mybatis数据输入-实体类型的参数

1、建库建表

CREATE DATABASE `mybatis-example`;
 
USE `mybatis-example`;
 
CREATE TABLE `t_emp`(
  emp_id INT AUTO_INCREMENT,
  emp_name CHAR(100),
  emp_salary DOUBLE(10,5),
  PRIMARY KEY(emp_id)
);
 
INSERT INTO `t_emp`(emp_name,emp_salary) VALUES("tom",200.33);
INSERT INTO `t_emp`(emp_name,emp_salary) VALUES("jerry",666.66);
INSERT INTO `t_emp`(emp_name,emp_salary) VALUES("andy",777.77);

2、pom.xml

    
        
            org.mybatis
            mybatis
        
 
        
        
            mysql
            mysql-connector-java
        
 
        
        
            org.junit.jupiter
            junit-jupiter-api
        
 
        
            org.projectlombok
            lombok
        
    

3、Employee.java（pojo）

package com.atguigu.mybatis.pojo;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
@Data
@NoArgsConstructor
@AllArgsConstructor
public class Employee {
    private Integer empId;
    private String empName;
    private Double empSalary;
}

4、EmpMapper.java

package com.atguigu.mybatis.mapper;
import com.atguigu.mybatis.pojo.Employee;
public interface EmpMapper {

    void addEmp(Employee employee);

}

5、mybatis-config.xml（mybatis的总配置文件）

6、EmpMapper.xml

    

    
    
    
        
        insert into t_emp values(0,#{empName},#{empSalary})
        
    

7、MybatisTest3.java

package com.atguigu.mybatis;
import com.atguigu.mybatis.mapper.EmpMapper;
import com.atguigu.mybatis.pojo.Employee;
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.junit.jupiter.api.AfterEach;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import java.io.IOException;
import java.io.InputStream;
public class MybatisTest3 {
    SqlSessionFactory sqlSessionFactory;
    SqlSession sqlSession;
    EmpMapper empMapper;

    @BeforeEach
    public void setup() throws IOException {
        // 获取资源流，读取"mybatis-config.xml"文件
        InputStream inputStream = Resources.getResourceAsStream("mybatis-config.xml");
        // 使用资源流创建SqlSessionFactory
        sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
        // 使用SqlSessionFactory打开一个Session
        sqlSession = sqlSessionFactory.openSession();
        // 使用Session获取EmpMapper的Mapper对象
        empMapper = sqlSession.getMapper(EmpMapper.class);
    }

    // 在每个测试用例之后执行的清理方法
    @AfterEach
    public void teardown() {
        sqlSession.commit();  // 提交事务
        sqlSession.close();  // 关闭SqlSession
    }
    
    @Test
    public void addEmpTest() {
        Employee employee = new Employee(0, "鸠摩智", 8080.0);
        empMapper.addEmp(employee);
    }
}

