深入理解Mybatis(第一讲)——手写ORM框架(简…
2020-06-01 16:10:25来源:博客园 阅读 ()
深入理解Mybatis(第一讲)——手写ORM框架(简易版Mybatis)
我们来自定义一个持久层框架,也就是Mybatis的简易版。
使用端的搭建
idea中新建maven工程IPersistence_test:
在resources目录下新建sqlMapConfig.xml文件,
<Configuration>
<dataSource>
<property name="driverClass" value="com.mysql.jdbc.Driver"></property>
<property name="jdbcUrl" value="jdbc:mysql://localhost:3306/lagou?useUnicode=true&characterEncoding=utf8&zeroDateTimeBehavior=convertToNull&useSSL=false"></property>
<property name="user" value="root"></property>
<property name="password" value="000"></property>
</dataSource>
<mapper resource="UserMapper.xml"></mapper>
</Configuration>
UserMapper.xml:
<mapper namespace="user">
<select id="selectOne" paramterType="com.lagou.pojo.User"
resultType="com.lagou.pojo.User">
select * from user where id = #{id} and username =#{username}
</select>
<select id="selectList" resultType="com.lagou.pojo.User">
select * from user
</select>
</mapper>
User实体类:
package com.lagou.test;
/**
* @author liuyj
* @Title: User
* @create 2020-05-29 15:06
* @ProjectName lagou_project
* @Description: TODO
*/
public class User {
private Integer id;
private String username;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
@Override
public String toString() {
return "User{" +
"id=" + id +
", username='" + username + '\'' +
'}';
}
}
使用端暂时就搭建完成。
持久层框架端的搭建
下面我们来搭建持久层框架:
新建一个module,maven项目:IPersistence
pom.xml中引入一下依赖
<dependencies>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.44</version>
</dependency>
<!-- 连接池-->
<dependency>
<groupId>c3p0</groupId>
<artifactId>c3p0</artifactId>
<version>0.9.1.2</version>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.12</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.10</version>
</dependency>
<!-- 解析xml文件-->
<dependency>
<groupId>dom4j</groupId>
<artifactId>dom4j</artifactId>
<version>1.6.1</version>
</dependency>
<dependency>
<groupId>jaxen</groupId>
<artifactId>jaxen</artifactId>
<version>1.1.6</version>
</dependency>
</dependencies>
创建一个Configuration类,主要是存放从sqlMapConfig.xml和Usermapper.xml配置文件中解析出来的一些元素和内容,用来一层层向下传递:
package com.lagou.pojo;
import javax.sql.DataSource;
import java.util.HashMap;
import java.util.Map;
/**
* @author liuyj
* @Title: Configuration
* @create 2020-05-27 15:20
* @ProjectName IPersistence
* @Description: 存放sqlMapConfig.xml解析出来的内容
*/
public class Configuration {
//存放数据库配置信息,从sqlMapConfig.xml中解析出来
private DataSource dataSource;
//存放Mapper.xml中解析出来的内容,key是statementId
private Map<String,MappedStatement> mappedStatementMap=new HashMap<String, MappedStatement>();
public DataSource getDataSource() {
return dataSource;
}
public void setDataSource(DataSource dataSource) {
this.dataSource = dataSource;
}
public Map<String, MappedStatement> getMappedStatementMap() {
return mappedStatementMap;
}
public void setMappedStatementMap(Map<String, MappedStatement> mappedStatementMap) {
this.mappedStatementMap = mappedStatementMap;
}
}
其中DataSource 封装的是数据库信息,Configuration中封装了一个对象MappedStatement:
package com.lagou.pojo;
/**
* @author liuyj
* @Title: MappedStatement
* @create 2020-05-27 15:13
* @ProjectName IPersistence
* @Description: 存放UserMapper.xml解析出来的内容
*/
public class MappedStatement {
//id标识
private String id;
//返回值类型
private String resultType;
//传入参数类型
private String paramenterType;
//sql
private String sql;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getResultType() {
return resultType;
}
public void setResultType(String resultType) {
this.resultType = resultType;
}
