使用mybatis-generator自动生成代码

1、Maven引入：

<!-- ====================== MyBatis ORM framework          dependencies ====================== -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mybatis.generator</groupId>
            <artifactId>mybatis-generator-core</artifactId>
            <version>1.3.2</version>
            <type>jar</type>
            <scope>provided</scope>
        </dependency>

2、/src/main/resources下新建generatorConfig.xml

<?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:sourcemaven_repositorypostgresqlpostgresql9.1-901-1.jdbc4postgresql-9.1-901-1.jdbc4.jar" />
    <context id="context1">
        <property name="javaFileEncoding" value="utf-8"/>
        <property name="" value=""/>
        <!-- pagination plugin -->
        <plugin type="org.mybatis.generator.plugins.SerializablePlugin"></plugin>
        <plugin type="org.mybatis.generator.plugin.PaginationMysqlPlugin" />
        <plugin type="org.mybatis.generator.plugin.CommentPlugin" />

        <commentGenerator>
            <!-- 不生成注解信息 -->
            <property name="suppressAllComments" value="true" />
        </commentGenerator>
 
         <jdbcConnection driverClass="org.postgresql.Driver"
            connectionURL="jdbc:postgresql://10.168.xx.xx:5432/crm_cms" userId="crm" password="crm" />

        <javaTypeResolver>
            <property name="forceBigDecimals" value="false" />
        </javaTypeResolver>

        <javaModelGenerator targetPackage="com.lashou.cms.domain" targetProject="service-cms" />
        <sqlMapGenerator targetPackage="com.lashou.cms.mapper" targetProject="service-cms" />
        <javaClientGenerator targetPackage="com.lashou.cms.mapper"  targetProject="service-cms" type="XMLMAPPER" />
         <table schema="" tableName="comment_deal" domainObjectName="CommentDeal" />
         
    </context> 
</generatorConfiguration>

3、新建这两个：

CommentPlugin.java

/**
 * 
 */
package org.mybatis.generator.plugin;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;

import org.mybatis.generator.api.FullyQualifiedTable;
import org.mybatis.generator.api.IntrospectedColumn;
import org.mybatis.generator.api.IntrospectedTable;
import org.mybatis.generator.api.PluginAdapter;
import org.mybatis.generator.api.dom.java.Field;
import org.mybatis.generator.api.dom.java.TopLevelClass;
import org.mybatis.generator.internal.db.ConnectionFactory;

/**
 * @author c
 * @date 2015年9月7日
 * 
 */
public class CommentPlugin extends PluginAdapter {

    private static final String AUTHOR = "modelClassAuthor";

    public boolean modelFieldGenerated(Field field, TopLevelClass topLevelClass,
            IntrospectedColumn introspectedColumn, IntrospectedTable introspectedTable,
            ModelClassType modelClassType) {
        String remark = introspectedColumn.getRemarks();
        field.addJavaDocLine("/** " + remark + " */");

        return true;
    }

    public boolean modelBaseRecordClassGenerated(TopLevelClass topLevelClass,
            IntrospectedTable introspectedTable) {
        addModelClassComment(topLevelClass, introspectedTable);
        return true;
    }

    private void addModelClassComment(TopLevelClass topLevelClass,
            IntrospectedTable introspectedTable) {
        String remarks = "";
        String author = getProperties().getProperty(AUTHOR);
        if (null == author || "".equals(author)) {
            author = System.getProperty("user.name");
        }

        FullyQualifiedTable table = introspectedTable.getFullyQualifiedTable();
        try {
            Connection connection = ConnectionFactory.getInstance().getConnection(
                    context.getJdbcConnectionConfiguration());
            ResultSet rs = connection.getMetaData().getTables(table.getIntrospectedCatalog(),
                    table.getIntrospectedSchema(), table.getIntrospectedTableName(), null);

            if (null != rs && rs.next()) {
                remarks = rs.getString("REMARKS");
            }
            closeConnection(connection, rs);
        } catch (SQLException e) {}

        SimpleDateFormat format = new SimpleDateFormat("yyyy-M-d");
        topLevelClass.addJavaDocLine("/**");
        topLevelClass.addJavaDocLine(" * " + remarks);
        topLevelClass.addJavaDocLine(" *");
        topLevelClass.addJavaDocLine(" * @author " + author);
        topLevelClass.addJavaDocLine(" * @date " + format.format(new Date()));
        topLevelClass.addJavaDocLine(" *");
        topLevelClass.addJavaDocLine(" */");
    }

    public boolean modelRecordWithBLOBsClassGenerated(TopLevelClass topLevelClass,
            IntrospectedTable introspectedTable) {
        addModelClassComment(topLevelClass, introspectedTable);
        return true;
    }