8、logback

D:\Java\jdk-17\bin\java.exe -ea -Didea.test.cyclic.buffer.size=1048576 "-javaagent:D:\BaiduNetdiskDownload\IntelliJ IDEA 2023.2\lib\idea_rt.jar=54009:D:\BaiduNetdiskDownload\IntelliJ IDEA 2023.2\bin" -Dfile.encoding=UTF-8 -classpath "D:\develop\maven\repository\org\junit\platform\junit-platform-launcher\1.3.1\junit-platform-launcher-1.3.1.jar;D:\develop\maven\repository\org\apiguardian\apiguardian-api\1.0.0\apiguardian-api-1.0.0.jar;D:\develop\maven\repository\org\junit\platform\junit-platform-engine\1.3.1\junit-platform-engine-1.3.1.jar;D:\develop\maven\repository\org\junit\platform\junit-platform-commons\1.3.1\junit-platform-commons-1.3.1.jar;D:\develop\maven\repository\org\opentest4j\opentest4j\1.1.1\opentest4j-1.1.1.jar;D:\develop\maven\repository\org\junit\jupiter\junit-jupiter-engine\5.3.1\junit-jupiter-engine-5.3.1.jar;D:\develop\maven\repository\org\junit\jupiter\junit-jupiter-api\5.3.1\junit-jupiter-api-5.3.1.jar;D:\BaiduNetdiskDownload\IntelliJ IDEA 2023.2\lib\idea_rt.jar;D:\BaiduNetdiskDownload\IntelliJ IDEA 2023.2\plugins\junit\lib\junit5-rt.jar;D:\BaiduNetdiskDownload\IntelliJ IDEA 2023.2\plugins\junit\lib\junit-rt.jar;F:\IdeaProjects\workspace\pro-ssm\pro18-mybatis-begin\target\test-classes;F:\IdeaProjects\workspace\pro-ssm\pro18-mybatis-begin\target\classes;F:\my_java\maven_repository\org\mybatis\mybatis\3.5.11\mybatis-3.5.11.jar;F:\my_java\maven_repository\mysql\mysql-connector-java\8.0.25\mysql-connector-java-8.0.25.jar;F:\my_java\maven_repository\com\google\protobuf\protobuf-java\3.11.4\protobuf-java-3.11.4.jar;F:\my_java\maven_repository\org\junit\jupiter\junit-jupiter-api\5.3.1\junit-jupiter-api-5.3.1.jar;F:\my_java\maven_repository\org\apiguardian\apiguardian-api\1.0.0\apiguardian-api-1.0.0.jar;F:\my_java\maven_repository\org\opentest4j\opentest4j\1.1.1\opentest4j-1.1.1.jar;F:\my_java\maven_repository\org\junit\platform\junit-platform-commons\1.3.1\junit-platform-commons-1.3.1.jar;F:\my_java\maven_repository\org\projectlombok\lombok\1.18.20\lombok-1.18.20.jar;F:\my_java\maven_repository\ch\qos\logback\logback-classic\1.2.3\logback-classic-1.2.3.jar;F:\my_java\maven_repository\ch\qos\logback\logback-core\1.2.3\logback-core-1.2.3.jar;F:\my_java\maven_repository\org\slf4j\slf4j-api\1.7.25\slf4j-api-1.7.25.jar" com.intellij.rt.junit.JUnitStarter -ideVersion5 -junit5 com.atguigu.mybatis.MybatisTest3,addEmpTest
09:51:08,942 |-INFO in ch.qos.logback.classic.LoggerContext[default] - Could NOT find resource [logback-test.xml]
09:51:08,943 |-INFO in ch.qos.logback.classic.LoggerContext[default] - Could NOT find resource [logback.groovy]
09:51:08,943 |-INFO in ch.qos.logback.classic.LoggerContext[default] - Found resource [logback.xml] at [file:/F:/IdeaProjects/workspace/pro-ssm/pro18-mybatis-begin/target/classes/logback.xml]
09:51:09,020 |-INFO in ch.qos.logback.core.joran.action.AppenderAction - About to instantiate appender of type [ch.qos.logback.core.ConsoleAppender]
09:51:09,023 |-INFO in ch.qos.logback.core.joran.action.AppenderAction - Naming appender as [STDOUT]
09:51:09,029 |-INFO in ch.qos.logback.core.joran.action.NestedComplexPropertyIA - Assuming default type [ch.qos.logback.classic.encoder.PatternLayoutEncoder] for [encoder] property
09:51:09,058 |-INFO in ch.qos.logback.classic.joran.action.RootLoggerAction - Setting level of ROOT logger to DEBUG
09:51:09,058 |-INFO in ch.qos.logback.core.joran.action.AppenderRefAction - Attaching appender named [STDOUT] to Logger[ROOT]
09:51:09,060 |-INFO in ch.qos.logback.classic.joran.action.LoggerAction - Setting level of logger [com.atguigu.mybatis] to DEBUG
09:51:09,060 |-INFO in ch.qos.logback.classic.joran.action.ConfigurationAction - End of configuration.
09:51:09,061 |-INFO in ch.qos.logback.classic.joran.JoranConfigurator@3d1cfad4 - Registering current configuration as safe fallback point
[09:51:09.067] [DEBUG] [main] [org.apache.ibatis.logging.LogFactory] [Logging initialized using 'class org.apache.ibatis.logging.slf4j.Slf4jImpl' adapter.]
[09:51:09.085] [DEBUG] [main] [org.apache.ibatis.datasource.pooled.PooledDataSource] [PooledDataSource forcefully closed/removed all connections.]
[09:51:09.085] [DEBUG] [main] [org.apache.ibatis.datasource.pooled.PooledDataSource] [PooledDataSource forcefully closed/removed all connections.]
[09:51:09.085] [DEBUG] [main] [org.apache.ibatis.datasource.pooled.PooledDataSource] [PooledDataSource forcefully closed/removed all connections.]
[09:51:09.085] [DEBUG] [main] [org.apache.ibatis.datasource.pooled.PooledDataSource] [PooledDataSource forcefully closed/removed all connections.]
[09:51:09.168] [DEBUG] [main] [org.apache.ibatis.transaction.jdbc.JdbcTransaction] [Opening JDBC Connection]
[09:51:09.674] [DEBUG] [main] [org.apache.ibatis.datasource.pooled.PooledDataSource] [Created connection 494953170.]
[09:51:09.675] [DEBUG] [main] [org.apache.ibatis.transaction.jdbc.JdbcTransaction] [Setting autocommit to false on JDBC Connection [com.mysql.cj.jdbc.ConnectionImpl@1d8062d2]]
[09:51:09.679] [DEBUG] [main] [com.atguigu.mybatis.mapper.EmpMapper.addEmp] [==>  Preparing: insert into t_emp values(0,?,?)]
[09:51:09.723] [DEBUG] [main] [com.atguigu.mybatis.mapper.EmpMapper.addEmp] [==> Parameters: 鸠摩智(String), 8080.0(Double)]
[09:51:09.726] [DEBUG] [main] [com.atguigu.mybatis.mapper.EmpMapper.addEmp] [<==    Updates: 1]
[09:51:09.730] [DEBUG] [main] [org.apache.ibatis.transaction.jdbc.JdbcTransaction] [Committing JDBC Connection [com.mysql.cj.jdbc.ConnectionImpl@1d8062d2]]
[09:51:09.733] [DEBUG] [main] [org.apache.ibatis.transaction.jdbc.JdbcTransaction] [Resetting autocommit to true on JDBC Connection [com.mysql.cj.jdbc.ConnectionImpl@1d8062d2]]
[09:51:09.736] [DEBUG] [main] [org.apache.ibatis.transaction.jdbc.JdbcTransaction] [Closing JDBC Connection [com.mysql.cj.jdbc.ConnectionImpl@1d8062d2]]
[09:51:09.736] [DEBUG] [main] [org.apache.ibatis.datasource.pooled.PooledDataSource] [Returned connection 494953170 to pool.]

