[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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