MyBatis学习总结_09_使用MyBatis Generator自动创建代码

Posted 2020-08-13

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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

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2、然后新建generator.xmll文件

内容如下：

[html] view plain copy

<?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 location="D:\Java\Jar\mysql-connector-java-5.1.22\mysql-connector-java-5.1.22-bin.jar" />
<context id="DB2Tables" targetRuntime="MyBatis3">
<commentGenerator>
<property name="suppressTypeWarnings" value="true" />
<property name="suppressAllComments" value="false" />
<property name="suppressDate" value="true" />
</commentGenerator>
<jdbcConnection driverClass="com.mysql.jdbc.Driver"
connectionURL="jdbc:mysql://localhost/learning" userId="root"
password="[email protected]">
</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> -->
<javaModelGenerator targetPackage="com.lin.domain"
targetProject="D:\lunaJee-workspace\MyBatisLearningChapter7\src">
<property name="enableSubPackages" value="false" />
<property name="trimStrings" value="true" />
</javaModelGenerator>
<sqlMapGenerator targetPackage="com.lin.mapper"
targetProject="D:\lunaJee-workspace\MyBatisLearningChapter7\src">
<property name="enableSubPackages" value="true" />
</sqlMapGenerator>
<javaClientGenerator type="XMLMAPPER"
targetPackage="com.lin.dao" targetProject="D:\lunaJee-workspace\MyBatisLearningChapter7\src">
<property name="enableSubPackages" value="true" />
</javaClientGenerator>
<table schema="general" tableName="T_USER" domainObjectName="User">
<property name="useActualColumnNames" value="false"/>
</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：

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运行的结果如下：

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然后在eclipse中刷新一下：结果出来了

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看看各个文件

（1）User.java

[java] view plain copy

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

[java] view plain copy

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

[java] view plain copy

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：

[html] view plain copy

<?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

[html] view plain copy

<table schema="general" tableName="T_USER" domainObjectName="User">
<property name="useActualColumnNames" value="false"/>
</table>

换成：

[html] view plain copy

<table schema="general" tableName="T_USER" domainObjectName="User" enableCountByExample="false" enableUpdateByExample="false"
enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false">
<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：

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然后在工程里写一个文件如下：

[java] view plain copy

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

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