Process finished with exit code 0

 9、

   在MyBatis的配置文件中， 元素用于指定使用JDBC事务管理器来管理数据库事务。

  JDBC事务管理器通过JDBC连接进行事务管理，它支持普通的数据库连接事务。当使用JDBC事务管理器时，MyBatis将使用JDBC的提交和回滚来控制事务的提交和回滚。

   在MyBatis的配置文件中，使用元素可以指定使用不同的事务管理器。除了JDBC事务管理器，MyBatis还支持其他的的事务管理器，例如Spring事务管理器。

   使用元素告诉MyBatis在事务管理方面使用JDBC事务管理器，而不是其他的事务管理器。这对于与数据库交互的Java应用程序非常有用，因为它们通常使用JDBC连接来执行数据库操作。

    在 MyBatis 中， 用于指定事务管理器的类型是 JDBC，也就是采用 JDBC 的方式来管理事务。

    JDBC 事务管理器是 MyBatis 默认的事务管理器类型，它会在每个 SQL 会话中使用 JDBC 的自动提交（auto-commit）特性来实现事务的提交和回滚。也就是说，当一个 SQL 语句执行成功时，它会自动提交事务，如果执行失败，则会自动回滚事务。

    需要注意的是，如果我们想要对事务进行更加细粒度的控制，比如手动提交或回滚事务，那么就需要使用其他类型的事务管理器，比如 JTA 或 Spring 管理的事务管理器。