public String getParamenterType() {
return paramenterType;
}
public void setParamenterType(String paramenterType) {
this.paramenterType = paramenterType;
}
public String getSql() {
return sql;
}
public void setSql(String sql) {
this.sql = sql;
}
}
主要是用来存储从映射配置文件中解析出来的sql查询标签的id及传入参数、返回结果类型、查询的sql等,其中Mapper.xml中每一个标签,
比如:
<select id="selectList" resultType="com.lagou.pojo.User">
select * from user
</select>
都会封装成一个MappedStatement对象,然后所有的MappedStatement对象都被存储到Configuration类中的Map集合mappedStatementMap当中去,Map集合中的key是statementId(statementId由两部分组成,一是Mapper.xml中的namespace,二是每一个标签中的id,比如UserMapper.xml中的selectOne,在Configuration中map集合中的key值就是user.selectOne)。
Resource文件:
主要用来读取xml文件,作为一个字节流存储在内存中:
package com.lagou.io;
import java.io.InputStream;
/**
* @author liuyj
* @Title:
* @create 2020-05-27 14:48
* @ProjectName IPersistence
* @Description: TODO
*/
public class Resources {
//根据配置文件的路径,将配置文件加载成字节输入流,存储在内存中
public static InputStream getResourceAsStream(String path){
InputStream resourceStream= Resources.class.getClassLoader().getResourceAsStream(path);
return resourceStream;
}
}
SqlSessionFactoryBuilder:
package com.lagou.sqlSession;
import com.lagou.config.XMLConfigBuilder;
import com.lagou.pojo.Configuration;
import org.dom4j.DocumentException;
import java.beans.PropertyVetoException;
import java.io.InputStream;
/**
* @author liuyj
* @Title: SqlSessionFactoryBuilder
* @create 2020-05-27 15:37
* @ProjectName IPersistence
* @Description: TODO
*/
public class SqlSessionFactoryBuilder {
public SqlSessionFactory build(InputStream in) throws DocumentException, PropertyVetoException {
//第一,使用dom4j解析配置文件,将解析出来的内容封装到configuration中
XMLConfigBuilder xmlConfigBuilder=new XMLConfigBuilder();
Configuration configuration = xmlConfigBuilder.parseConfig(in);
//第二:创建sqlSessionFactory对象:工厂类:生产sqlSession:会话对象
DefaultSqlSessionFactory defaultSqlSessionFactory=new DefaultSqlSessionFactory(configuration);
return defaultSqlSessionFactory;
}
}
XMLConfigBuilder :
使用dom4j解析sqlMapConfig.xml文件,并调用XMLMapperBuilder 中的方法解析Mapper.xml映射文件,将结果封装在Configuration对象中:
package com.lagou.config;
import com.lagou.io.Resources;
import com.lagou.pojo.Configuration;
import com.mchange.v2.c3p0.ComboPooledDataSource;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;
import java.beans.PropertyVetoException;
import java.io.InputStream;
import java.util.List;
import java.util.Properties;
/**
* @author liuyj
* @Title: XMLConfigBuilder
* @create 2020-05-27 15:39
* @ProjectName IPersistence
* @Description: TODO
*/
public class XMLConfigBuilder {
private Configuration configuration;
public XMLConfigBuilder(){
this.configuration=new Configuration();
}
/**
*
*该方法就是使用dom4j将配置文件解析,封装为Configuration
*/
public Configuration parseConfig(InputStream inputStream) throws DocumentException, PropertyVetoException {
Document document = new SAXReader().read(inputStream);
//<Configuration>标签
Element rootElement = document.getRootElement();
List<Element> list = rootElement.selectNodes("//property");
Properties properties=new Properties();
for (Element element : list) {
String name = element.attributeValue("name");
String value = element.attributeValue("value");
properties.setProperty(name,value);
}
ComboPooledDataSource comboPooledDataSource=new ComboPooledDataSource();
comboPooledDataSource.setDriverClass(properties.getProperty("driverClass"));
comboPooledDataSource.setJdbcUrl(properties.getProperty("jdbcUrl"));
comboPooledDataSource.setUser(properties.getProperty("user"));
