自定义框架设计
使用端：
提供核⼼配置⽂件：
sqlMapConfig.xml : 存放数据源信息，引⼊mapper.xml
Mapper.xml : sql语句的配置⽂件信息
框架端：
1.读取配置⽂件
读取完成以后以流的形式存在，我们不能将读取到的配置信息以流的形式存放在内存中，不好操作，可以创建javaBean来存储
（1）Configuration : 存放数据库基本信息、Map<唯⼀标识，Mapper>
唯⼀标识：namespace + "."+ id
（2）MappedStatement：sql语句、statement类型、输⼊参数java类型、输出参数java类型
2.解析配置⽂件
创建sqlSessionFactoryBuilder类：
⽅法：sqlSessionFactory build()：
第⼀：使⽤dom4j解析配置⽂件，将解析出来的内容封装到Configuration和MappedStatement中
第⼆：创建SqlSessionFactory的实现类DefaultSqlSession
3.创建SqlSessionFactory：
⽅法：openSession() : 获取sqlSession接⼝的实现类实例对象
4.创建sqlSession接⼝及实现类：主要封装crud⽅法
⽅法：selectList(String statementId,Object param)：查询所有
selectOne(String statementId,Object param)：查询单个
具体实现：封装JDBC完成对数据库表的查询操作
涉及到的设计模式：
Builder构建者设计模式、⼯⼚模式、代理模式
自定义框架实现
首先看一下整体结构
框架端：
使用端：
1.建库建表
/*
Navicat Premium Data Transfer
Source Server : mysql
Source Server Type : MySQL
Source Server Version : 80026
Source Host : 47.100.15.29:3306
Source Schema : zdy_mybatis
Target Server Type : MySQL
Target Server Version : 80026
File Encoding : 65001
Date: 29/11/2021 13:59:31
*/
SET NAMES utf8mb4;
SET FOREIGN_KEY_CHECKS = 0;
-- ----------------------------
-- Table structure for user
-- ----------------------------
DROP TABLE IF EXISTS `user`;
CREATE TABLE `user` (
`id` int(0) NOT NULL,
`username` varchar(50) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
PRIMARY KEY (`id`) USING BTREE
) ENGINE = InnoDB CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;
-- ----------------------------
-- Records of user
-- ----------------------------
INSERT INTO `user` VALUES (1, '小邹');
INSERT INTO `user` VALUES (2, '琪琪');
SET FOREIGN_KEY_CHECKS = 1;
在使⽤端（zdy-mybatis_test）项⽬中创建配置⽂件
2.创建 sqlMapConfig.xml
<configuration>
<!--数据库配置信息-->
<dataSource>
<property name="driverClass" value="com.mysql.cj.jdbc.Driver"/>
<property name="jdbcUrl" value="jdbc:mysql://localhost:3306/zdy_mybatis"/>
<property name="username" value="root"/>
<property name="password" value="root"/>
</dataSource>
<!--存放mapper.xml的全路径-->
<mapper resource="UserMapper.xml"/>
</configuration>
3.UserMapper.xml
<mapper namespace="com.zou.dao.IUserDao">
<!--sql的唯一标识：namespace.id来组成 ： statementId-->
<select id="findAll" resultType="com.zou.pojo.User" >
select * from user
</select>
<select id="findByCondition" resultType="com.zou.pojo.User" paramterType="com.zou.pojo.User">
select * from user where id = #{id} and username = #{username}
</select>
</mapper>
4.User实体类
package com.zou.pojo;
/**
* @author: 邹祥发
* @date: 2021/11/29 08:43
*/
public class User {
private Integer id;
private String username;
@Override
public String toString() {
return "User{" +
"id=" + id +
", username='" + 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;
}
}
5.再创建⼀个框架端（zdy-mybatis）并且导⼊需要⽤到的依赖坐标
<?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">
<modelVersion>4.0.0</modelVersion>
<groupId>com.zou</groupId>
<artifactId>zdy-mybatis</artifactId>
<version>1.0</version>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.encoding>UTF-8</maven.compiler.encoding>
<java.version>1.8</java.version>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.26</version>
</dependency>
<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>
<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>
</project>
6.Configuration
package com.zou.pojo;
import javax.sql.DataSource;
import java.util.HashMap;
import java.util.Map;
/**
* @author: 邹祥发
* @date: 2021/11/29 08:51
*/
public class Configuration {
private DataSource dataSource;
/**
* key: statementid
* value:封装好的mappedStatement对象
*/
Map<String, MappedStatement> mappedStatementMap = new HashMap<>();
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;
}
}
7.MappedStatement
package com.zou.pojo;
/**
* @author: 邹祥发
* @date: 2021/11/29 08:53
*/
public class MappedStatement {
//id标识
private String id;
//返回值类型
