[MyBatis]完整MyBatis CRUD工程
下载地址：https://files.cnblogs.com/files/xiandedanteng/Person191005.rar
pom.xml:这个文件主要是引入依赖
<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">
<modelVersion>4.0.0</modelVersion>
<groupId>com.hy</groupId>
<artifactId>fillMillionDatum</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>fillMillionDatum</name>
<url>http://maven.apache.org</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.3.0</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.38</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>1.7.12</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>1.7.12</version>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>
</dependencies>
</project>
mybatis-config.xml:这个文件主要配了DB连接信息和需要引入的Mapper
<?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>
<settings>
<setting name="logImpl" value="LOG4J"/>
</settings>
<environments default="development">
<environment id="development">
<transactionManager type="JDBC" />
<!-- 配置数据库连接信息 -->
<dataSource type="UNPOOLED">
<property name="driver" value="com.mysql.jdbc.Driver" />
<property name="url" value="jdbc:mysql://192.168.161.128:3306/test" />
<property name="username" value="root" />
<property name="password" value="12345678" />
</dataSource>
</environment>
</environments>
<mappers>
<mapper resource="PersonMapper.xml"></mapper>
</mappers>
</configuration>
PersonMapper.xml:这里定义进行CRUD的多条sql语句
<?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.hy.PersonMapper">
<select id="selectAll" resultType="com.hy.Person">
select id,name,enrollTime from person
</select>
<select id="insertPerson">
insert into person(id,name,enrollTime) values (#{id},#{name},#{enrolltime})
</select>
<select id="selectOneById" resultType="com.hy.Person">
select id,name,enrollTime from person where id=#{id}
</select>
<update id="updatePersonNameById" parameterType="java.util.HashMap">
update person set name=#{name} where id=#{id}
</update>
<delete id="deletePersonsMonthsAgo" parameterType="java.util.HashMap">
delete from person where enrolltime<#{date}
</delete>
</mapper>
PersonMapper接口 这个和PersonMapper文件是对应的，可以把调DB的函数写在这里，也可以在代码里用id来调用。
package com.hy;
public interface PersonMapper {
Person selectOneById(long id);
int updatePersonNameById(String name,long id);
int deletePersonsMonthsAgo(String date);
}
Person类：实体类
package com.hy;
import java.text.MessageFormat;
public class Person {
private long id;
private String name;
private String enrolltime;
public String toString() {
Object[] arr={id,name,enrolltime};
String retval=MessageFormat.format("Person id={0},name={1},enrolltime={2}", arr);
return retval;
}
public long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getEnrolltime() {
return enrolltime;
}
public void setEnrolltime(String enrolltime) {
this.enrolltime = enrolltime;
}
}
SelectAllPerson：全选方案
package com.hy;
import java.io.Reader;
import java.util.List;
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.apache.log4j.Logger;
public class SelectAllPerson {
private static Logger logger = Logger.getLogger(SelectAllPerson.class);
public static void main(String[] args) throws Exception{
long startTime = System.currentTimeMillis();
Reader reader=Resources.getResourceAsReader("mybatis-config.xml");
SqlSessionFactory ssf=new SqlSessionFactoryBuilder().build(reader);
reader.close();
SqlSession session=ssf.openSession();
try {
List<Person> list=session.selectList("selectAll");
for(Person emp:list) {
System.out.println(emp);
}
long endTime = System.currentTimeMillis();
logger.info("Time elapsed:" + toDhmsStyle((endTime - startTime)/1000) + ".");
}finally {
session.close();
}
}
// format seconds to day hour minute seconds style
// Example 5000s will be formatted to 1h23m20s
public static String toDhmsStyle(long allSeconds) {
String DateTimes = null;
long days = allSeconds / (60 * 60 * 24);
long hours = (allSeconds % (60 * 60 * 24)) / (60 * 60);
long minutes = (allSeconds % (60 * 60)) / 60;
long seconds = allSeconds % 60;
if (days > 0) {
DateTimes = days + "d" + hours + "h" + minutes + "m" + seconds + "s";
} else if (hours > 0) {
DateTimes = hours + "h" + minutes + "m" + seconds + "s";
} else if (minutes > 0) {
DateTimes = minutes + "m" + seconds + "s";
} else {
DateTimes = seconds + "s";
}
return DateTimes;
}
}
SelectOnePerson：按ID单找一个的方案
package com.hy;
import java.io.Reader;
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.apache.log4j.Logger;
public class SelectOnePerson {
private static Logger logger = Logger.getLogger(SelectOnePerson.class);
public static void main(String[] args) throws Exception{