comboPooledDataSource.setPassword(properties.getProperty("password"));
configuration.setDataSource(comboPooledDataSource);
//解析sqlMapConfig.xml里面的mapper标签,
// 解析mapper.xml:拿到路径--字节输入流--dom4j解析
List<Element> mapperList = rootElement.selectNodes("//mapper");
for (Element element : mapperList) {
String mapperPath = element.attributeValue("resource");
InputStream resourceAsStream = Resources.getResourceAsStream(mapperPath);
XMLMapperBuilder xmlMaperBuilder=new XMLMapperBuilder(configuration);
xmlMaperBuilder.parse(resourceAsStream);
}
return configuration;
}
}
XMLMapperBuilder :
用来解析映射配置文件Mapper.xml中的内容:
package com.lagou.config;
import com.lagou.pojo.Configuration;
import com.lagou.pojo.MappedStatement;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;
import java.io.InputStream;
import java.util.List;
/**
* @author liuyj
* @Title: XMLMapperBuilder
* @create 2020-05-28 10:59
* @ProjectName lagou_project
* @Description: 解析mapper.xml文件
*/
public class XMLMapperBuilder {
private Configuration configuration;
public XMLMapperBuilder(Configuration configuration) {
this.configuration=configuration;
}
public void parse(InputStream inputStream) throws DocumentException {
Document document = new SAXReader().read(inputStream);
Element rootElement = document.getRootElement();
String namespace = rootElement.attributeValue("namespace");
List<Element> list = rootElement.selectNodes("//select");
for (Element element : list) {
String id = element.attributeValue("id");
String parameterType = element.attributeValue("parameterType");
String resultType = element.attributeValue("resultType");
String sqlText = element.getTextTrim();
String key=namespace+"."+id;
MappedStatement mappedStatement=new MappedStatement();
mappedStatement.setId(id);
mappedStatement.setParamenterType(parameterType);
mappedStatement.setResultType(resultType);
mappedStatement.setSql(sqlText);
configuration.getMappedStatementMap().put(key,mappedStatement);
}
}
}
package com.lagou.sqlSession;
/**
* @author liuyj
* @Title: SqlSessionFactory
* @create 2020-05-27 15:38
* @ProjectName IPersistence
* @Description: TODO
*/
public interface SqlSessionFactory {
SqlSession openSession();
}
package com.lagou.sqlSession;
import com.lagou.pojo.Configuration;
/**
* @author liuyj
* @Title: DefaultSqlSessionFactory
* @create 2020-05-28 11:38
* @ProjectName lagou_project
* @Description: TODO
*/
public class DefaultSqlSessionFactory implements SqlSessionFactory{
private Configuration configuration;
public DefaultSqlSessionFactory(Configuration configuration) {
this.configuration = configuration;
}
public SqlSession openSession() {
return new DefaultSqlSession(configuration);
}
}
SqlSession及实现类DefaultSqlSession:
package com.lagou.sqlSession;
import java.util.List;
/**
* @author liuyj
* @Title: SqlSession
* @create 2020-05-28 11:56
* @ProjectName lagou_project
* @Description: TODO
*/
public interface SqlSession {
//查询所有
public <E> List<E> selectList(String statementid, Object... params) throws Exception;
//根据条件查询单个
public <T> T selectOne(String statementid,Object... params) throws Exception;
}
package com.lagou.sqlSession;
import com.lagou.pojo.Configuration;
import com.lagou.pojo.MappedStatement;
import java.lang.reflect.*;
import java.util.List;
/**
* @author liuyj
* @Title: DefaultSqlSession
* @create 2020-05-28 11:57
* @ProjectName lagou_project
* @Description: TODO
*/
public class DefaultSqlSession implements SqlSession {
private Configuration configuration;
public DefaultSqlSession(Configuration configuration) {
