Mybatis本身主動生成代碼

         林炳文Evankaka原創做品。

轉載請註明出處http://blog.csdn.net/evankaka

       摘要：本文將簡要介紹如何利用Mybatis Generator本身主動生成Mybatis的相關代碼，Mybatis Generator是一個很好用的工具，使用它可以大大節省開發的時間，並下降代碼的編寫量。

本文project免費下載

1、構建一個環境

1. 首先建立一個表：

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 主頁 http://code.google.com/p/mybatis/ 上下載 Mybatis mybatis-generator-core 或者在這裏下載：http://download.csdn.net/detail/evankaka/8926999

2、xml文件編寫

一、新建一個project。而後新建例如如下包。都是空的

二、而後新建generator.xmll文件

內容例如如下：

<?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:數據庫的JDBC驅動的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" />
		<!-- 是否去除本身主動生成的凝視 true：是 ： false:否 -->
		<property name="suppressAllComments" value="false" />
		<!-- 是否生成凝視代時間戳-->  
		<property name="suppressDate" value="true" /> 
		</commentGenerator>

		<!--數據庫鏈接的信息：驅動類、鏈接地址、username、密碼 -->
		<jdbcConnection driverClass="com.mysql.jdbc.Driver"
			connectionURL="jdbc:mysql://localhost/learning" userId="root"
			password="christmas258@">
		</jdbcConnection>
		<!-- 默認false，把JDBC DECIMAL 和 NUMERIC 類型解析爲 Integer true。把JDBC DECIMAL 和 
			NUMERIC 類型解析爲java.math.BigDecimal -->
	<!-- 	<javaTypeResolver>
			<property name="forceBigDecimals" value="false" />
		</javaTypeResolver> -->
        <!--生成Model類存放位置 -->
		<javaModelGenerator targetPackage="com.lin.domain"
			targetProject="D:\lunaJee-workspace\MyBatisLearningChapter7\src">
			 <!-- 是否在當前路徑下新加一層schema,eg：fase路徑com.oop.eksp.user.model。 true:com.oop.eksp.user.model.[schemaName] -->  
			<property name="enableSubPackages" value="false" />
			 <!-- 是否針對string類型的字段在set的時候進行trim調用 -->  
			<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類存放位置 -->
		<javaClientGenerator type="XMLMAPPER"
			targetPackage="com.lin.dao" targetProject="D:\lunaJee-workspace\MyBatisLearningChapter7\src">
			<property name="enableSubPackages" value="true" />
		</javaClientGenerator>
		

       	<!-- tableName:用於本身主動生成代碼的數據庫表；domainObjectName:相應於數據庫表的javaBean類名 -->  
        <table schema="general" tableName="T_USER" domainObjectName="User">
         <!--domain字段的命名規則。false:默以爲駝峯命名 true:按數據庫真實命名  -->
        <property name="useActualColumnNames" value="false"/>
        <!-- 忽略列，不生成bean 字段 -->  
        <!--     <ignoreColumn column="FRED" />   -->
        <!-- 指定列的java數據類型 -->  
        <!--     <columnOverride column="LONG_VARCHAR_FIELD" jdbcType="VARCHAR" />   -->
        </table>
	</context>
</generatorConfiguration>

3、本身主動代碼生成

本身主動代碼生成有4種方法

一、直接cmd下命令行生成

命令例如如下：java -jar 電腦上mybatis-generator-core-1.3.0.jar的絕對路徑  -configfile 電腦上generator.xml的絕對路徑，這裏的generator.xml不必定要放在project的src文件裏。

如個人這個項目就是：

執行的結果例如如下：

而後在eclipse中刷新一下：結果出來了

看看各個文件

（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這個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層文件。

它本身主動取名爲UserMapper.java，可以本身手動寫成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>

這樣就行了，serivce層的文件本身再去寫寫就行了。

假設不想要UserExample文件怎麼辦呢？

那就把

        <table schema="general" tableName="T_USER" domainObjectName="User">
         <!--domain字段的命名規則。false:默以爲駝峯命名 true:按數據庫真實命名  -->
        <property name="useActualColumnNames" value="false"/>
        </table>

換成：

        <table schema="general" tableName="T_USER" domainObjectName="User" enableCountByExample="false" enableUpdateByExample="false"
               enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false">
         <!--domain字段的命名規則，false:默以爲駝峯命名 true:按數據庫真實命名  -->
        <property name="useActualColumnNames" value="false"/>
        </table>

這樣就可以了
二、java代碼讀取xml文件生成

首先要導入例如如下的包：

而後在project裏寫一個文件例如如下：

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");  //輸入絕對路徑
	      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);
	}
}

而後執行。再刷新下就可以了

這裏說一下。generator.xml文件也是可以隨便放的，我這裏爲了方便。把它和整個project放在一塊兒了

本文project免費下載

三、eclipse插入mybatis generator生成

待續~~

四、maven生成

待續~~