Generator. * This method corresponds to the database table t_user * * @mbggenerated */ public void clear() { oredCriteria.clear(); orderByClause = null; distinct = false; } /** * This class was generated by MyBatis Generator. * This class corresponds to the database table t_user * * @mbggenerated */ protected abstract static class GeneratedCriteria { protected List<Criterion> criteria; protected GeneratedCriteria() { super(); criteria = new ArrayList<Criterion>(); } public boolean isValid() { return criteria.size() > 0; } public List<Criterion> getCriteria() { return criteria; } protected void addCriterion(String condition) { if (condition == null) { throw new RuntimeException("Value for condition cannot be null"); } criteria.add(new Criterion(condition)); } protected void addCriterion(String condition, Object value, String property) { if (value == null) { throw new RuntimeException("Value for " + property + " cannot be null"); } criteria.add(new Criterion(condition, value)); } protected void addCriterion(String condition, Object value1, Object value2, String property) { if (value1 == null || value2 == null) { throw new RuntimeException("Between values for " + property + " cannot be null"); } criteria.add(new Criterion(condition, value1, value2)); } public Criteria andUserIdIsNull() { addCriterion("USER_ID is null"); return (Criteria) this; } public Criteria andUserIdIsNotNull() { addCriterion("USER_ID is not null"); return (Criteria) this; } public Criteria andUserIdEqualTo(Integer value) { addCriterion("USER_ID =", value, "userId"); return (Criteria) this; } public Criteria andUserIdNotEqualTo(Integer value) { addCriterion("USER_ID <>", value, "userId"); return (Criteria) this; } public Criteria andUserIdGreaterThan(Integer value) { addCriterion("USER_ID >", value, "userId"); return (Criteria) this; } public Criteria andUserIdGreaterThanOrEqualTo(Integer value) { addCriterion("USER_ID >=", value, "userId"); return (Criteria) this; } public Criteria andUserIdLessThan(Integer value) { addCriterion("USER_ID <", value, "userId"); return (Criteria) this; } public Criteria andUserIdLessThanOrEqualTo(Integer value) { addCriterion("USER_ID <=", value, "userId"); return (Criteria) this; } public Criteria andUserIdIn(List<Integer> values) { addCriterion("USER_ID in", values, "userId"); return (Criteria) this; } public Criteria andUserIdNotIn(List<Integer> values) { addCriterion("USER_ID not in", values, "userId"); return (Criteria) this; } public Criteria andUserIdBetween(Integer value1, Integer value2) { addCriterion("USER_ID between", value1, value2, "userId"); return (Criteria) this; } public Criteria andUserIdNotBetween(Integer value1, Integer value2) { addCriterion("USER_ID not between", value1, value2, "userId"); return (Criteria) this; } public Criteria andUserNameIsNull() { addCriterion("USER_NAME is null"); return (Criteria) this; } public Criteria andUserNameIsNotNull() { addCriterion("USER_NAME is not null"); return (Criteria) this; } public Criteria andUserNameEqualTo(String value) { addCriterion("USER_NAME =", value, "userName"); return (Criteria) this; } public Criteria andUserNameNotEqualTo(String value) { addCriterion("USER_NAME <>", value, "userName"); return (Criteria) this; } public Criteria andUserNameGreaterThan(String value) { addCriterion("USER_NAME >", value, "userName"); return (Criteria) this; } public Criteria andUserNameGreaterThanOrEqualTo(String value) { addCriterion("USER_NAME >=", value, "userName"); return (Criteria) this; } public Criteria andUserNameLessThan(String value) { addCriterion("USER_NAME <", value, "userName"); return (Criteria) this; } public Criteria andUserNameLessThanOrEqualTo(String value) { addCriterion("USER_NAME <=", value, "userName"); return (Criteria) this; } public Criteria andUserNameLike(String value) { addCriterion("USER_NAME like", value, "userName"); return (Criteria) this; } public Criteria andUserNameNotLike(String value) { addCriterion("USER_NAME not like", value, "userName"); return (Criteria) this; } public Criteria andUserNameIn(List<String> values) { addCriterion("USER_NAME in", values, "userName"); return (Criteria) this; } public Criteria andUserNameNotIn(List<String> values) { addCriterion("USER_NAME