MyBatis打印輸出SQL語句

Hibernate是可以配置 show_sql 顯示 自動生成的SQL 語句，用 format_sql 可以格式化SQL 語句，但如果用 mybatis 怎麼實現這個功能呢？如果你搜索看一下，基本都是通過配置日誌來實現的，比如配置我們最常用的 log4j.properties 來實現。

首頁我們創建一個 java 工程叫作：mybatis12，內容與之前 Mybatis+Spring 差不多，實現一個通過指定用戶ID並讀取其訂單列表，來觀察SQL的執行情況。其工程目錄結構如下：

log4j.properties 內容如下：

# by yiibai.com
log4j.rootLogger=debug,stdout,logfile
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
#log4j.appender.stdout.Target=System.err
log4j.appender.stdout.layout=org.apache.log4j.SimpleLayout
log4j.appender.logfile=org.apache.log4j.FileAppender
log4j.appender.logfile.File=C:/mybatis_show_sql.log
log4j.appender.logfile.layout=org.apache.log4j.PatternLayout
log4j.appender.logfile.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %F %p %m%n

log4j.logger.com.ibatis=DEBUG
log4j.logger.com.ibatis.common.jdbc.SimpleDataSource=DEBUG
log4j.logger.com.ibatis.common.jdbc.ScriptRunner=DEBUG
log4j.logger.com.ibatis.sqlmap.engine.impl.SqlMapClientDelegate=DEBUG
log4j.logger.java.sql.Connection=DEBUG
log4j.logger.java.sql.Statement=DEBUG
log4j.logger.java.sql.PreparedStatement=DEBUG

主類測試代碼如下：

import java.io.Reader;
import java.text.MessageFormat;
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 com.yiibai.dao.IUser;
import com.yiibai.pojo.User;

public class Main {
private static SqlSessionFactory sqlSessionFactory;
private static Reader reader;

static {
    try {
        reader = Resources.getResourceAsReader("config/Configure.xml");
        sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader);
    } catch (Exception e) {
        e.printStackTrace();
    }
}

public static SqlSessionFactory getSession() {
    return sqlSessionFactory;
}

/\*\*
 \* @param args
 \*/
public static void main(String\[\] args) {
    // TODO Auto-generated method stub
    SqlSession session = sqlSessionFactory.openSession();
    try {
        //User user = (User) session.selectOne(
        //        "com.yiibai.mybatis.models.UserMapper.getUserByID", 1);
        IUser iuser = session.getMapper(IUser.class);
        getUserList();
        //testInsert();
        testUpdate();
        //testDelete();

    } finally {
        session.close();
    }
}
// 
public static void testInsert()
{
    try
    {
        SqlSession session = sqlSessionFactory.openSession();
        IUser userMapper = session.getMapper(IUser.class);
        System.out.println("Test insert start...");
        User user = new User();
        user.setId(0);
        user.setName("Google");
        user.setDept("Tech");
        user.setWebsite("http://www.google.com");
        user.setPhone("120");
        userMapper.insertUser(user);
        session.commit();

        System.out.println("\\r\\nAfter insert");
        getUserList();
        System.out.println("Test insert finished...");
    }
    catch (Exception e)
    {
        e.printStackTrace();
    }
}

// 用戶列表
public static void getUserList(){
    try
    {
        SqlSession session = sqlSessionFactory.openSession();
        IUser iuser = session.getMapper(IUser.class);
        System.out.println("Test Get start...");
        printUsers(iuser.getUserList());
        System.out.println("Test Get finished...");
    }catch (Exception e)
    {
        e.printStackTrace();
    }
}
public static void testUpdate()
{
    try
    {
        SqlSession session = sqlSessionFactory.openSession();
        IUser iuser = session.getMapper(IUser.class);
        System.out.println("Test update start...");
        printUsers(iuser.getUserList());
        User user = iuser.getUser(1);
        user.setName("New name");
        iuser.updateUser(user);
        session.commit();
        System.out.println("\\r\\nAfter update");
        printUsers(iuser.getUserList());
        System.out.println("Test update finished...");
    }catch (Exception e)
    {
        e.printStackTrace();
    }
}

