0.在Intellij IDEA创建maven项目
1. 在maven项目的pom.xml 添加mybatis-generator-maven-plugin 插件
<build>
<finalName>xxx</finalName>
<plugins>
<plugin>
<groupId>org.mybatis.generator</groupId>
<artifactId>mybatis-generator-maven-plugin</artifactId>
<version>1.3.2</version>
<configuration>
<verbose>true</verbose>
<overwrite>true</overwrite>
</configuration>
</plugin>
</plugins>
</build>
2. 在maven项目下的src/main/resources 目录下建立名为 generatorConfig.xml的配置文件,作为mybatis-generator-maven-plugin 插件的执行目标,模板如下:
<?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>
<!--导入属性配置 -->
<properties resource="generator.properties"></properties> <!--指定特定数据库的jdbc驱动jar包的位置 -->
<classPathEntry location="${jdbc.driverLocation}"/> <context id="default" targetRuntime="MyBatis3"> <!-- optional,旨在创建class时,对注释进行控制 -->
<commentGenerator>
<property name="suppressDate" value="true" />
</commentGenerator> <!--jdbc的数据库连接 -->
<jdbcConnection driverClass="${jdbc.driverClass}" connectionURL="${jdbc.connectionURL}" userId="${jdbc.userId}" password="${jdbc.password}">
</jdbcConnection> <!-- 非必需,类型处理器,在数据库类型和java类型之间的转换控制-->
<javaTypeResolver >
<property name="forceBigDecimals" value="false" />
</javaTypeResolver> <!-- Model模型生成器,用来生成含有主键key的类,记录类 以及查询Example类
targetPackage 指定生成的model生成所在的包名
targetProject 指定在该项目下所在的路径
-->
<javaModelGenerator targetPackage="org.louis.hometutor.po" targetProject="src/main/java">
<!-- 是否对model添加 构造函数 -->
<property name="constructorBased" value="true"/> <!-- 是否允许子包,即targetPackage.schemaName.tableName -->
<property name="enableSubPackages" value="false"/> <!-- 建立的Model对象是否 不可改变 即生成的Model对象不会有 setter方法,只有构造方法 -->
<property name="immutable" value="true"/> <!-- 给Model添加一个父类 -->
<property name="rootClass" value="com.foo.louis.Hello"/> <!-- 是否对类CHAR类型的列的数据进行trim操作 -->
<property name="trimStrings" value="true"/>
</javaModelGenerator> <!--Mapper映射文件生成所在的目录 为每一个数据库的表生成对应的SqlMap文件 -->
<sqlMapGenerator targetPackage="org.louis.hometutor.domain" targetProject="src/main/java">
<property name="enableSubPackages" value="false"/>
</sqlMapGenerator> <!-- 客户端代码,生成易于使用的针对Model对象和XML配置文件 的代码
type="ANNOTATEDMAPPER",生成Java Model 和基于注解的Mapper对象
type="MIXEDMAPPER",生成基于注解的Java Model 和相应的Mapper对象
type="XMLMAPPER",生成SQLMap XML文件和独立的Mapper接口
-->
<javaClientGenerator targetPackage="com.foo.tourist.dao" targetProject="src/main/java" type="MIXEDMAPPER">
<property name="enableSubPackages" value=""/>
<!--
定义Maper.java 源代码中的ByExample() 方法的可视性,可选的值有:
public;
private;
protected;
default
注意:如果 targetRuntime="MyBatis3",此参数被忽略
-->
<property name="exampleMethodVisibility" value=""/>
<!--
方法名计数器
Important note: this property is ignored if the target runtime is MyBatis3.
-->
<property name="methodNameCalculator" value=""/> <!--
为生成的接口添加父接口
-->
<property name="rootInterface" value=""/> </javaClientGenerator> <table tableName="lession" schema="louis"> <!-- optional , only for mybatis3 runtime
自动生成的键值(identity,或者序列值)
如果指定此元素,MBG将会生成<selectKey>元素,然后将此元素插入到SQL Map的<insert> 元素之中
sqlStatement 的语句将会返回新的值
如果是一个自增主键的话,你可以使用预定义的语句,或者添加自定义的SQL语句. 预定义的值如下:
Cloudscape This will translate to: VALUES IDENTITY_VAL_LOCAL()
DB2: VALUES IDENTITY_VAL_LOCAL()
DB2_MF: SELECT IDENTITY_VAL_LOCAL() FROM SYSIBM.SYSDUMMY1
Derby: VALUES IDENTITY_VAL_LOCAL()
HSQLDB: CALL IDENTITY()
Informix: select dbinfo('sqlca.sqlerrd1') from systables where tabid=1
MySql: SELECT LAST_INSERT_ID()
SqlServer: SELECT SCOPE_IDENTITY()
SYBASE: SELECT @@IDENTITY
JDBC: This will configure MBG to generate code for MyBatis3 suport of JDBC standard generated keys.
This is a database independent method of obtaining the value from identity columns.
identity: 自增主键 If true, then the column is flagged as an identity column and the generated <selectKey>
element will be placed after the insert (for an identity column). If false, then the generated <selectKey> will be placed before
the insert (typically for a sequence). -->
<generatedKey column="" sqlStatement="" identity="" type=""/> <!-- optional.
