第二篇：mybatis核心接口
2024-05-28 09:26:57
基本上mybatis的官网已经提供了很完善的入门文档，参考这个基本就可以明白了
https://mybatis.org/mybatis-3/zh/getting-started.htmlz
主要的入门步骤有以下几步
1. 配置mybatis-config.xml文件，也是核心的文件，包含了类型转换器，别名注册器，环境等
2. 配置mapper文件，也就是映射数据表的文件，每张表都有一个映射文件
3. 根据mybatis-config.xml创建SqlSessionFactory
4. 根据SqlSessionFactory获取SqlSession
5. 操作
package com.zxc.study.test.utils;import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;public class FactoryUtils {public static SqlSessionFactory sqlSessionFactory() {return sqlSessionFactory(null);}public static SqlSessionFactory sqlSessionFactory(Properties properties) {String resource = "mybatis-config.xml";InputStream inputStream = null;try {inputStream = Resources.getResourceAsStream(resource);} catch (IOException e) {e.printStackTrace();}return new SqlSessionFactoryBuilder().build(inputStream, properties);}
}//调用测试package com.zxc.study.test.sqlsession;import com.zxc.study.test.bean.User;
import com.zxc.study.test.mapper.UserMapper;
import com.zxc.study.test.utils.FactoryUtils;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;import java.util.Properties;public class SqlSessionTest {public static void main(String[] args) {Properties properties = new Properties();SqlSessionFactory sqlSessionFactory = FactoryUtils.sqlSessionFactory(properties);SqlSession sqlSession = sqlSessionFactory.openSession();Object selectOne = sqlSession.selectOne("com.zxc.study.test.mapper.UserMapper.selectUser", 1);System.out.println(selectOne);//新的使用，通过接口获取UserMapper userMapper = sqlSession.getMapper(UserMapper.class);User user = userMapper.selectUser(1);System.out.println("通过接口获取" + user);}
}
关键的核心接口
SqlSessionFactory ： 用于生成SqlSession的工厂
/*** Copyright 2009-2016 the original author or authors.** Licensed under the Apache License, Version 2.0 (the "License");* you may not use this file except in compliance with the License.* You may obtain a copy of the License at** http://www.apache.org/licenses/LICENSE-2.0** Unless required by applicable law or agreed to in writing, software* distributed under the License is distributed on an "AS IS" BASIS,* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.* See the License for the specific language governing permissions and* limitations under the License.*/
package org.apache.ibatis.session;import java.sql.Connection;/*** Creates an {@link SqlSession} out of a connection or a DataSource* * @author Clinton Begin*/
public interface SqlSessionFactory {SqlSession openSession();SqlSession openSession(boolean autoCommit);SqlSession openSession(Connection connection);SqlSession openSession(TransactionIsolationLevel level);SqlSession openSession(ExecutorType execType);SqlSession openSession(ExecutorType execType, boolean autoCommit);SqlSession openSession(ExecutorType execType, TransactionIsolationLevel level);SqlSession openSession(ExecutorType execType, Connection connection);Configuration getConfiguration();}
SqlSession ： 用于操作数据库的session接口
/*** Copyright 2009-2016 the original author or authors.** Licensed under the Apache License, Version 2.0 (the "License");* you may not use this file except in compliance with the License.* You may obtain a copy of the License at** http://www.apache.org/licenses/LICENSE-2.0** Unless required by applicable law or agreed to in writing, software* distributed under the License is distributed on an "AS IS" BASIS,* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.* See the License for the specific language governing permissions and* limitations under the License.*/
package org.apache.ibatis.session;import java.io.Closeable;
import java.sql.Connection;
import java.util.List;
import java.util.Map;import org.apache.ibatis.cursor.Cursor;
import org.apache.ibatis.executor.BatchResult;/*** The primary Java interface for working with MyBatis.* Through this interface you can execute commands, get mappers and manage transactions.** @author Clinton Begin*/
