對於mybatis generator 參考了一些文章,填了一些坑,最後經過通實踐,做了一個示例;
環境:
數據庫:mysql5.6;
JDK: 1.8;
mybatis-generator-core-1.3.2.jar
做好如下準備:
1:下載 mybatis-generator-core-1.3.2.jar ;版本自定.
2:準備 mysql數據庫驅動;
3:編寫 mybatisGenerator.xml 文件; 名字可以自定義
具體步驟:
1:編寫 mybatisGenerator.xml ,具體內容可參考下面文檔
<?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>
<context id="testTables" targetRuntime="MyBatis3">
<commentGenerator>
<!-- 是否去除自動生成的註釋 true:是 : false:否 -->
<property name="suppressAllComments" value="true" />
</commentGenerator>
<!--數據庫連接的信息:驅動類、連接地址、用戶名、密碼 -->
<jdbcConnection driverClass="com.mysql.jdbc.Driver"
connectionURL="jdbc:mysql://localhost:3306/yizhuo" userId="root"
password="">
</jdbcConnection>
<!-- 默認false,把JDBC DECIMAL 和 NUMERIC 類型解析爲 Integer,爲 true時把JDBC DECIMAL 和
NUMERIC 類型解析爲java.math.BigDecimal -->
<javaTypeResolver>
<property name="forceBigDecimals" value="true" />
</javaTypeResolver>
<!-- targetProject:生成PO類的位置 -->
<javaModelGenerator targetPackage="com.test.mbg.po"
targetProject=".\src">
<!-- enableSubPackages:是否讓schema作爲包的後綴 -->
<property name="enableSubPackages" value="false" />
<!-- 從數據庫返回的值被清理前後的空格 -->
<property name="trimStrings" value="true" />
</javaModelGenerator>
<!-- targetProject:mapper映射文件生成的位置 -->
<sqlMapGenerator targetPackage="com.test.mbg.mapper"
targetProject=".\src">
<!-- enableSubPackages:是否讓schema作爲包的後綴 -->
<property name="enableSubPackages" value="false" />
</sqlMapGenerator>
<!-- targetPackage:mapper接口生成的位置 -->
<javaClientGenerator type="XMLMAPPER"
targetPackage="com.test.mbg.mapper"
targetProject=".\src">
<!-- enableSubPackages:是否讓schema作爲包的後綴 -->
<property name="enableSubPackages" value="false" />
</javaClientGenerator>
<!-- 指定數據庫表 -->
<table tableName="demand"></table>
<table tableName="demand_technical"></table>
<table tableName="technical"></table>
<table tableName="log_info"></table>
<table tableName="user"></table>
<!-- 有些表的字段需要指定java類型
<table schema="DB2ADMIN" tableName="ALLTYPES" domainObjectName="Customer" >
<property name="useActualColumnNames" value="true"/>
<generatedKey column="ID" sqlStatement="DB2" identity="true" />
<columnOverride column="DATE_FIELD" property="startDate" />
<ignoreColumn column="FRED" />
<columnOverride column="LONG_VARCHAR_FIELD" jdbcType="VARCHAR" />
</table> -->
</context>
</generatorConfiguration>
2:創建一個簡單的Java工程,並創建一個類,類的具體業務內容如下:
import org.mybatis.generator.api.MyBatisGenerator;
import org.mybatis.generator.config.Configuration;
import org.mybatis.generator.config.xml.ConfigurationParser;
import org.mybatis.generator.internal.DefaultShellCallback;
import java.io.File;
import java.util.ArrayList;
import java.util.List;
public class MybatisGeneratorTest {
public void generator() throws Exception{
List<String> warnings = new ArrayList<String>();
boolean overwrite = true;
// 注意 文件路徑要絕對路徑 ,如:D:\work\mbg\src\main\resources\mbg.xml
File configFile = new File("D:\\work\\mbg\\src\\main\\resources\\mbg.xml");
ConfigurationParser cp = new ConfigurationParser(warnings);
Configuration config = cp.parseConfiguration(configFile);
DefaultShellCallback callback = new DefaultShellCallback(overwrite);
MyBatisGenerator myBatisGenerator = new MyBatisGenerator(config,callback, warnings);
myBatisGenerator.generate(null);
}
public static void main(String[] args) throws Exception {
try {
MybatisGeneratorTest app = new MybatisGeneratorTest();
app.generator();
} catch (Exception e) {
e.printStackTrace();
}
}
}
注意 上面文件的路徑,否則會報找不到文件的錯誤.