mybatis代码自动生成Demo

mybatis代码自动生成Demo

package com.chao.plugins;

import org.mybatis.generator.api.CommentGenerator;
import org.mybatis.generator.api.IntrospectedTable;
import org.mybatis.generator.api.PluginAdapter;
import org.mybatis.generator.api.dom.java.*;
import org.mybatis.generator.api.dom.xml.Attribute;
import org.mybatis.generator.api.dom.xml.Document;
import org.mybatis.generator.api.dom.xml.TextElement;
import org.mybatis.generator.api.dom.xml.XmlElement;

import java.util.List;

/**
 * Created by zhaochaochao on 2015/1/8.
 */
public class MySQLPagePlugin extends PluginAdapter {
    @Override
    public boolean modelExampleClassGenerated(TopLevelClass topLevelClass,
            IntrospectedTable introspectedTable) {
        // add field, getter, setter for limit clause
        addPage(topLevelClass, introspectedTable, "page");
        return super.modelExampleClassGenerated(topLevelClass,
                introspectedTable);
    }

    @Override
    public boolean sqlMapDocumentGenerated(Document document,
            IntrospectedTable introspectedTable) {
        XmlElement parentElement = document.getRootElement();

        // 产生分页语句
        XmlElement paginationSuffixElement = new XmlElement("sql");
        paginationSuffixElement.addAttribute(new Attribute("id", "PageSuffix"));
        XmlElement pageEnd = new XmlElement("if");
        pageEnd.addAttribute(new Attribute("test", "page != null"));
        pageEnd.addElement(new TextElement("limit #{page.begin},#{page.length}"));
        paginationSuffixElement.addElement(pageEnd);
        parentElement.addElement(paginationSuffixElement);

        return super.sqlMapDocumentGenerated(document, introspectedTable);
    }

    @Override
    public boolean sqlMapSelectByExampleWithoutBLOBsElementGenerated(
            XmlElement element, IntrospectedTable introspectedTable) {

        XmlElement pageElement = new XmlElement("include"); //$NON-NLS-1$
        pageElement.addAttribute(new Attribute("refid", "PageSuffix"));
        element.getElements().add(pageElement);

        return super.sqlMapUpdateByExampleWithoutBLOBsElementGenerated(element,
                introspectedTable);
    }

    private void addPage(TopLevelClass topLevelClass,
            IntrospectedTable introspectedTable, String name) {
        String pageClass = "com.chao.plugins.Page";
        topLevelClass.addImportedType(new FullyQualifiedJavaType(pageClass));
        CommentGenerator commentGenerator = context.getCommentGenerator();
        Field field = new Field();
        field.setVisibility(JavaVisibility.PROTECTED);
        field.setType(new FullyQualifiedJavaType("Page"));
        field.setName(name);
        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(new FullyQualifiedJavaType(pageClass), name));
        method.addBodyLine("this." + name + "=" + name + ";");
        commentGenerator.addGeneralMethodComment(method, introspectedTable);
        topLevelClass.addMethod(method);
        method = new Method();
        method.setVisibility(JavaVisibility.PUBLIC);
        method.setReturnType(new FullyQualifiedJavaType(pageClass));
        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;
    }
}