long startTime = System.currentTimeMillis();
Reader reader=Resources.getResourceAsReader("mybatis-config.xml");
SqlSessionFactory ssf=new SqlSessionFactoryBuilder().build(reader);
reader.close();
SqlSession session=ssf.openSession();
try {
PersonMapper pm=session.getMapper(PersonMapper.class);
Person p=pm.selectOneById(9);
logger.info("Selected person="+p);
long endTime = System.currentTimeMillis();
logger.info("Time elapsed:" + toDhmsStyle((endTime - startTime)/1000) + ".");
}finally {
session.close();
}
}
// format seconds to day hour minute seconds style
// Example 5000s will be formatted to 1h23m20s
public static String toDhmsStyle(long allSeconds) {
String DateTimes = null;
long days = allSeconds / (60 * 60 * 24);
long hours = (allSeconds % (60 * 60 * 24)) / (60 * 60);
long minutes = (allSeconds % (60 * 60)) / 60;
long seconds = allSeconds % 60;
if (days > 0) {
DateTimes = days + "d" + hours + "h" + minutes + "m" + seconds + "s";
} else if (hours > 0) {
DateTimes = hours + "h" + minutes + "m" + seconds + "s";
} else if (minutes > 0) {
DateTimes = minutes + "m" + seconds + "s";
} else {
DateTimes = seconds + "s";
}
return DateTimes;
}
}
UpdatePersonName：按ID更新一个人名字的方案
package com.hy;
import java.io.Reader;
import java.util.HashMap;
import java.util.Map;
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.apache.log4j.Logger;
public class UpdatePersonName {
private static Logger logger = Logger.getLogger(UpdatePersonName.class);
public static void main(String[] args) throws Exception{
long startTime = System.currentTimeMillis();
Reader reader=Resources.getResourceAsReader("mybatis-config.xml");
SqlSessionFactory ssf=new SqlSessionFactoryBuilder().build(reader);
reader.close();
SqlSession session=ssf.openSession();
try {
Map<String, String> para=new HashMap<String, String>();
para.put("id","1");
para.put("name","Andy");
int changed=session.update("updatePersonNameById", para);
session.commit();
logger.info(changed+" record was changed.");
long endTime = System.currentTimeMillis();
logger.info("Time elapsed:" + toDhmsStyle((endTime - startTime)/1000) + ".");
}catch(Exception ex) {
session.rollback();
}finally {
session.close();
}
}
// format seconds to day hour minute seconds style
// Example 5000s will be formatted to 1h23m20s
public static String toDhmsStyle(long allSeconds) {
String DateTimes = null;
long days = allSeconds / (60 * 60 * 24);
long hours = (allSeconds % (60 * 60 * 24)) / (60 * 60);
long minutes = (allSeconds % (60 * 60)) / 60;
long seconds = allSeconds % 60;
if (days > 0) {
DateTimes = days + "d" + hours + "h" + minutes + "m" + seconds + "s";
} else if (hours > 0) {
DateTimes = hours + "h" + minutes + "m" + seconds + "s";
} else if (minutes > 0) {
DateTimes = minutes + "m" + seconds + "s";
} else {
DateTimes = seconds + "s";
}
return DateTimes;
}
}
DeletePersonMonthAgo：按日期删除一批人的方案
package com.hy;
import java.io.Reader;
import java.util.HashMap;
import java.util.Map;
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.apache.log4j.Logger;
public class DeletePersonMonthAgo {
private static Logger logger = Logger.getLogger(DeletePersonMonthAgo.class);
public static void main(String[] args) throws Exception{
long startTime = System.currentTimeMillis();
Reader reader=Resources.getResourceAsReader("mybatis-config.xml");
SqlSessionFactory ssf=new SqlSessionFactoryBuilder().build(reader);
reader.close();
SqlSession session=ssf.openSession();
try {
Map<String, String> para=new HashMap<String, String>();
para.put("date","2020-01-01 00:01:00");
int changed=session.delete("deletePersonsMonthsAgo", para);
session.commit();
logger.info(changed+" record was changed.");
long endTime = System.currentTimeMillis();
logger.info("Time elapsed:" + toDhmsStyle((endTime - startTime)/1000) + ".");
}catch(Exception ex) {
session.rollback();
}finally {
session.close();
}
}
// format seconds to day hour minute seconds style
// Example 5000s will be formatted to 1h23m20s
public static String toDhmsStyle(long allSeconds) {
String DateTimes = null;
long days = allSeconds / (60 * 60 * 24);
long hours = (allSeconds % (60 * 60 * 24)) / (60 * 60);
long minutes = (allSeconds % (60 * 60)) / 60;
long seconds = allSeconds % 60;
if (days > 0) {
DateTimes = days + "d" + hours + "h" + minutes + "m" + seconds + "s";
} else if (hours > 0) {
DateTimes = hours + "h" + minutes + "m" + seconds + "s";
} else if (minutes > 0) {
DateTimes = minutes + "m" + seconds + "s";
} else {
DateTimes = seconds + "s";
}
return DateTimes;
}
}
InsertMillionPersons：插入六百四十万条Person记录（测试用，在我的T440p的虚拟机上的CentOS6.5上的MySql数据库耗时约一小时）
package com.hy;