not in", values, "userName"); return (Criteria) this; } public Criteria andUserNameBetween(String value1, String value2) { addCriterion("USER_NAME between", value1, value2, "userName"); return (Criteria) this; } public Criteria andUserNameNotBetween(String value1, String value2) { addCriterion("USER_NAME not between", value1, value2, "userName"); return (Criteria) this; } public Criteria andUserPasswordIsNull() { addCriterion("USER_PASSWORD is null"); return (Criteria) this; } public Criteria andUserPasswordIsNotNull() { addCriterion("USER_PASSWORD is not null"); return (Criteria) this; } public Criteria andUserPasswordEqualTo(String value) { addCriterion("USER_PASSWORD =", value, "userPassword"); return (Criteria) this; } public Criteria andUserPasswordNotEqualTo(String value) { addCriterion("USER_PASSWORD <>", value, "userPassword"); return (Criteria) this; } public Criteria andUserPasswordGreaterThan(String value) { addCriterion("USER_PASSWORD >", value, "userPassword"); return (Criteria) this; } public Criteria andUserPasswordGreaterThanOrEqualTo(String value) { addCriterion("USER_PASSWORD >=", value, "userPassword"); return (Criteria) this; } public Criteria andUserPasswordLessThan(String value) { addCriterion("USER_PASSWORD <", value, "userPassword"); return (Criteria) this; } public Criteria andUserPasswordLessThanOrEqualTo(String value) { addCriterion("USER_PASSWORD <=", value, "userPassword"); return (Criteria) this; } public Criteria andUserPasswordLike(String value) { addCriterion("USER_PASSWORD like", value, "userPassword"); return (Criteria) this; } public Criteria andUserPasswordNotLike(String value) { addCriterion("USER_PASSWORD not like", value, "userPassword"); return (Criteria) this; } public Criteria andUserPasswordIn(List<String> values) { addCriterion("USER_PASSWORD in", values, "userPassword"); return (Criteria) this; } public Criteria andUserPasswordNotIn(List<String> values) { addCriterion("USER_PASSWORD not in", values, "userPassword"); return (Criteria) this; } public Criteria andUserPasswordBetween(String value1, String value2) { addCriterion("USER_PASSWORD between", value1, value2, "userPassword"); return (Criteria) this; } public Criteria andUserPasswordNotBetween(String value1, String value2) { addCriterion("USER_PASSWORD not between", value1, value2, "userPassword"); return (Criteria) this; } public Criteria andUserEmailIsNull() { addCriterion("USER_EMAIL is null"); return (Criteria) this; } public Criteria andUserEmailIsNotNull() { addCriterion("USER_EMAIL is not null"); return (Criteria) this; } public Criteria andUserEmailEqualTo(String value) { addCriterion("USER_EMAIL =", value, "userEmail"); return (Criteria) this; } public Criteria andUserEmailNotEqualTo(String value) { addCriterion("USER_EMAIL <>", value, "userEmail"); return (Criteria) this; } public Criteria andUserEmailGreaterThan(String value) { addCriterion("USER_EMAIL >", value, "userEmail"); return (Criteria) this; } public Criteria andUserEmailGreaterThanOrEqualTo(String value) { addCriterion("USER_EMAIL >=", value, "userEmail"); return (Criteria) this; } public Criteria andUserEmailLessThan(String value) { addCriterion("USER_EMAIL <", value, "userEmail"); return (Criteria) this; } public Criteria andUserEmailLessThanOrEqualTo(String value) { addCriterion("USER_EMAIL <=", value, "userEmail"); return (Criteria) this; } public Criteria andUserEmailLike(String value) { addCriterion("USER_EMAIL like", value, "userEmail"); return (Criteria) this; } public Criteria andUserEmailNotLike(String value) { addCriterion("USER_EMAIL not like", value, "userEmail"); return (Criteria) this; } public Criteria andUserEmailIn(List<String> values) { addCriterion("USER_EMAIL in", values, "userEmail"); return (Criteria) this; } public Criteria andUserEmailNotIn(List<String> values) { addCriterion("USER_EMAIL not in", values, "userEmail"); return (Criteria) this; } public Criteria andUserEmailBetween(String value1, String value2) { addCriterion("USER_EMAIL between", value1, value2, "userEmail"); return (Criteria) this; } public Criteria andUserEmailNotBetween(String value1, String value2) { addCriterion("USER_EMAIL not between", value1, value2, "userEmail"); return (Criteria) this; } } /** * This class was generated by MyBatis Generator. * This class corresponds to the database table t_user * * @mbggenerated do_not_delete_during_merge */ public static class Criteria extends GeneratedCriteria { protected Criteria() { super(); } } /** * This class was generated by MyBatis Generator. * This class corresponds to the database table t_user * * @mbggenerated */ public static class Criterion { private String condition; private Object value; private Object secondValue; private boolean noValue; private boolean singleValue; private boolean betweenValue; private boolean listValue; public String getCondition() { return condition; } public Object getValue() { return value; } public Object getSecondValue() { return secondValue; } public boolean isNoValue() { return noValue; } public boolean isSingleValue() { return singleValue; } public boolean isBetweenValue() { return betweenValue; } public boolean isListValue() { return listValue; } protected Criterion(String condition) { super(); this.condition = condition; this.noValue = true; } protected Criterion(String condition, Object value) { super(); this.condition = condition; this.value = value; if (value instanceof List<?>) { this.listValue = true; } else { this.singleValue = true; } } protected Criterion(String condition, Object value, Object secondValue) { super(); this.condition = condition; this.value = value; this.secondValue = secondValue; this.betweenValue = true; } }}
（2）dao层文件。它自动取名为UserMapper.java，可以自己手动写成UserDao.java
package com.lin.dao;import com.lin.domain.User;import com.lin.domain.UserExample;import java.util.List;import org.apache.ibatis.annotations.Param;public interface UserMapper { /** * This method was generated by MyBatis Generator. * This method corresponds to the database table t_user * * @mbggenerated */ int countByExample(UserExample example); /** * This method was generated by MyBatis Generator. * This method corresponds to the database table t_user * * @mbggenerated */ int deleteByExample(UserExample example); /** * This method was generated by MyBatis Generator. * This method corresponds to the database table t_user * * @mbggenerated */ int deleteByPrimaryKey(Integer userId); /** * This method was generated by MyBatis Generator. * This method corresponds to the database table t_user * * @mbggenerated */ int insert(User record); /** * This method was generated by MyBatis Generator. * This method corresponds to the database table t_user * * @mbggenerated */ int insertSelective(User record); /** * This method was generated by MyBatis Generator. * This method corresponds to the database table t_user * * @mbggenerated */ List<User> selectByExample(UserExample example); /** * This method was generated by MyBatis Generator. * This method corresponds to the database table t_user * * @mbggenerated */ User selectByPrimaryKey(Integer userId); /** * This method was generated by MyBatis Generator. * This method corresponds to the database table t_user * * @mbggenerated */ int updateByExampleSelective(@Param("record") User record, @Param("example") UserExample example); /** * This method was generated by MyBatis Generator. * This method corresponds to the database table t_user * * @mbggenerated */ int updateByExample(@Param("record") User record, @Param("example") UserExample example); /** * This method was generated by MyBatis Generator. * This method corresponds to the database table t_user * * @mbggenerated */ int updateByPrimaryKeySelective(User record); /** * This method was generated by MyBatis Generator. * This method corresponds to the database table t_user * * @mbggenerated */ int updateByPrimaryKey(User record);}
(3)Mapper.xml文件：
