Development environment to build mybatis

1. Create Project

   <groupId>com.hope</groupId>
     <artifactId>day01_eesy_01mybatis</artifactId>
<version>1.0-SNAPSHOT</version>
    <packaging>jar</packaging>

2, add mybatis coordinates

Add the following coordinates in pom.xml:

<dependencies>
      <dependency>
     <groupId>org.mybatis</groupId>
    <artifactId>mybatis</artifactId>
    <version>3.4.5</version>
    </dependency>
   <dependency>
   <groupId>mysql</groupId>
   <artifactId>mysql-connector-java</artifactId>
   <version>5.1.6</version>
   </dependency>
   <dependency>
   <groupId>log4j</groupId>
   <artifactId>log4j</artifactId>
   <version>1.2.12</version>
   </dependency>
   <dependency>
   <groupId>junit</groupId>
   <artifactId>junit</artifactId>
   <version>4.12</version>
   </dependency>
</dependencies>

3, the preparation of the entity classes and interfaces dao

4. Preparation member mapping file interface persistence layer IUserDao.xml

   Requirements:
      Create positions: persistence layer interfaces must be on the same package.
      Name: the file name must be named to the persistence layer interface name, extension is .xml.

IUserDao.xml

<?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">
<mapper namespace="com.hope.dao.IUserDao">

<select id="findAll">
select * from user;
</select>
</mapper>

5, write SqlMapConfig.xml profile

<? xml Version = "1.0" encoding = "UTF-8"?> 
<DOCTYPE the Configuration! 
        the PUBLIC "- // mybatis.org//DTD Config 3.0 // EN" 
        "http://mybatis.org/dtd/mybatis config.dtd--3 "> 
<configuration> 
    <-! configuration environment -> 
    <environments default =" mysql "> 
        <-! mysql configuration environment -> 
        <environment ID =" mysql "> 
            <! - - transaction type configuration -> 
            <the transactionManager type = "the JDBC" /> 
            <-! configuration data source (connection pool) -> 
            <type the dataSource = "the POOLED"> 
                <-! four basic system configuration information of the database - -> 
                <Property name = "Driver" value = "com.mysql.jdbc.Driver"/>
                <property name="url" value="jdbc:mysql://localhost:3306/eesy"/>
                <Property name = "username" value = "the root" /> 
                <Property name = "password" value = "123" /> 
            </ the dataSource> 
        </ Environment> 
    </ Environments> 

    <-! mapping configuration file specifies the location , mapping configuration file refers to each separate profiles dao -> 
    <by mappers> 
        <Resource Mapper = "COM / Hope / dao / IUserDao.xml" /> 
    </ by mappers> 
</ configuration> 
. 6, write test classes 
write test classes 2.2.7 
/ ** 
* 
* <the p-> the Title: MybatisTest </ the p-> 
* <the p-> the Description: test mybatis environment </ the p-> 
* <the p-> Company: http://www.itheima.com / </ p>
* / 
Public class MybatisTest { 
public static void main (String [] args) throws Exception {
          //. 1. Read the configuration file
= Resources.getResourceAsStream in InputStream ( "SqlMapConfig.xml"); 
. 2 // create SqlSessionFactory of builders target 
the SqlSessionFactoryBuilder the SqlSessionFactoryBuilder Builder = new new (); 
. // 3 using builders to create a factory object SqlSessionFactory 
SqlSessionFactory Factory's builder.build = ( in); 
.. 4 // the SqlSession produced using SqlSessionFactory 
SqlSession factory.openSession the session = (); 
.. 5 // SqlSession created using the interface proxy object dao 
IUserDao userDao = session.getMapper (IUserDao.class); 
// use. 6. All methods proxy object executes the query 
List <the User> Users userDao.findAll = (); 
for (the User User: Users) { 
System.out.println (User); 
} 
.. 7 // release resources 
Session.close (); 
in. Close (); 
} 
}

Development environment to build mybatis

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