mybatis 简单项目步骤

mybatis.xml

<?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>
<environments default="development">
<environment id="development">
<transactionManager type="JDBC" />
<dataSource type="POOLED">
<property name="driver" value="oracle.jdbc.driver.OracleDriver" />
<property name="url" value="jdbc:oracle:thin:@localhost:1521:XE" />
<property name="username" value="project" />
<property name="password" value="1234" />
</dataSource>
</environment>
</environments>
<mappers>
<mapper resource="com/oracle/mapper/StudentMapper.xml" />
</mappers>
</configuration>

获取数据源

public class MyBatisSqlSession {

// 获取数据源
private static String resource = "mybatis.xml";
private static InputStream inputStream = null;
private static SqlSessionFactory sqlSessionFactory = null;

static {
try {
inputStream = Resources.getResourceAsStream(resource);
sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
} catch (IOException e) {
e.printStackTrace();
}
}

public static SqlSession getSession() {
return sqlSessionFactory.openSession();
}

}

mapper.xml

<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<!--  namespace配置的是dao接口-->
<mapper namespace="com.oracle.dao.IStudentMapperDao">
<!--#{}固定写法，中间的值是属性值
id 属性值就是接口里面的方法名-->
<insert id="saveStudent" parameterType="com.oracle.pojo.Student">
<!-- keycolum表的字段，keyproperty属性 order=before在insert语句执行之前执行-->
<selectKey keyColumn="id" keyProperty="id" resultType="java.lang.Long" order="BEFORE">
select student_seq.nextval as id from dual
</selectKey>
insert into student (id, name, address, gender,age) values (
#{id}, #{name}, #{address}, #{gender},#{age})
</insert>

<select id="getStudentById" parameterType="java.lang.Long" resultType="java.util.HashMap">
select * from student where id=#{id}
</select>

<resultMap type="com.oracle.pojo.Student" id="studentResultMap">
<id column="id" property="id" javaType="long" jdbcType="BIGINT" />
<result column="name" property="name" javaType="string" jdbcType="VARCHAR"/>
<result column="address" property="address" javaType="string" jdbcType="VARCHAR"/>
<result column="gender" property="gender" javaType="string" jdbcType="VARCHAR"/>
<result column="age" property="age" javaType="int" jdbcType="INTEGER"/>
</resultMap>

<select id="getStudent" parameterType="java.lang.Long" resultMap="studentResultMap">
select * from student where id=#{id}
</select>

<select id="getStudentByParam22222" parameterType="java.util.HashMap" resultMap="studentResultMap">
select * from student where id=#{id} and address=#{address}
</select>

<sql id="studentsql"> id,name ,address,gender,age </sql>
<sql id="wheresql"> address=#{address} </sql>

<select id="getStudentByParam" parameterType="java.lang.String" resultType="java.util.HashMap">
select <include refid="studentsql"></include> from student where <include refid="wheresql"></include>
</select>

<delete id="deleteStudent" parameterType="long">
delete from student where id=#{id}
</delete>

<update id="updateStudent" parameterType="java.util.HashMap" >
update student set address=#{address} where id=#{id}
</update>

<select id="selectByCondition" parameterType="com.oracle.pojo.Student" resultType="com.oracle.pojo.Student" >
select id,name,address,gender,age
from student
where 1=1
<if test="id != null">
and id = #{id}
</if>
<if test="name != null">
and name = #{name}
</if>
<if test="address != null">
and address like #{address}
</if>
<if test="gender != null">
and gender = #{gender}
</if>
<if test="age != 0">
and age = #{age}
</if>
</select>

<sql id="key">
<trim suffixOverrides=",">
id,
<if test="name !=null">
name,
</if>
<if test="address !=null">
address,
</if>
<if test="gender != null">
gender,
</if>
<if test="age != 0">
age,
</if>
</trim>
</sql>
<sql id="values">
<trim suffixOverrides=",">
#{id},
<if test="name !=null">
#{name},
</if>
<if test="address !=null">
#{address},
</if>
<if test="gender != null">
#{gender},
</if>
<if test="age != 0">
#{age},
</if>
</trim>
</sql>
<insert id="dynainsert" parameterType="com.oracle.pojo.Student" >
<selectKey keyColumn="id" keyProperty="id" resultType="java.lang.Long" order="BEFORE">
select student_seq.nextval as id from dual
</selectKey>
insert into student(<include refid="key"></include>) values (<include refid="values"></include>)
</insert>

<delete id="dynaDeleteArray" >
delete student where id in
<foreach collection="array" open="(" close=")" separator="," item="ids">
#{ids}
</foreach>
</delete>

<delete id="dynaDeleteList">
delete from students where students_id in
<foreach collection="list" open="(" close=")" separator="," item="ids">
#{ids}
</foreach>
</delete>

<update id="dynaUpdate" parameterType="com.oracle.pojo.Student">
update student
<set>
<if test="address !=null">
address = #{address},
</if>
<if test="age!=0">
age = #{age},
</if>
</set>
where id=#{id}
</update>

</mapper>

dao

public interface StudentDao {
public int save(Student stu);

public List query();
}

test

public class Student_Test {

public static void main(String[] args) {
SqlSession session = MyBatisSqlSession.getSession();
StudentDao mapper = session.getMapper(StudentDao.class);

//        List list = mapper.query();
//        System.out.println(list.size());

Student stu=new Student();
stu.setName("qqqqqqq");
stu.setAge(100);
int save = mapper.save(stu);
session.commit();
}

}

实体类忽略，

必须的jar包，mabatis.jar,ojdbc.jar,和一个log4j用来输出日志

log4j配置文件名：/MyWeb7.12/src/log4j.properties

log4j.rootLogger = debug ,  stdout

log4j.appender.stdout = org.apache.log4j.ConsoleAppender

log4j.appender.stdout.Target = System.out

log4j.appender.stdout.layout = org.apache.log4j.PatternLayout

log4j.appender.stdout.layout.ConversionPattern =  %d %p [%c] - %m%n

log4j.logger.com.ibatis=debug

log4j.logger.com.ibatis.common.jdbc.SimpleDataSource=debug

log4j.logger.com.ibatis.common.jdbc.ScriptRunner=debug

log4j.logger.com.ibatis.sqlmap.engine.impl.SqlMapClientDelegate=debug

log4j.logger.java.sql.Connection=debug

log4j.logger.java.sql.Statement=debug

log4j.logger.java.sql.PreparedStatement=debug,stdout