<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" ><mapper namespace="com.lin.dao.UserMapper" > <resultMap id="BaseResultMap" type="com.lin.domain.User" > <!-- WARNING - @mbggenerated This element is automatically generated by MyBatis Generator, do not modify. --> <id column="USER_ID" property="userId" jdbcType="INTEGER" /> <result column="USER_NAME" property="userName" jdbcType="CHAR" /> <result column="USER_PASSWORD" property="userPassword" jdbcType="CHAR" /> <result column="USER_EMAIL" property="userEmail" jdbcType="CHAR" /> </resultMap> <sql id="Example_Where_Clause" > <!-- WARNING - @mbggenerated This element is automatically generated by MyBatis Generator, do not modify. --> <where > <foreach collection="oredCriteria" item="criteria" separator="or" > <if test="criteria.valid" > <trim prefix="(" suffix=")" prefixOverrides="and" > <foreach collection="criteria.criteria" item="criterion" > <choose > <when test="criterion.noValue" > and ${criterion.condition} </when> <when test="criterion.singleValue" > and ${criterion.condition} #{criterion.value} </when> <when test="criterion.betweenValue" > and ${criterion.condition} #{criterion.value} and #{criterion.secondValue} </when> <when test="criterion.listValue" > and ${criterion.condition} <foreach collection="criterion.value" item="listItem" open="(" close=")" separator="," > #{listItem} </foreach> </when> </choose> </foreach> </trim> </if> </foreach> </where> </sql> <sql id="Update_By_Example_Where_Clause" > <!-- WARNING - @mbggenerated This element is automatically generated by MyBatis Generator, do not modify. --> <where > <foreach collection="example.oredCriteria" item="criteria" separator="or" > <if test="criteria.valid" > <trim prefix="(" suffix=")" prefixOverrides="and" > <foreach collection="criteria.criteria" item="criterion" > <choose > <when test="criterion.noValue" > and ${criterion.condition} </when> <when test="criterion.singleValue" > and ${criterion.condition} #{criterion.value} </when> <when test="criterion.betweenValue" > and ${criterion.condition} #{criterion.value} and #{criterion.secondValue} </when> <when test="criterion.listValue" > and ${criterion.condition} <foreach collection="criterion.value" item="listItem" open="(" close=")" separator="," > #{listItem} </foreach> </when> </choose> </foreach> </trim> </if> </foreach> </where> </sql> <sql id="Base_Column_List" > <!-- WARNING - @mbggenerated This element is automatically generated by MyBatis Generator, do not modify. --> USER_ID, USER_NAME, USER_PASSWORD, USER_EMAIL </sql> <select id="selectByExample" resultMap="BaseResultMap" parameterType="com.lin.domain.UserExample" > <!-- WARNING - @mbggenerated This element is automatically generated by MyBatis Generator, do not modify. --> select <if test="distinct" > distinct </if> <include refid="Base_Column_List" /> from t_user <if test="_parameter != null" > <include refid="Example_Where_Clause" /> </if> <if test="orderByClause != null" > order by ${orderByClause} </if> </select> <select id="selectByPrimaryKey" resultMap="BaseResultMap" parameterType="java.lang.Integer" > <!-- WARNING - @mbggenerated This element is automatically generated by MyBatis Generator, do not modify. --> select <include refid="Base_Column_List" /> from t_user where USER_ID = #{userId,jdbcType=INTEGER} </select> <delete id="deleteByPrimaryKey" parameterType="java.lang.Integer" > <!-- WARNING - @mbggenerated This element is automatically generated by MyBatis Generator, do not modify. --> delete from t_user where USER_ID = #{userId,jdbcType=INTEGER} </delete> <delete id="deleteByExample" parameterType="com.lin.domain.UserExample" > <!-- WARNING - @mbggenerated This element is automatically generated by MyBatis Generator, do not modify. --> delete from t_user <if test="_parameter != null" > <include refid="Example_Where_Clause" /> </if> </delete> <insert id="insert" parameterType="com.lin.domain.User" > <!-- WARNING - @mbggenerated This element is automatically generated by MyBatis Generator, do not modify. --> insert into t_user (USER_ID, USER_NAME, USER_PASSWORD, USER_EMAIL) values (#{userId,jdbcType=INTEGER}, #{userName,jdbcType=CHAR}, #{userPassword,jdbcType=CHAR}, #{userEmail,jdbcType=CHAR}) </insert> <insert id="insertSelective" parameterType="com.lin.domain.User" > <!-- WARNING - @mbggenerated This element is automatically generated by MyBatis Generator, do not modify. --> insert into t_user <trim prefix="(" suffix=")" suffixOverrides="," > <if test="userId != null" > USER_ID, </if> <if test="userName != null" > USER_NAME, </if> <if test="userPassword != null" > USER_PASSWORD, </if> <if test="userEmail != null" > USER_EMAIL, </if> </trim> <trim prefix="values (" suffix=")" suffixOverrides="," > <if test="userId != null" > #{userId,jdbcType=INTEGER}, </if> <if test="userName != null" > #{userName,jdbcType=CHAR}, </if> <if test="userPassword != null" > #{userPassword,jdbcType=CHAR}, </if> <if test="userEmail != null" > #{userEmail,jdbcType=CHAR}, </if> </trim> </insert> <select id="countByExample" parameterType="com.lin.domain.UserExample" resultType="java.lang.Integer" > <!