private String resultType;
//参数值类型
private String paramterType;
//sql语句
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 getParamterType() {
return paramterType;
}
public void setParamterType(String paramterType) {
this.paramterType = paramterType;
}
public String getSql() {
return sql;
}
public void setSql(String sql) {
this.sql = sql;
}
}
8.Resources
package com.zou.io;
import java.io.InputStream;
/**
* @author: 邹祥发
* @date: 2021/11/29 08:57
*/
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 getResourceAsSteam(String path) {
return Resources.class.getClassLoader().getResourceAsStream(path);
}
}
9.SqlSessionFactoryBuilder
package com.zou.sqlSession;
import com.zou.config.XMLConfigBuilder;
import com.zou.pojo.Configuration;
import org.dom4j.DocumentException;
import java.beans.PropertyVetoException;
import java.io.InputStream;
/**
* @author: 邹祥发
* @date: 2021/11/29 08:58
*/
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;
}
}
10.XMLConfigerBuilder
package com.zou.config;
import com.zou.io.Resources;
import com.zou.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: 邹祥发
* @date: 2021/11/29 09:01
*/
public class XMLConfigBuilder {
private final Configuration configuration;
public XMLConfigBuilder() {
this.configuration = new Configuration();
}
/**
* 该方法就是使用dom4j对配置文件进行解析，封装Configuration
*/
public Configuration parseConfig(InputStream inputStream) throws DocumentException, PropertyVetoException {
Document document = new SAXReader().read(inputStream);
//<configuration>
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);
}
//连接池
ComboPooledDataSource comboPooledDataSource = new ComboPooledDataSource();
comboPooledDataSource.setDriverClass(properties.getProperty("driverClass"));
comboPooledDataSource.setJdbcUrl(properties.getProperty("jdbcUrl"));
comboPooledDataSource.setUser(properties.getProperty("username"));
comboPooledDataSource.setPassword(properties.getProperty("password"));
//填充 configuration
configuration.setDataSource(comboPooledDataSource);
//mapper.xml解析: 拿到路径--字节输入流--dom4j进行解析
List<Element> mapperList = rootElement.selectNodes("//mapper");
for (Element element : mapperList) {
String mapperPath = element.attributeValue("resource");
InputStream resourceAsSteam = Resources.getResourceAsSteam(mapperPath);
XMLMapperBuilder xmlMapperBuilder = new XMLMapperBuilder(configuration);
xmlMapperBuilder.parse(resourceAsSteam);
}
return configuration;
}
}
11.XMLMapperBuilder
package com.zou.config;
import com.zou.pojo.Configuration;
import com.zou.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: 邹祥发
* @date: 2021/11/29 09:17
*/
public class XMLMapperBuilder {
private final 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 resultType = element.attributeValue("resultType");
String paramterType = element.attributeValue("paramterType");
//sql语句
String sqlText = element.getTextTrim();
//封装 mappedStatement
MappedStatement mappedStatement = new MappedStatement();
mappedStatement.setId(id);
mappedStatement.setResultType(resultType);
mappedStatement.setParamterType(paramterType);
mappedStatement.setSql(sqlText);
//statementId
String key = namespace + "." + id;
//填充 configuration
configuration.getMappedStatementMap().put(key, mappedStatement);
}
}
}
12.sqlSessionFactory 接⼝及DefaultSqlSessionFactory 实现类
package com.zou.sqlSession;
/**
* @author: 邹祥发
* @date: 2021/11/29 09:50
*/
public interface SqlSessionFactory {
public SqlSession openSession();
}
package com.zou.sqlSession;
import com.zou.pojo.Configuration;
/**
* @author: 邹祥发
* @date: 2021/11/29 09:51
*/
public class DefaultSqlSessionFactory implements SqlSessionFactory {
private final Configuration configuration;
public DefaultSqlSessionFactory(Configuration configuration) {
this.configuration = configuration;
}
@Override
public SqlSession openSession() {