public static void testDelete()
{
    try
    {
        SqlSession session = sqlSessionFactory.openSession();
        IUser iuser = session.getMapper(IUser.class);
        System.out.println("Test delete start...");
        System.out.println("Before delete");
        printUsers(iuser.getUserList());
        iuser.deleteUser(3);
        session.commit();
        System.out.println("\\r\\nAfter delete");
        printUsers(iuser.getUserList());
        System.out.println("Test delete finished...");
    }catch (Exception e)
    {
        e.printStackTrace();
    }
}
/\*\*
 \* 
 \* 
 \* @param users
 \*/
private static void printUsers(final List<User> users)
{
    int count = 0;

    for (User user : users)
    {
        System.out.println(MessageFormat.format("============= User\[{0}\]=================", ++count));
        System.out.println("User Id: " + user.getId());
        System.out.println("User Name: " + user.getName());
        System.out.println("User Dept: " + user.getDept());
        System.out.println("User Website: " + user.getWebsite());
    }
}

}

執行後，在MyEclise終端輸出結果如下：

DEBUG - Logging initialized using 'class org.apache.ibatis.logging.commons.JakartaCommonsLoggingImpl' adapter.
DEBUG - PooledDataSource forcefully closed/removed all connections.
DEBUG - PooledDataSource forcefully closed/removed all connections.
DEBUG - PooledDataSource forcefully closed/removed all connections.
DEBUG - PooledDataSource forcefully closed/removed all connections.
Test Get start...
DEBUG - Opening JDBC Connection
DEBUG - Created connection 22927632.
DEBUG - Setting autocommit to false on JDBC Connection [com.mysql.jdbc.JDBC4Connection@15dd910]
DEBUG - ooo Using Connection [com.mysql.jdbc.JDBC4Connection@15dd910]
DEBUG - ==> Preparing: select * from user
DEBUG - ==> Parameters:
DEBUG - <== Total: 2
============= User[1]=================
User Id: 1
User Name: New name
User Dept: Tech
User Website: http://www.yiibai.com
============= User[2]=================
User Id: 2
User Name: Hevi
User Dept: Tech
User Website: http://www.baidu.com
Test Get finished...
Test update start...
DEBUG - Opening JDBC Connection
DEBUG - Created connection 33189144.
DEBUG - Setting autocommit to false on JDBC Connection [com.mysql.jdbc.JDBC4Connection@1fa6d18]
DEBUG - ooo Using Connection [com.mysql.jdbc.JDBC4Connection@1fa6d18]
DEBUG - ==> Preparing: select * from user
DEBUG - ==> Parameters:
DEBUG - <== Total: 2
============= User[1]=================
User Id: 1
User Name: New name
User Dept: Tech
User Website: http://www.yiibai.com
============= User[2]=================
User Id: 2
User Name: Hevi
User Dept: Tech
User Website: http://www.baidu.com
DEBUG - ooo Using Connection [com.mysql.jdbc.JDBC4Connection@1fa6d18]
DEBUG - ==> Preparing: select * from user where id=?
DEBUG - ==> Parameters: 1(Integer)
DEBUG - <== Total: 1
DEBUG - ooo Using Connection [com.mysql.jdbc.JDBC4Connection@1fa6d18]
DEBUG - ==> Preparing: UPDATE user SET name = ?, dept = ?, website = ?, phone = ? where id = ?
DEBUG - ==> Parameters: New name(String), Tech(String), http://www.yiibai.com(String), 13800009988(String), 1(Integer)
DEBUG - <== Updates: 1
DEBUG - Committing JDBC Connection [com.mysql.jdbc.JDBC4Connection@1fa6d18]

After update
DEBUG - ooo Using Connection [com.mysql.jdbc.JDBC4Connection@1fa6d18]
DEBUG - ==> Preparing: select * from user
DEBUG - ==> Parameters:
DEBUG - <== Total: 2
============= User[1]=================
User Id: 1
User Name: New name
User Dept: Tech
User Website: http://www.yiibai.com
============= User[2]=================
User Id: 2
User Name: Hevi
User Dept: Tech
User Website: http://www.baidu.com
Test update finished...

代碼下載： http://pan.baidu.com/s/1jGk165o

Jar 包下載：http://pan.baidu.com/s/1bnyRJ9H