mybatis是一個(gè)支持普通sql查詢，存儲(chǔ)過程和高級(jí)映射的優(yōu)秀持久層框架。mybatis消除了幾乎所有的jdbc代碼和參數(shù)的手工設(shè)置以及對(duì)結(jié)果集的檢索封裝。mybatis可以使用簡(jiǎn)單的xml或注解用于配置和原始映射，將接口和java的pojo（plain old java objects，普通的java對(duì)象）映射成數(shù)據(jù)庫中的記錄。
1.創(chuàng)建工程,導(dǎo)入jar包
創(chuàng)建一個(gè)java工程或者web工程都可以,然后導(dǎo)入mybatis的jar包和依賴包還有數(shù)據(jù)庫的jar包,本人使用oracle10g數(shù)據(jù)庫
mybatis-3.2.2.jar 核心驅(qū)動(dòng)
asm-3.3.1.jar
cglib-2.2.2.jar
commons-logging-1.1.1.jar
javassist-3.17.1-ga.jar
log4j-1.2.17.jar
slf4j-api-1.7.5.jar
slf4j-log4j12-1.7.5.jar
classes12.jar oracle10g的jar包
2.創(chuàng)建連接數(shù)據(jù)庫的核心配置文件sqlmapconfig.xml
在src目錄底下,創(chuàng)建sqlmapconfig.xml文件
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<?xml version="1.0" encoding="utf-8" ?><!doctype configuration public "-//mybatis.org//dtd config 3.0//en" "http://mybatis.org/dtd/mybatis-3-config.dtd"><configuration> <!--配置數(shù)據(jù)源,環(huán)境--> <!--可以配置多個(gè)環(huán)境,一個(gè)測(cè)試時(shí)候用的,一個(gè)上線時(shí)候用的--> <environments default="test"> <!--測(cè)試環(huán)境--> <environment id="test"> <!--配置事務(wù) : jdbc事務(wù)/managed交給容器的事務(wù)--> <transactionmanager type="jdbc"></transactionmanager> <!--數(shù)據(jù)源 : pooled池化/unpooled非池化/jndi密碼加密,安全性高--> <datasource type="pooled"> <property name="driver" value="oracle.jdbc.oracledriver"/> <property name="url" value="jdbc:oracle:thin:@localhost:1521:orcl"/> <property name="username" value="scott"/> <property name="password" value="luogg"/> </datasource> </environment> <!--服務(wù)器環(huán)境--> <environment id="deploy"> <transactionmanager type="jdbc"></transactionmanager> <datasource type="pooled"> <property name="driver" value="oracle.jdbc.oracledriver"/> <property name="url" value="jdbc:oracle:thin:@localhost:1521:orcl"/> <property name="username" value="scott"/> <property name="password" value="luogg"/> </datasource> </environment> </environments> <mappers> <mapper resource="com/luogg/mapper/personmapper.xml"/> </mappers></configuration> |
3.在src底下創(chuàng)建test文件夾,在test文件夾下創(chuàng)建testmybatis.java文件
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package test;import com.luogg.domain.person;import org.apache.ibatis.io.resources;import org.apache.ibatis.session.sqlsession;import org.apache.ibatis.session.sqlsessionfactory;import org.apache.ibatis.session.sqlsessionfactorybuilder;import org.junit.test;import java.io.ioexception;import java.io.inputstream;import java.util.list;/** * created by luogg on 2017/2/17. */public class testmybatis { @test public void init() throws ioexception { /** * 測(cè)試數(shù)據(jù)庫的連接 * 1.定義一個(gè)string類型的變量resource,指向剛才配置的連接數(shù)據(jù)庫的xml文件 * 2.創(chuàng)建一個(gè)輸入流,來讀取我們的數(shù)據(jù)庫配置文件 * 3.輸入流創(chuàng)建工廠. * 4.有了工廠之后open工廠 */ string resource = "sqlmapconfig.xml"; inputstream is = resources.getresourceasstream(resource); sqlsessionfactory factory = new sqlsessionfactorybuilder().build(is); sqlsession session = factory.opensession();} |
此時(shí),我們可以進(jìn)行單元測(cè)試了,看看session有沒有被創(chuàng)建,綠色表示創(chuàng)建成功,那么我們接下來創(chuàng)建數(shù)據(jù)庫表,并且寫sql語句
4.創(chuàng)建數(shù)據(jù)庫,并寫入數(shù)據(jù)
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create table person( id number(2), name varchar2(20), sex number(2), age number(3))-- 寫入數(shù)據(jù),點(diǎn)擊下方鎖子按鈕,然后點(diǎn)擊＋select * from person for update |
5.在src底下創(chuàng)建com.luogg.domain包,在包下創(chuàng)建person.java的實(shí)體bean
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package com.luogg.domain;/** * created by luogg on 2017/2/17. */public class person { private string name; private int sex; private int age; private int id; @override public string tostring() { return "person{" + "name='" + name + '\'' + ", sex=" + sex + ", age=" + age + ", id=" + id + '}'; } public int getid() { return id; } public void setid(int id) { this.id = id; } public string getname() { return name; } public void setname(string name) { this.name = name; } public int getsex() { return sex; } public void setsex(int sex) { this.sex = sex; } public int getage() { return age; } public void setage(int age) { this.age = age; }} |