import java.io.Reader;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
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.apache.log4j.Logger;
public class InsertMillionPersons {
private static Logger logger = Logger.getLogger(InsertMillionPersons.class);
public static void main(String[] args) throws Exception{
Reader reader=Resources.getResourceAsReader("mybatis-config.xml");
SqlSessionFactory ssf=new SqlSessionFactoryBuilder().build(reader);
reader.close();
SqlSession session=ssf.openSession();
long startTime = System.currentTimeMillis();
try {
String currTime="2018-01-01 00:00:00";
for(long i=0;i<6400000;i++) {
currTime=timePastTenSecond(currTime);
Person emp=new Person();
emp.setId(i);
emp.setName("Person:"+String.valueOf(i));
emp.setEnrolltime(currTime);
int changed=session.insert("insertPerson", emp);
logger.info("No."+i+" changed="+changed+" time:"+currTime);
}
session.commit();
long endTime = System.currentTimeMillis();
logger.info("Time elapsed:" + toDhmsStyle((endTime - startTime)/1000) + ".");
}catch(Exception ex) {
session.rollback();
}finally {
session.close();
}
}
// 得到十秒后的时间
public static String timePastTenSecond(String otime) {
try {
SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
Date dt=sdf.parse(otime);
Calendar newTime = Calendar.getInstance();
newTime.setTime(dt);
newTime.add(Calendar.SECOND,10);//日期加10秒
Date dt1=newTime.getTime();
String retval = sdf.format(dt1);
return retval;
}
catch(Exception ex) {
ex.printStackTrace();
return null;
}
}
// format seconds to day hour minute seconds style
// Exmplae 5000s will be formatted to 1h23m20s
public static String toDhmsStyle(long allSeconds) {
String DateTimes = null;
long days = allSeconds / (60 * 60 * 24);
long hours = (allSeconds % (60 * 60 * 24)) / (60 * 60);
long minutes = (allSeconds % (60 * 60)) / 60;
long seconds = allSeconds % 60;
if (days > 0) {
DateTimes = days + "d" + hours + "h" + minutes + "m" + seconds + "s";
} else if (hours > 0) {
DateTimes = hours + "h" + minutes + "m" + seconds + "s";
} else if (minutes > 0) {
DateTimes = minutes + "m" + seconds + "s";
} else {
DateTimes = seconds + "s";
}
return DateTimes;
}
}
InsertPersons：插入数条Person记录
package com.hy;
import java.io.Reader;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
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.apache.log4j.Logger;
public class InsertPersons {
private static Logger logger = Logger.getLogger(InsertPersons.class);
public static void main(String[] args) throws Exception{
Reader reader=Resources.getResourceAsReader("mybatis-config.xml");
SqlSessionFactory ssf=new SqlSessionFactoryBuilder().build(reader);
reader.close();
SqlSession session=ssf.openSession();
long startTime = System.currentTimeMillis();
try {
String currTime="2018-01-01 00:00:00";
for(long i=0;i<10;i++) {
currTime=timePastTenSecond(currTime);
Person emp=new Person();
emp.setId(i);
emp.setName("Person:"+String.valueOf(i));
emp.setEnrolltime(currTime);
int changed=session.insert("insertPerson", emp);
logger.info("No."+i+" changed="+changed+" time:"+currTime);
}
session.commit();
long endTime = System.currentTimeMillis();
logger.info("Time elapsed:" + toDhmsStyle((endTime - startTime)/1000) + ".");
logger.info("Insert 10 persons completed.");
}catch(Exception ex) {
session.rollback();
}finally {
session.close();
}
}
public static String timePastTenSecond(String otime) {
try {
SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
Date dt=sdf.parse(otime);
Calendar newTime = Calendar.getInstance();
newTime.setTime(dt);
newTime.add(Calendar.SECOND,10);//日期加10秒
Date dt1=newTime.getTime();
String retval = sdf.format(dt1);
return retval;
}
catch(Exception ex) {
ex.printStackTrace();
return null;
}
}
// format seconds to day hour minute seconds style
// Exmplae 5000s will be formatted to 1h23m20s
public static String toDhmsStyle(long allSeconds) {
String DateTimes = null;
long days = allSeconds / (60 * 60 * 24);
long hours = (allSeconds % (60 * 60 * 24)) / (60 * 60);
long minutes = (allSeconds % (60 * 60)) / 60;
long seconds = allSeconds % 60;
if (days > 0) {
DateTimes = days + "d" + hours + "h" + minutes + "m" + seconds + "s";
} else if (hours > 0) {
DateTimes = hours + "h" + minutes + "m" + seconds + "s";
} else if (minutes > 0) {
DateTimes = minutes + "m" + seconds + "s";
} else {
DateTimes = seconds + "s";
}
return DateTimes;
}
}
使用这个程序，往一张Person表中插6,,400,000条记录花费约59分，删除3，153，605条记录（2019年1月1日之前）约用41秒，删除3153600条记录(2020年1月1日之前)约用49秒。
为什么在远程Oracle数据库上删花费时间要长的多？
--END-- 2019年10月5日20:39:39
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