列的命名规则:
MBG使用 <columnRenamingRule> 元素在计算列名的对应 名称之前,先对列名进行重命名,
作用:一般需要对BUSI_CLIENT_NO 前的BUSI_进行过滤
支持正在表达式
searchString 表示要被换掉的字符串
replaceString 则是要换成的字符串,默认情况下为空字符串,可选
-->
<columnRenamingRule searchString="" replaceString=""/> <!-- optional.告诉 MBG 忽略某一列
column,需要忽略的列
delimitedColumnName:true ,匹配column的值和数据库列的名称 大小写完全匹配,false 忽略大小写匹配
是否限定表的列名,即固定表列在Model中的名称
-->
<ignoreColumn column="PLAN_ID" delimitedColumnName="true" /> <!--optional.覆盖MBG对Model 的生成规则
column: 数据库的列名
javaType: 对应的Java数据类型的完全限定名
在必要的时候可以覆盖由JavaTypeResolver计算得到的java数据类型. For some databases, this is necessary to handle "odd"
database types (e.g. MySql's unsigned bigint type should be mapped to java.lang.Object).
jdbcType:该列的JDBC数据类型(INTEGER, DECIMAL, NUMERIC, VARCHAR, etc.),该列可以覆盖由JavaTypeResolver计算得到的Jdbc类型,
对某些数据库而言,对于处理特定的JDBC 驱动癖好 很有必要(e.g. DB2's LONGVARCHAR type should be mapped to VARCHAR for iBATIS).
typeHandler: -->
<columnOverride column="" javaType="" jdbcType="" typeHandler="" delimitedColumnName="" /> </table>
</context>
</generatorConfiguration>
这里使用了外置的配置文件generator.properties,可以将一下属性配置到properties文件之中,增加配置的灵活性:
jdbc.driverLocation=D:\\maven\\com\\oracle\\ojdbc14\\10.2.0.4.0\\ojdbc14-10.2.0.4.0.jar
jdbc.driverClass=oracle.jdbc.driver.OracleDriver
jdbc.connectionURL=jdbc:oracle:thin:@//localhost:1521/XE
jdbc.userId=LOUIS
jdbc.password=123456
项目目录如下:
3. 在Intellij IDEA添加一个“Run运行”选项,使用maven运行mybatis-generator-maven-plugin插件 :
之后弹出运行配置框,为当前配置配置一个名称,这里其名为"generator",然后在 “Command line” 选项中输入“mybatis-generator:generate -e”
这里加了“-e ”选项是为了让该插件输出详细信息,这样可以帮助我们定位问题
如果添加成功,则会在run 选项中有“generator” 选项,如下:
点击运行,然后不出意外的话,会在控制台输出:
C:\Java\jdk1.7.0_71\bin\java -Dmaven.home=D:\software\apache-maven-3.0.5-bin -Dclassworlds.conf=D:\software\apache-maven-3.0.5-bin\bin\m2.conf -Didea.launcher.port=7533 "-Didea.launcher.bin.path=D:\applications\JetBrains\IntelliJ IDEA 14.0.2\bin" -Dfile.encoding=UTF-8 -classpath "D:\software\apache-maven-3.0.5-bin\boot\plexus-classworlds-2.4.jar;D:\applications\JetBrains\IntelliJ IDEA 14.0.2\lib\idea_rt.jar" com.intellij.rt.execution.application.AppMain org.codehaus.classworlds.Launcher -Didea.version=14.0.2 -s D:\software\apache-maven-3.0.5-bin\conf\settings.xml mybatis-generator:generate -e
[INFO] Error stacktraces are turned on.
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building hometutor Maven Webapp 1.0-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] --- mybatis-generator-maven-plugin:1.3.2:generate (default-cli) @ hometutor ---
[INFO] Connecting to the Database
[INFO] Introspecting table louis.lession
log4j:WARN No appenders could be found for logger (org.mybatis.generator.internal.db.DatabaseIntrospector).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
[INFO] Generating Example class for table LOUIS.LESSION
[INFO] Generating Record class for table LOUIS.LESSION
[INFO] Generating Mapper Interface for table LOUIS.LESSION
[INFO] Generating SQL Map for table LOUIS.LESSION
[INFO] Saving file LessionMapper.xml
[INFO] Saving file LessionExample.java
[INFO] Saving file Lession.java
[INFO] Saving file LessionMapper.java
[WARNING] Root class com.foo.louis.Hello cannot be loaded, checking for member overrides is disabled for this class
[WARNING] Existing file E:\sources\tutor\src\main\java\org\louis\hometutor\po\Lession.java was overwritten
[WARNING] Existing file E:\sources\tutor\src\main\java\com\foo\tourist\dao\LessionMapper.java was overwritten
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 2.334s
[INFO] Finished at: Tue Jan 27 12:04:08 CST 2015
[INFO] Final Memory: 8M/107M
[INFO] ------------------------------------------------------------------------ Process finished with exit code 0
看到BUILD SUCCESS,则大功告成,如果有错误的话,由于添加了-e 选项,会把具体的详细错误信息打印出来的,根据错误信息修改即可