    @Override
    public boolean validate(List<String> warnings) {
        return true;
    }

    private void closeConnection(Connection connection, ResultSet rs) {
        if (null != rs) {
            try {
                rs.close();
            } catch (SQLException e) {}
        }
        if (connection != null) {
            try {
                connection.close();
            } catch (SQLException e) {}
        }

    }
}

PaginationMysqlPlugin.java

package org.mybatis.generator.plugin;

import java.util.List;
import org.mybatis.generator.api.CommentGenerator;
import org.mybatis.generator.api.IntrospectedTable;
import org.mybatis.generator.api.PluginAdapter;
import org.mybatis.generator.api.ShellRunner;
import org.mybatis.generator.api.dom.java.Field;
import org.mybatis.generator.api.dom.java.FullyQualifiedJavaType;
import org.mybatis.generator.api.dom.java.JavaVisibility;
import org.mybatis.generator.api.dom.java.Method;
import org.mybatis.generator.api.dom.java.Parameter;
import org.mybatis.generator.api.dom.java.TopLevelClass;
import org.mybatis.generator.api.dom.xml.Attribute;
import org.mybatis.generator.api.dom.xml.TextElement;
import org.mybatis.generator.api.dom.xml.XmlElement;

/**
 * <pre>
 * add pagination using mysql limit. 
 * This class is only used in ibator code generator.
 * </pre>
 */
public class PaginationMysqlPlugin extends PluginAdapter {
    @Override
    public boolean modelExampleClassGenerated(TopLevelClass topLevelClass,
            IntrospectedTable introspectedTable) {
        // add field, getter, setter for limit clause
        addLimit(topLevelClass, introspectedTable, "limitStart");
        addLimit(topLevelClass, introspectedTable, "limitEnd");
        return super.modelExampleClassGenerated(topLevelClass,
                introspectedTable);
    }

    @Override
    public boolean sqlMapSelectByExampleWithoutBLOBsElementGenerated(
            XmlElement element, IntrospectedTable introspectedTable) {
        // XmlElement isParameterPresenteElemen = (XmlElement) element
        // .getElements().get(element.getElements().size() - 1);
//        XmlElement isNotNullElement = new XmlElement("isGreaterEqual"); //$NON-NLS-1$  
//        isNotNullElement.addAttribute(new Attribute("property", "limitStart")); //$NON-NLS-1$ //$NON-NLS-2$  
//        isNotNullElement.addAttribute(new Attribute("compareValue", "0")); //$NON-NLS-1$ //$NON-NLS-2$  
        
        XmlElement isNotNullElement = new XmlElement("if");  
        isNotNullElement.addAttribute(new Attribute("test", "limitStart >= 0"));
        isNotNullElement.addElement(new TextElement(
                " limit ${limitStart} , ${limitEnd}"));
        // isParameterPresenteElemen.addElement(isNotNullElement);
        element.addElement(isNotNullElement);
        return super.sqlMapUpdateByExampleWithoutBLOBsElementGenerated(element,
                introspectedTable);
    }

    private void addLimit(TopLevelClass topLevelClass,
            IntrospectedTable introspectedTable, String name) {
        CommentGenerator commentGenerator = context.getCommentGenerator();
        Field field = new Field();
        field.setVisibility(JavaVisibility.PROTECTED);
        field.setType(FullyQualifiedJavaType.getIntInstance());
        field.setName(name);
        field.setInitializationString("-1");
        commentGenerator.addFieldComment(field, introspectedTable);
        topLevelClass.addField(field);
        char c = name.charAt(0);
        String camel = Character.toUpperCase(c) + name.substring(1);
        Method method = new Method();
        method.setVisibility(JavaVisibility.PUBLIC);
        method.setName("set" + camel);
        method.addParameter(new Parameter(FullyQualifiedJavaType
                .getIntInstance(), name));
        method.addBodyLine("this." + name + "=" + name + ";");
        commentGenerator.addGeneralMethodComment(method, introspectedTable);
        topLevelClass.addMethod(method);
        method = new Method();
        method.setVisibility(JavaVisibility.PUBLIC);
        method.setReturnType(FullyQualifiedJavaType.getIntInstance());
        method.setName("get" + camel);
        method.addBodyLine("return " + name + ";");
        commentGenerator.addGeneralMethodComment(method, introspectedTable);
        topLevelClass.addMethod(method);
    }

    /**
     * This plugin is always valid - no properties are required
     */
    public boolean validate(List<String> warnings) {
        return true;
    }

    public static void generate() {
        String config = PaginationMysqlPlugin.class.getClassLoader()
                .getResource("mybatisConfig.xml").getFile();
        String[] arg = { "-configfile", config, "-overwrite" };
        ShellRunner.main(arg);
    }

    public static void main(String[] args) {
        generate();
    }
}

4、生成代码：

在generatorConfig.xml上右键，选择Generator Mybatis/IBATIES Artifacts