this.configuration = configuration;
}
public <E> List<E> selectList(String statementid, Object... params) throws Exception {
//将要去完成对simpleExecutor里的query方法的调用
SimpleExecutor simpleExecutor = new SimpleExecutor();
MappedStatement mappedStatement = configuration.getMappedStatementMap().get(statementid);
List<Object> list = simpleExecutor.query(configuration, mappedStatement, params);
return (List<E>) list;
}
public <T> T selectOne(String statementid, Object... params) throws Exception {
List<Object> objects = selectList(statementid, params);
if(objects.size()==1){
return (T) objects.get(0);
}else {
throw new RuntimeException("查询结果为空或者返回结果过多");
}
}
}
SqlSession实现类中调用的Executor及其实现类SimpleExecutor :
package com.lagou.sqlSession;
import com.lagou.pojo.Configuration;
import com.lagou.pojo.MappedStatement;
import java.util.List;
/**
* @author lyj
* @Title: Executor
* @ProjectName lagou_project
* @Description: TODO
* @date 2020/5/28 22:00
*/
public interface Executor {
public <E> List<E> query(Configuration configuration, MappedStatement mappedStatement, Object... params) throws Exception;
}
package com.lagou.sqlSession;
import com.lagou.pojo.Configuration;
import com.lagou.pojo.MappedStatement;
import com.lagou.utils.GenericTokenParser;
import com.lagou.utils.ParameterMapping;
import com.lagou.utils.ParameterMappingTokenHandler;
import java.beans.PropertyDescriptor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.sql.*;
import java.util.ArrayList;
import java.util.List;
/**
* @author lyj
* @Title: SimpleExecutor
* @ProjectName lagou_project
* @Description: TODO
* @date 2020/5/28 21:59
*/
public class SimpleExecutor implements Executor {
public <E> List<E> query(Configuration configuration, MappedStatement mappedStatement, Object... params) throws Exception {
//注册驱动,获取数据库连接
Connection connection = configuration.getDataSource().getConnection();
//获取sql语句:select * from user where id=#{id} and username=#{username}
//转换sql:select * from user where id=? and username=?,同时需要对#{}里面的值进行解析存储
String sql = mappedStatement.getSql();
BoundSql boundSql=getBoundSql(sql);
//获取预处理对象preparedStatement
PreparedStatement preparedStatement = connection.prepareStatement(boundSql.getSqlText());
//设置参数
//获取到了参数的全路径
String paramenterType = mappedStatement.getParamenterType();
Class<?> parametertypeClass=getClassType(paramenterType);
List<ParameterMapping> parameterMappingList = boundSql.getParameterMappingList();
for (int i = 0; i < parameterMappingList.size(); i++) {
ParameterMapping parameterMapping = parameterMappingList.get(i);
String content = parameterMapping.getContent();
//反射
Field declaredField = parametertypeClass.getDeclaredField(content);
//暴力访问
declaredField.setAccessible(true);
Object o = declaredField.get(params[0]);
preparedStatement.setObject(i+1,o);
}
//执行sql
ResultSet resultSet = preparedStatement.executeQuery();
String resultType = mappedStatement.getResultType();
Class<?> resultTypeClass = getClassType(resultType);
ArrayList<Object> objects = new ArrayList<Object>();
//封装返回结果集
while (resultSet.next()) {
Object o = resultTypeClass.newInstance();
//元数据
ResultSetMetaData metaData = resultSet.getMetaData();
for (int i = 1; i <= metaData.getColumnCount(); i++) {
//字段名
String columnName = metaData.getColumnName(i);
//字段值
Object value = resultSet.getObject(columnName);
//使用反射或者内省,根据数据库表和实体的对应关系,完成封装
PropertyDescriptor propertyDescriptor = new PropertyDescriptor(columnName, resultTypeClass);
Method writeMethod = propertyDescriptor.getWriteMethod();
