MyBatis01 Idea中搭建MyBatis开发环境

项目结构

POM模板

<?xml version="1.0" encoding="UTF-8"?>

<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/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>ssm</artifactId>
        <groupId>com.etc</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>chapter01</artifactId>
    <packaging>war</packaging>

    <name>chapter01 Maven Webapp</name>
    <!-- FIXME change it to the project's website -->
    <url>http://www.example.com</url>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.7</maven.compiler.source>
        <maven.compiler.target>1.7</maven.compiler.target>
    </properties>

    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.11</version>
            <scope>test</scope>
        </dependency>
        <!-- https://mvnrepository.com/artifact/log4j/log4j -->
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.17</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.13</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.4.6</version>
        </dependency>
    </dependencies>

    <build>
        <finalName>chapter01</finalName>
        <pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
            <plugins>
                <plugin>
                    <artifactId>maven-clean-plugin</artifactId>
                    <version>3.1.0</version>
                </plugin>
                <!-- see http://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_war_packaging -->
                <plugin>
                    <artifactId>maven-resources-plugin</artifactId>
                    <version>3.0.2</version>
                </plugin>
                <plugin>
                    <artifactId>maven-compiler-plugin</artifactId>
                    <version>3.8.0</version>
                </plugin>
                <plugin>
                    <artifactId>maven-surefire-plugin</artifactId>
                    <version>2.22.1</version>
                </plugin>
                <plugin>
                    <artifactId>maven-war-plugin</artifactId>
                    <version>3.2.2</version>
                </plugin>
                <plugin>
                    <artifactId>maven-install-plugin</artifactId>
                    <version>2.5.2</version>
                </plugin>
                <plugin>
                    <artifactId>maven-deploy-plugin</artifactId>
                    <version>2.8.2</version>
                </plugin>

                <!-- 查看源代码 -->
                <plugin>
                    <groupId>org.apache.maven.plugins</groupId>
                    <artifactId>maven-source-plugin</artifactId>
                    <version>3.0.1</version>
                    <executions>
                        <execution>
                            <id>attach-sources</id>
                            <phase>verify</phase>
                            <goals>
                                <goal>jar-no-fork</goal>
                            </goals>
                        </execution>
                    </executions>
                </plugin>

                <!-- 查看文档 -->
                <plugin>
                    <groupId>org.apache.maven.plugins</groupId>
                    <artifactId>maven-javadoc-plugin</artifactId>
                    <version>3.0.1</version>
                    <executions>
                        <execution>
                            <id>attach-javadocs</id>
                            <goals>
                                <goal>jar</goal>
                            </goals>
                        </execution>
                    </executions>
                </plugin>

            </plugins>
        </pluginManagement>

        <!--引入资源文件:包括dao下的mapper.xml文件-->
        <resources>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.xml</include>
                </includes>
                <filtering>true</filtering>
            </resource>
            <resource>
                <directory>src/main/resources</directory>
                <filtering>true</filtering>
            </resource>
        </resources>
    </build>
</project>

　　

database.properties

driver=com.mysql.cj.jdbc.Driver
url=jdbc\:mysql\://localhost:3306/#?useUnicode=true&characterEncoding=utf8&serverTimezone=GMT%2B8&useSSL=false&allowPublicKeyRetrieval=true
username=#
password=#

　　

mybatis配置文件

<?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>
    <!-- 引入数据库属性配置文件 -->
    <properties resource="database.properties"/>
    <!--<properties>-->
    <!--<property name="driver" value="com.mysql.jdbc.Driver" />-->
    <!--<property name="url" value="jdbc:mysql://localhost:3306/#" />-->
    <!--<property name="username" value="#" />-->
    <!--<property name="password" value="#" />-->
    <!--</properties>-->
    <!--配置mybatis的日志处理：Log4j -->
    <settings>
        <setting name="logImpl" value="LOG4J"/>
    </settings>
    <typeAliases>
        <!-- <typeAlias alias="user" type="com.etc.entity.User" /> -->
        <package name="com.etc.entity"/>
    </typeAliases>
    <!--设置mybatis的运行环境，通过过default指定其中一种环境-->
    <environments default="development">
        <environment id="development">
            <!--使用JDBC事务管理-->
            <transactionManager type="JDBC"/>
            <!--使用mybatis数据源POOLED-->
            <dataSource type="POOLED">
                <property name="driver" value="${driver}"/>
                <property name="url" value="${url}"/>
                <property name="username" value="${username}"/>
                <property name="password" value="${password}"/>
            </dataSource>
        </environment>
        <environment id="jnditest">
            <!--使用JDBC事务管理-->
            <transactionManager type="JDBC"/>
            <!--使用JNDI数据源，JNDI需要在tomcat配置文件中进行配置-->
            <dataSource type="JNDI">
                <property name="data_source" value="java:comp/env/jndi/mybatis"/>
            </dataSource>
        </environment>
    </environments>
    <mappers>
        <mapper resource="com/etc/dao/UserMapper.xml"/>
    </mappers>
</configuration>

　　

配置文件节点的出现有顺序，否则配置文件会报错。

　　

mybaitis映射文件

<?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">
<mapper namespace="com.etc.dao.UserMapper">
    <!-- 统计用户表人数 -->
    <select id="count" resultType="int">
		SELECT COUNT(1) as count FROM smbms_user
	</select>

    <select id="listUser" resultType="User">
		SELECT * FROM smbms_user
	</select>

</mapper>

　　

DAO

package com.etc.dao;

import java.util.List;

import com.etc.entity.User;

public interface UserMapper {

	/** 统计用户人数 */
	int count();

	/** 查询全部用户 */
	List<User> listUser();

}