public interface SqlSession extends Closeable {/*** Retrieve a single row mapped from the statement key* @param <T> the returned object type* @param statement* @return Mapped object*/<T> T selectOne(String statement);/*** Retrieve a single row mapped from the statement key and parameter.* @param <T> the returned object type* @param statement Unique identifier matching the statement to use.* @param parameter A parameter object to pass to the statement.* @return Mapped object*/<T> T selectOne(String statement, Object parameter);/*** Retrieve a list of mapped objects from the statement key and parameter.* @param <E> the returned list element type* @param statement Unique identifier matching the statement to use.* @return List of mapped object*/<E> List<E> selectList(String statement);/*** Retrieve a list of mapped objects from the statement key and parameter.* @param <E> the returned list element type* @param statement Unique identifier matching the statement to use.* @param parameter A parameter object to pass to the statement.* @return List of mapped object*/<E> List<E> selectList(String statement, Object parameter);/*** Retrieve a list of mapped objects from the statement key and parameter,* within the specified row bounds.* @param <E> the returned list element type* @param statement Unique identifier matching the statement to use.* @param parameter A parameter object to pass to the statement.* @param rowBounds Bounds to limit object retrieval* @return List of mapped object*/<E> List<E> selectList(String statement, Object parameter, RowBounds rowBounds);/*** The selectMap is a special case in that it is designed to convert a list* of results into a Map based on one of the properties in the resulting* objects.* Eg. Return a of Map[Integer,Author] for selectMap("selectAuthors","id")* @param <K> the returned Map keys type* @param <V> the returned Map values type* @param statement Unique identifier matching the statement to use.* @param mapKey The property to use as key for each value in the list.* @return Map containing key pair data.*/<K, V> Map<K, V> selectMap(String statement, String mapKey);/*** The selectMap is a special case in that it is designed to convert a list* of results into a Map based on one of the properties in the resulting* objects.* @param <K> the returned Map keys type* @param <V> the returned Map values type* @param statement Unique identifier matching the statement to use.* @param parameter A parameter object to pass to the statement.* @param mapKey The property to use as key for each value in the list.* @return Map containing key pair data.*/<K, V> Map<K, V> selectMap(String statement, Object parameter, String mapKey);/*** The selectMap is a special case in that it is designed to convert a list* of results into a Map based on one of the properties in the resulting* objects.* @param <K> the returned Map keys type* @param <V> the returned Map values type* @param statement Unique identifier matching the statement to use.* @param parameter A parameter object to pass to the statement.* @param mapKey The property to use as key for each value in the list.* @param rowBounds Bounds to limit object retrieval* @return Map containing key pair data.*/<K, V> Map<K, V> selectMap(String statement, Object parameter, String mapKey, RowBounds rowBounds);/*** A Cursor offers the same results as a List, except it fetches data lazily using an Iterator.* @param <T> the returned cursor element type.* @param statement Unique identifier matching the statement to use.* @return Cursor of mapped objects*/<T> Cursor<T> selectCursor(String statement);/*** A Cursor offers the same results as a List, except it fetches data lazily using an Iterator.* @param <T> the returned cursor element type.* @param statement Unique identifier matching the statement to use.* @param parameter A parameter object to pass to the statement.* @return Cursor of mapped objects*/<T> Cursor<T> selectCursor(String statement, Object parameter);/*** A Cursor offers the same results as a List, except it fetches data lazily using an Iterator.* @param <T> the returned cursor element type.* @param statement Unique identifier matching the statement to use.* @param parameter A parameter object to pass to the statement.* @param rowBounds Bounds to limit object retrieval* @return Cursor of mapped objects*/<T> Cursor<T> selectCursor(String statement, Object parameter, RowBounds rowBounds);/*** Retrieve a single row mapped from the statement key and parameter* using a {@code ResultHandler}.* @param statement Unique identifier matching the statement to use.* @param parameter A parameter object to pass to the statement.