writeMethod.invoke(o,value);
}
objects.add(o);
}
return (List<E>) objects;
}
/**
* 完成对#{}的解析工作:1.将#{}使用?代替 ,2.解析出#{}里面的值进行存储
* @param sql
* @return
*/
private BoundSql getBoundSql(String sql) {
//标记处理类:配置标记解析器GenericTokenParser来完成对配置文件的解析工作,其中TokenHandler主要完成处理
ParameterMappingTokenHandler parameterMappingTokenHandler=new ParameterMappingTokenHandler();
//GenericTokenParser:通用的标记解析器,完成了对代码中占位符的解析,然后再根据给定的标记处理器(TokenHandler)来进行表达式的处理
//三个参数:分别为openToken(开始标记)、closeToken(结束标记)、handler(标记处理器)
GenericTokenParser genericTokenParser=new GenericTokenParser("#{","}",parameterMappingTokenHandler);
//解析出来的sql
String parseSql = genericTokenParser.parse(sql);
//从#{}里面解析出来的参数名称
List<ParameterMapping> parameterMappings = parameterMappingTokenHandler.getParameterMappings();
BoundSql boundSql=new BoundSql(parseSql,parameterMappings);
return boundSql;
}
}
BoundSql
package com.lagou.sqlSession;
import com.lagou.utils.ParameterMapping;
import java.util.ArrayList;
import java.util.List;
/**
* @author lyj
* @Title: BoundSql
* @ProjectName lagou_project
* @Description: TODO
* @date 2020/5/28 22:03
*/
public class BoundSql {
private String sqlText;
private List<ParameterMapping>parameterMappingList=new ArrayList<ParameterMapping>();
public BoundSql(String sqlText, List<ParameterMapping> parameterMappingList) {
this.sqlText = sqlText;
this.parameterMappingList = parameterMappingList;
}
public String getSqlText() {
return sqlText;
}
public void setSqlText(String sqlText) {
this.sqlText = sqlText;
}
public List<ParameterMapping> getParameterMappingList() {
return parameterMappingList;
}
public void setParameterMappingList(List<ParameterMapping> parameterMappingList) {
this.parameterMappingList = parameterMappingList;
}
}
SimpleExecutor 中使用的几个标记解析器,也附录一下吧,是从mybatis源码中直接拿来用的:
GenericTokenParser
package com.lagou.utils;
/**
* @author Clinton Begin
*/
public class GenericTokenParser {
private final String openToken; //开始标记
private final String closeToken; //结束标记
private final TokenHandler handler; //标记处理器
public GenericTokenParser(String openToken, String closeToken, TokenHandler handler) {
this.openToken = openToken;
this.closeToken = closeToken;
this.handler = handler;
}
/**
* 解析${}和#{}
* @param text
* @return
* 该方法主要实现了配置文件、脚本等片段中占位符的解析、处理工作,并返回最终需要的数据。
* 其中,解析工作由该方法完成,处理工作是由处理器handler的handleToken()方法来实现
*/
public String parse(String text) {
// 验证参数问题,如果是null,就返回空字符串。
if (text == null || text.length()==0) {
return "";
}
// 下面继续验证是否包含开始标签,如果不包含,默认不是占位符,直接原样返回即可,否则继续执行。
int start = text.indexOf(openToken, 0);
if (start == -1) {
return text;
}
// 把text转成字符数组src,并且定义默认偏移量offset=0、存储最终需要返回字符串的变量builder,
// text变量中占位符对应的变量名expression。判断start是否大于-1(即text中是否存在openToken),如果存在就执行下面代码
char[] src = text.toCharArray();
int offset = 0;
final StringBuilder builder = new StringBuilder();
StringBuilder expression = null;
while (start > -1) {
// 判断如果开始标记前如果有转义字符,就不作为openToken进行处理,否则继续处理
if (start > 0 && src[start - 1] == '\\') {
builder.append(src, offset, start - offset - 1).append(openToken);
offset = start + openToken.length();
} else {
//重置expression变量,避免空指针或者老数据干扰。
if (expression == null) {
expression = new StringBuilder();
} else {
expression.setLength(0);
}
builder.append(src, offset, start - offset);
offset = start + openToken.length();
int end = text.indexOf(closeToken, offset);
while (end > -1) {////存在结束标记时
if (end > offset && src[end - 1] == '\\') {//如果结束标记前面有转义字符时
// this close token is escaped. remove the backslash and continue.
