使用maven配置基本Mybatis

Mybatis 也称为是ibatis，主要体现在普通、底层SQL查询、存储过程、高级映射的持久化框架！

优点：                   

                 1.消除了几乎所有的JBDC代码、参数！

                 2.手动设置以及结果集的检索

                 3.简化了xml、注解配置和对象关系映射

                 4.将接口、pojo映射成数据库中的记录

对比Hibernate：

                1.配置文件中获取-sessionfactory

                2.从sessionfactory中得到session

                3.在session中完成增删改查操作，完成后并自动关闭！

                4.java 对象和 数据库之间有做mapping 的配置文件

一、使用Maven：创建Web工程，右键点击configure，选择Convert Maven Project

二、编辑pom.xml：加入以下代码！

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
                  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0http://maven.apache.org/xsd/maven-4.0.0.xsd">
                  <modelVersion>4.0.0</modelVersion>
                  <groupId>mabatis_v1.0</groupId>
                  <artifactId>mabatis_v1.0</artifactId>
                  <version>0.0.1-SNAPSHOT</version>
                  <packaging>war</packaging>
                  <build>
                   <sourceDirectory>src</sourceDirectory>
                   <plugins>
                    <plugin>
                     <artifactId>maven-compiler-plugin</artifactId>
                     <version>3.3</version>
                     <configuration>
                      <source>1.8</source>
                      <target>1.8</target>
                     </configuration>
                    </plugin>
                    <plugin>
                     <artifactId>maven-war-plugin</artifactId>
                     <version>2.6</version>
                     <configuration>
                      <warSourceDirectory>WebContent</warSourceDirectory>
                      <failOnMissingWebXml>false</failOnMissingWebXml>
                     </configuration>
                    </plugin>
                   </plugins>
                  </build>
                  <!-- 依赖关系 -->
                  <dependencies>
                  <!-- ibatis.jar
从网络获取，则不需要手动导入ibatis的jar包！-->
                   <dependency>
                    <groupId>org.mybatis</groupId>
                    <artifactId>mybatis</artifactId>
                    <version>3.2.8</version>
                   </dependency>
                  <!-- junit.jar
-->
                   <dependency>
                    <groupId>junit</groupId>
                    <artifactId>junit</artifactId>
                    <version>4.10</version>
                   </dependency>
                  </dependencies>
                 </project>

三、创建java类，必须对应数据库中：字段、数据类型

四、创建java对象与数据库之间的xml文件

<?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">
                 <!--
命名空间mapper：com.model.professional -->
                 <mapper
namespace="com.model.professional">
                 <select id="selectUserById"
parameterType="int" resultType="professional">
                 <!-- 底层的SQL语句
-->
                 select * from PROFESSIONAL_INFOTB
where PROFESSIONAL_ID=#{PROFESSIONAL_ID}
                 </select>
                 </mapper>

五、创建confg.xml文件，并注册：创建java对象与数据库之间的xml文件

<?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>
                 <!-- 注册对象的空间命名
-->
                 <environments
default="development">
                 <environment
id="development">
                 <transactionManager
type="JDBC"/>
                 <dataSource
type="POOLED">
                 <!--
1.加载数据库驱动：oracle.jdbc.driver.OracleDriver -->
                 <property name="driver"
value="oracle.jdbc.driver.OracleDriver"/>
                 <!--
2.数据库连接地址：oracle.jdbc.driver.OracleDriver -->
                 <property name="url"
value="jdbc:oracle:thin:@localhost:1521:orcl"/>
                 <!-- 数据库用户...
-->
                 <property name="username"
value="ED"/>
                 <!-- 数据库密码... -->
                 <property name="password"
value="admin"/>
                 </dataSource>
                 </environment>
                 </environments>
                 <!-- 注册映射文件：java对象与数据库之间的xml文件路径！
-->
                 </configuration>

六、创建SqlSessionFactory，获取session，完成简单查询！