return new DefaultSqlSession(configuration);
}
}
13.sqlSession 接⼝及 DefaultSqlSession 实现类
package com.zou.sqlSession;
import java.util.List;
/**
* @author: 邹祥发
* @date: 2021/11/29 09:52
*/
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;
//为Dao接口生成代理实现类
public <T> T getMapper(Class<?> mapperClass);
}
package com.zou.sqlSession;
import com.zou.pojo.Configuration;
import com.zou.pojo.MappedStatement;
import java.lang.reflect.*;
import java.util.List;
/**
* @author: 邹祥发
* @date: 2021/11/29 09:53
*/
public class DefaultSqlSession implements SqlSession {
private final Configuration configuration;
public DefaultSqlSession(Configuration configuration) {
this.configuration = configuration;
}
@Override
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;
}
@Override
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");
}
}
@Override
public <T> T getMapper(Class<?> mapperClass) {
// 使用JDK动态代理来为Dao接口生成代理对象，并返回
Object proxyInstance = Proxy.newProxyInstance(DefaultSqlSession.class.getClassLoader(), new Class[]{mapperClass}, new InvocationHandler() {
@Override
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
// 底层都还是去执行JDBC代码 //根据不同情况，来调用selctList或者selectOne
// 准备参数 1：statmentid :sql语句的唯一标识：namespace.id= 接口全限定名.方法名
// 方法名：findAll
String methodName = method.getName();
String className = method.getDeclaringClass().getName();
String statementId = className + "." + methodName;
// 准备参数2：params:args
// 获取被调用方法的返回值类型
Type genericReturnType = method.getGenericReturnType();
// 判断是否进行了 泛型类型参数化
if (genericReturnType instanceof ParameterizedType) {
return selectList(statementId, args);
}
return selectOne(statementId, args);
}
});
return (T) proxyInstance;
}
}
14.Executor
package com.zou.sqlSession;
import com.zou.pojo.Configuration;
import com.zou.pojo.MappedStatement;
import java.util.List;
/**
* @author: 邹祥发
* @date: 2021/11/29 09:55
*/
public interface Executor {
public <E> List<E> query(Configuration configuration, MappedStatement mappedStatement, Object... params) throws Exception;
}
15.SimpleExecutor
package com.zou.sqlSession;
import com.zou.config.BoundSql;
import com.zou.pojo.Configuration;
import com.zou.pojo.MappedStatement;
import com.zou.utils.GenericTokenParser;
import com.zou.utils.ParameterMapping;
import com.zou.utils.ParameterMappingTokenHandler;
import java.beans.PropertyDescriptor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.util.ArrayList;
import java.util.List;
/**
* @author: 邹祥发
* @date: 2021/11/29 09:56
*/
public class simpleExecutor implements Executor {
@Override //user
public <E> List<E> query(Configuration configuration, MappedStatement mappedStatement, Object... params) throws Exception {
// 1. 注册驱动，获取连接
Connection connection = configuration.getDataSource().getConnection();
// 2. 获取sql语句 : select * from user where id = #{id} and username = #{username}
//转换sql语句： select * from user where id = ? and username = ? ，转换的过程中，还需要对#{}里面的值进行解析存储
String sql = mappedStatement.getSql();
BoundSql boundSql = getBoundSql(sql);
// 3.获取预处理对象：preparedStatement
PreparedStatement preparedStatement = connection.prepareStatement(boundSql.getSqlText());
// 4. 设置参数
//获取到了参数的全路径
String paramterType = mappedStatement.getParamterType();
Class<?> paramtertypeClass = getClassType(paramterType);
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 = paramtertypeClass.getDeclaredField(content);
//暴力访问
declaredField.setAccessible(true);
Object o = declaredField.get(params[0]);
preparedStatement.setObject(i + 1, o);
}
// 5. 执行sql
ResultSet resultSet = preparedStatement.executeQuery();
String resultType = mappedStatement.getResultType();
Class<?> resultTypeClass = getClassType(resultType);
ArrayList<Object> objects = new ArrayList<>();
// 6. 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);
// 字段的值