* @param handler ResultHandler that will handle each retrieved row*/void select(String statement, Object parameter, ResultHandler handler);/*** Retrieve a single row mapped from the statement* using a {@code ResultHandler}.* @param statement Unique identifier matching the statement to use.* @param handler ResultHandler that will handle each retrieved row*/void select(String statement, ResultHandler handler);/*** Retrieve a single row mapped from the statement key and parameter* using a {@code ResultHandler} and {@code RowBounds}* @param statement Unique identifier matching the statement to use.* @param rowBounds RowBound instance to limit the query results* @param handler ResultHandler that will handle each retrieved row*/void select(String statement, Object parameter, RowBounds rowBounds, ResultHandler handler);/*** Execute an insert statement.* @param statement Unique identifier matching the statement to execute.* @return int The number of rows affected by the insert.*/int insert(String statement);/*** Execute an insert statement with the given parameter object. Any generated* autoincrement values or selectKey entries will modify the given parameter* object properties. Only the number of rows affected will be returned.* @param statement Unique identifier matching the statement to execute.* @param parameter A parameter object to pass to the statement.* @return int The number of rows affected by the insert.*/int insert(String statement, Object parameter);/*** Execute an update statement. The number of rows affected will be returned.* @param statement Unique identifier matching the statement to execute.* @return int The number of rows affected by the update.*/int update(String statement);/*** Execute an update statement. The number of rows affected will be returned.* @param statement Unique identifier matching the statement to execute.* @param parameter A parameter object to pass to the statement.* @return int The number of rows affected by the update.*/int update(String statement, Object parameter);/*** Execute a delete statement. The number of rows affected will be returned.* @param statement Unique identifier matching the statement to execute.* @return int The number of rows affected by the delete.*/int delete(String statement);/*** Execute a delete statement. The number of rows affected will be returned.* @param statement Unique identifier matching the statement to execute.* @param parameter A parameter object to pass to the statement.* @return int The number of rows affected by the delete.*/int delete(String statement, Object parameter);/*** Flushes batch statements and commits database connection.* Note that database connection will not be committed if no updates/deletes/inserts were called.* To force the commit call {@link SqlSession#commit(boolean)}*/void commit();/*** Flushes batch statements and commits database connection.* @param force forces connection commit*/void commit(boolean force);/*** Discards pending batch statements and rolls database connection back.* Note that database connection will not be rolled back if no updates/deletes/inserts were called.* To force the rollback call {@link SqlSession#rollback(boolean)}*/void rollback();/*** Discards pending batch statements and rolls database connection back.* Note that database connection will not be rolled back if no updates/deletes/inserts were called.* @param force forces connection rollback*/void rollback(boolean force);/*** Flushes batch statements.* @return BatchResult list of updated records* @since 3.0.6*/List<BatchResult> flushStatements();/*** Closes the session*/@Overridevoid close();/*** Clears local session cache*/void clearCache();/*** Retrieves current configuration* @return Configuration*/Configuration getConfiguration();/*** Retrieves a mapper.* @param <T> the mapper type* @param type Mapper interface class* @return a mapper bound to this SqlSession*/<T> T getMapper(Class<T> type);/*** Retrieves inner database connection* @return Connection*/Connection getConnection();
}
以下两个都是接口，而且应该是采用了抽象工厂的设计模式，有兴趣的可以了解一下
上面的都是mybatis的源码，也只是贴出来一下
mybatis为了方便我们创建工厂对象，还提供了一个
SqlSessionFactoryBuilder对象用于给我们方便创建对象，以及提供了Resources对象方便加载流数据
这一章主要就是说了一下核心的接口，当然了还有很多其他的，只不过照顺序看下来目前就这几个比较重要，下一章准备说下SqlSessionFactoryBuilder的parse方法，也是比较核心的方法，会分为几帐来说，一点一点记录
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