6.創(chuàng)建與數(shù)據(jù)庫對(duì)應(yīng)的映射文件,在src下創(chuàng)建com.luogg.mapper包下創(chuàng)建personmapper.xml文件
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<?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"><!--配置命名空間,命名空間+ .id 是唯一的sql語句標(biāo)示符--><mapper namespace="com.luogg.mapper.personmapper"> <!--查詢所有數(shù)據(jù),參數(shù)有id,resulttype結(jié)果集,parametertype參數(shù)--> <!--注意 : sql語句中如果有要填寫集合的,比如查詢所有數(shù)據(jù),返回一個(gè)person的結(jié)果集,那么resulttype參數(shù)直接寫 路徑+集合的類型 比如: 返回一個(gè)person集合,那么就填寫person bean所在的路徑+person--> <select id="find" resulttype="com.luogg.domain.person"> select * from person </select></mapper> |
7.在核心配置文件sqlmapconfig.xml中做一個(gè)映射,讓其識(shí)別我們的寫了sql語句的配置文件
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<?xml version="1.0" encoding="utf-8" ?><!doctype configuration public "-//mybatis.org//dtd config 3.0//en" "http://mybatis.org/dtd/mybatis-3-config.dtd"><configuration> <!--配置數(shù)據(jù)源,環(huán)境--> <!--可以配置多個(gè)環(huán)境,一個(gè)測(cè)試時(shí)候用的,一個(gè)上線時(shí)候用的--> <environments default="test"> <!--測(cè)試環(huán)境--> <environment id="test"> <!--配置事務(wù) : jdbc事務(wù)/managed交給容器的事務(wù)--> <transactionmanager type="jdbc"></transactionmanager> <!--數(shù)據(jù)源 : pooled池化/unpooled非池化/jndi密碼加密,安全性高--> <datasource type="pooled"> <property name="driver" value="oracle.jdbc.oracledriver"/> <property name="url" value="jdbc:oracle:thin:@localhost:1521:orcl"/> <property name="username" value="scott"/> <property name="password" value="luogg"/> </datasource> </environment> <!--服務(wù)器環(huán)境--> <environment id="deploy"> <transactionmanager type="jdbc"></transactionmanager> <datasource type="pooled"> <property name="driver" value="oracle.jdbc.oracledriver"/> <property name="url" value="jdbc:oracle:thin:@localhost:1521:orcl"/> <property name="username" value="scott"/> <property name="password" value="luogg"/> </datasource> </environment> </environments> <!--映射文件mapper--> <mappers> <mapper resource="com/luogg/mapper/personmapper.xml"/> </mappers></configuration> |
8.回到測(cè)試類testmybatis.java,訪問配置文件中的sql語句并返回結(jié)果集
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package test;import com.luogg.domain.person;import org.apache.ibatis.io.resources;import org.apache.ibatis.session.sqlsession;import org.apache.ibatis.session.sqlsessionfactory;import org.apache.ibatis.session.sqlsessionfactorybuilder;import org.junit.test;import java.io.ioexception;import java.io.inputstream;import java.util.list;/** * created by luogg on 2017/2/17. */public class testmybatis { @test public void init() throws ioexception { /** * 測(cè)試數(shù)據(jù)庫的連接 * 1.定義一個(gè)string類型的變量resource,指向剛才配置的連接數(shù)據(jù)庫的xml文件 * 2.創(chuàng)建一個(gè)輸入流,來讀取我們的數(shù)據(jù)庫配置文件 * 3.輸入流創(chuàng)建工廠. * 4.有了工廠之后open工廠 * 5.通過session訪問配置文件中的sql語句 */ string resource = "sqlmapconfig.xml"; inputstream is = resources.getresourceasstream(resource); sqlsessionfactory factory = new sqlsessionfactorybuilder().build(is); sqlsession session = factory.opensession(); //如何訪問personmapper.xml中的sql語句呢? 命名空間+ .id list<person> list = session.selectlist("com.luogg.mapper.personmapper.find"); system.out.println(list.size()); for(person p : list){ system.out.println(p); } }} |
運(yùn)行結(jié)果 :
以上所述是小編給大家介紹的mybatis框架入門學(xué)習(xí)教程，希望對(duì)大家有所幫助，如果大家有任何疑問請(qǐng)給我留言，小編會(huì)及時(shí)回復(fù)大家的。在此也非常感謝大家對(duì)服務(wù)器之家網(wǎng)站的支持！
原文鏈接：http://www.cnblogs.com/luogg/archive/2017/02/17/6410125.html