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;
}
private Class<?> getClassType(String paramterType) throws ClassNotFoundException {
if (paramterType != null) {
return Class.forName(paramterType);
}
return null;
}
/**
* 完成对#{}的解析工作：1.将#{}使用？进行代替，2.解析出#{}里面的值进行存储
*
*/
private BoundSql getBoundSql(String sql) {
//标记处理类：配置标记解析器来完成对占位符的解析处理工作
ParameterMappingTokenHandler parameterMappingTokenHandler = new ParameterMappingTokenHandler();
GenericTokenParser genericTokenParser = new GenericTokenParser("#{", "}", parameterMappingTokenHandler);
//解析出来的sql
String parseSql = genericTokenParser.parse(sql);
//#{}里面解析出来的参数名称
List<ParameterMapping> parameterMappings = parameterMappingTokenHandler.getParameterMappings();
return new BoundSql(parseSql, parameterMappings);
}
}
16.BoundSql
package com.zou.config;
import com.zou.utils.ParameterMapping;
import java.util.List;
/**
* @author: 邹祥发
* @date: 2021/11/29 10:02
*/
public class BoundSql {
//解析过后的sql
private String sqlText;
private List<ParameterMapping> parameterMappingList;
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;
}
}
17.ParameterMapping
package com.zou.utils;
/**
* @author: 邹祥发
* @date: 2021/11/29 10:05
*/
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;
}
}
18.GenericTokenParser
package com.zou.utils;
/**
* @author: 邹祥发
* @date: 2021/11/29 10:07
*/
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#{}
*
* @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.isEmpty()) {
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();
}
}
19.TokenHandler
package com.zou.utils;
/**
* @author: 邹祥发
* @date: 2021/11/29 10:08
*/
public interface TokenHandler {
String handleToken(String content);
}
20.ParameterMappingTokenHandler
package com.zou.utils;
import java.util.ArrayList;
import java.util.List;
/**
* @author: 邹祥发
* @date: 2021/11/29 10:08
*/
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) {
return new ParameterMapping(content);
}
public List<ParameterMapping> getParameterMappings() {
return parameterMappings;
}
public void setParameterMappings(List<ParameterMapping> parameterMappings) {
this.parameterMappings = parameterMappings;
}
}
21.在框架端先clear，再install。并在使用端引入maven坐标
<?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">
<modelVersion>4.0.0</modelVersion>
<groupId>com.zou</groupId>
<artifactId>zdy-mabatis_test</artifactId>
<version>1.0</version>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.encoding>UTF-8</maven.compiler.encoding>
<java.version>1.8</java.version>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
</properties>
<!--引入自定义持久层框架的依赖-->
<dependencies>
<dependency>
<groupId>com.zou</groupId>
<artifactId>zdy-mybatis</artifactId>
<version>1.0</version>
</dependency>
</dependencies>
</project>
22.编写log4j.properties日志文件
log4j.rootLogger=WARN, stdout
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d %p [%c] - %m%n
23.编写测试类
package com.zou.test;
import com.zou.dao.IUserDao;
import com.zou.io.Resources;
import com.zou.pojo.User;
import com.zou.sqlSession.SqlSession;
import com.zou.sqlSession.SqlSessionFactory;
import com.zou.sqlSession.SqlSessionFactoryBuilder;
import org.junit.Test;
import java.io.InputStream;
import java.util.List;
/**
* @author: 邹祥发
* @date: 2021/11/29 10:17
*/
public class CustomTest {
@Test
public void test() throws Exception {
InputStream resourceAsSteam = Resources.getResourceAsSteam("sqlMapConfig.xml");
SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(resourceAsSteam);
SqlSession sqlSession = sqlSessionFactory.openSession();
//调用
User user = new User();
user.setId(1);
user.setUsername("小邹");
IUserDao userDao = sqlSession.getMapper(IUserDao.class);
List<User> userList = userDao.findAll();
for (User users : userList) {
System.out.println(users);
}
}
}
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