-- WARNING - @mbggenerated This element is automatically generated by MyBatis Generator, do not modify. --> select count(*) from t_user <if test="_parameter != null" > <include refid="Example_Where_Clause" /> </if> </select> <update id="updateByExampleSelective" parameterType="map" > <!-- WARNING - @mbggenerated This element is automatically generated by MyBatis Generator, do not modify. --> update t_user <set > <if test="record.userId != null" > USER_ID = #{record.userId,jdbcType=INTEGER}, </if> <if test="record.userName != null" > USER_NAME = #{record.userName,jdbcType=CHAR}, </if> <if test="record.userPassword != null" > USER_PASSWORD = #{record.userPassword,jdbcType=CHAR}, </if> <if test="record.userEmail != null" > USER_EMAIL = #{record.userEmail,jdbcType=CHAR}, </if> </set> <if test="_parameter != null" > <include refid="Update_By_Example_Where_Clause" /> </if> </update> <update id="updateByExample" parameterType="map" > <!-- WARNING - @mbggenerated This element is automatically generated by MyBatis Generator, do not modify. --> update t_user set USER_ID = #{record.userId,jdbcType=INTEGER}, USER_NAME = #{record.userName,jdbcType=CHAR}, USER_PASSWORD = #{record.userPassword,jdbcType=CHAR}, USER_EMAIL = #{record.userEmail,jdbcType=CHAR} <if test="_parameter != null" > <include refid="Update_By_Example_Where_Clause" /> </if> </update> <update id="updateByPrimaryKeySelective" parameterType="com.lin.domain.User" > <!-- WARNING - @mbggenerated This element is automatically generated by MyBatis Generator, do not modify. --> update t_user <set > <if test="userName != null" > USER_NAME = #{userName,jdbcType=CHAR}, </if> <if test="userPassword != null" > USER_PASSWORD = #{userPassword,jdbcType=CHAR}, </if> <if test="userEmail != null" > USER_EMAIL = #{userEmail,jdbcType=CHAR}, </if> </set> where USER_ID = #{userId,jdbcType=INTEGER} </update> <update id="updateByPrimaryKey" parameterType="com.lin.domain.User" > <!-- WARNING - @mbggenerated This element is automatically generated by MyBatis Generator, do not modify. --> update t_user set USER_NAME = #{userName,jdbcType=CHAR}, USER_PASSWORD = #{userPassword,jdbcType=CHAR}, USER_EMAIL = #{userEmail,jdbcType=CHAR} where USER_ID = #{userId,jdbcType=INTEGER} </update></mapper>
这样就好了，serivce层的文件自己再去写写就好了。
如果不想要UserExample文件怎么办呢？
那就把
<table schema="general" tableName="T_USER" domainObjectName="User"> <!--domain字段的命名规则，false:默认为驼峰命名 true:按数据库真实命名 --> <property name="useActualColumnNames" value="false"/> </table>换成：
<table schema="general" tableName="T_USER" domainObjectName="User" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false"> <!--domain字段的命名规则，false:默认为驼峰命名 true:按数据库真实命名 --> <property name="useActualColumnNames" value="false"/> </table>这样就可以了
2、java代码读取xml文件生成
首先要导入如下的包：
然后在工程里写一个文件如下：
package Test;import java.io.File;import java.io.IOException;import java.sql.SQLException;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.InvalidConfigurationException;import org.mybatis.generator.exception.XMLParserException;import org.mybatis.generator.internal.DefaultShellCallback;public class BuildFile { public static void main(String[] args) throws InvalidConfigurationException, IOException, XMLParserException, SQLException, InterruptedException { List<String> warnings = new ArrayList<String>(); boolean overwrite = true; File configFile = new File("D:\\lunaJee-workspace\\MyBatisLearningChapter7\\src\\generator.xml"); //输入绝对路径 ConfigurationParser cp = new ConfigurationParser(warnings); Configuration config=null; config = cp.parseConfiguration(configFile); DefaultShellCallback callback = new DefaultShellCallback(overwrite); MyBatisGenerator myBatisGenerator = null; myBatisGenerator = new MyBatisGenerator(config, callback, warnings); myBatisGenerator.generate(null); }}
然后运行，再刷新下就可以了
这里说一下，generator.xml文件也是可以随便放的，我这里为了方便，把它和整个工程放在一起了
3、eclipse插入mybatis generator生成
待续~~
4、maven生成
待续~~