expression.append(src, offset, end - offset - 1).append(closeToken);
offset = end + closeToken.length();
end = text.indexOf(closeToken, offset);
} else {//不存在转义字符,即需要作为参数进行处理
expression.append(src, offset, end - offset);
offset = end + closeToken.length();
break;
}
}
if (end == -1) {
// close token was not found.
builder.append(src, start, src.length - start);
offset = src.length;
} else {
//首先根据参数的key(即expression)进行参数处理,返回?作为占位符
builder.append(handler.handleToken(expression.toString()));
offset = end + closeToken.length();
}
}
start = text.indexOf(openToken, offset);
}
if (offset < src.length) {
builder.append(src, offset, src.length - offset);
}
return builder.toString();
}
}
ParameterMapping:
package com.lagou.utils;
public class ParameterMapping {
private String content;
public ParameterMapping(String content) {
this.content = content;
}
public String getContent() {
return content;
}
public void setContent(String content) {
this.content = content;
}
}
ParameterMappingTokenHandler:
package com.lagou.utils;
import java.util.ArrayList;
import java.util.List;
public class ParameterMappingTokenHandler implements TokenHandler {
private List<ParameterMapping> parameterMappings = new ArrayList<ParameterMapping>();
// context是参数名称 #{id} #{username}
public String handleToken(String content) {
parameterMappings.add(buildParameterMapping(content));
return "?";
}
private ParameterMapping buildParameterMapping(String content) {
ParameterMapping parameterMapping = new ParameterMapping(content);
return parameterMapping;
}
public List<ParameterMapping> getParameterMappings() {
return parameterMappings;
}
public void setParameterMappings(List<ParameterMapping> parameterMappings) {
this.parameterMappings = parameterMappings;
}
}
package com.lagou.utils;
/**
* @author Clinton Begin
*/
public interface TokenHandler {
String handleToken(String content);
}
测试使用:
先生成jar包,执行mvn install命令。
mvn install
在使用端IPersistence_test中引入jar包:
<dependency>
<groupId>com.lagou</groupId>
<artifactId>IPersistence</artifactId>
<version>1.0-SNAPSHOT</version>
</dependency>
数据库建表:
测试:
package com.lagou.test;
import com.lagou.dao.IUserDao;
import com.lagou.io.Resources;
import com.lagou.sqlSession.SqlSession;
import com.lagou.sqlSession.SqlSessionFactory;
import com.lagou.sqlSession.SqlSessionFactoryBuilder;
import org.dom4j.DocumentException;
import org.junit.Before;
import org.junit.Test;
import java.beans.PropertyVetoException;
import java.io.InputStream;
/**
* @author liuyj
* @Title: IPersistenctTest
* @create 2020-05-27 15:08
* @ProjectName IPersistence
* @Description: TODO
*/
public class IPersistenctTest {
private SqlSession sqlSession;
@Before
public void before() throws PropertyVetoException, DocumentException {
InputStream resourceAsStream = Resources.getResourceAsStream("sqlMapConfig.xml");
SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(resourceAsStream);
sqlSession = sqlSessionFactory.openSession();
}
@Test
public void test() throws Exception {
//调用
User user=new User();
user.setId(1);
user.setUsername("张三");
User user2 = sqlSession.selectOne("user.selectOne", user);
System.out.println(user2);
}
}
运行结果:
大功告成。
下节我们来讲对于我们这个框架的一个优化。
原文链接:https://www.cnblogs.com/liuyj-top/p/13025871.html
如有疑问请与原作者联系
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