MyBatis學習總結（五）---MyBatis中日誌的使用及使用log4j示例

Mybatis 的內置日誌工廠提供日誌功能，內置日誌工廠將日誌交給以下其中一種工具作代理：

SLF4J
Apache Commons Logging
Log4j 2
Log4j
JDK logging

MyBatis 內置日誌工廠基於運行時自省機制選擇合適的日誌工具。它會使用第一個查找得到的工具（按上文列舉的順序查找）。如果一個都未找到，日誌功能就會被禁用。

不少應用服務器（如 Tomcat 和 WebShpere）的類路徑中已經包含 Commons Logging，所以在這種配置環境下的 MyBatis 會把它作爲日誌工具，記住這點非常重要。這將意味着，在諸如 WebSphere 的環境中，它提供了 Commons Logging 的私有實現，你的 Log4J 配置將被忽略。MyBatis 將你的 Log4J 配置忽略掉是相當令人鬱悶的（事實上，正是因爲在這種配置環境下，MyBatis 纔會選擇使用 Commons Logging 而不是 Log4J）。如果你的應用部署在一個類路徑已經包含 Commons Logging 的環境中，而你又想使用其它日誌工具，你可以通過在 MyBatis 配置文件 mybatis-config.xml 裏面添加一項 setting 來選擇別的日誌工具。

<configuration>
  <settings>
    ...
    <setting name="logImpl" value="LOG4J"/>
    ...
  </settings>
</configuration>

logImpl 可選的值有：SLF4J、LOG4J、LOG4J2、JDK_LOGGING、COMMONS_LOGGING、STDOUT_LOGGING、NO_LOGGING，或者是實現了接口 org.apache.ibatis.logging.Log 的，且構造方法是以字符串爲參數的類的完全限定名。（譯者注：可以參考org.apache.ibatis.logging.slf4j.Slf4jImpl.java的實現）

你也可以調用如下任一方法來使用日誌工具：

org.apache.ibatis.logging.LogFactory.useSlf4jLogging();
org.apache.ibatis.logging.LogFactory.useLog4JLogging();
org.apache.ibatis.logging.LogFactory.useJdkLogging();
org.apache.ibatis.logging.LogFactory.useCommonsLogging();
org.apache.ibatis.logging.LogFactory.useStdOutLogging();

如果你決定要調用以上某個方法，請在調用其它 MyBatis 方法之前調用它。另外，僅當運行時類路徑中存在該日誌工具時，調用與該日誌工具對應的方法纔會生效，否則 MyBatis 一概忽略。如你環境中並不存在 Log4J，你卻調用了相應的方法，MyBatis 就會忽略這一調用，轉而以默認的查找順序查找日誌工具。

輸出日誌方法一：使用標準的日誌輸出

這種方法只需要在MyBatis的配置文件中加入一個設置即可，而不需要導入log4j包，也不需要對log4j進行配置

  <settings>
		<setting name="logImpl" value="STDOUT_LOGGING" />
	</settings>

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>

	<!-- 引用並使用db.properties -->
	<properties resource="db.properties" />
	
	<settings>
		<setting name="logImpl" value="STDOUT_LOGGING" />
	</settings>
	
	<!-- environments：信息配置的是連接數據庫的（數據源的）一些參數，如用戶名，密碼等，MyBatis數據庫操作的session就是根據這些信息初始化的 -->
	<environments default="development">
		<environment id="development">
			<transactionManager type="JDBC" />
			<!-- 數據源配置 -->
			<dataSource type="POOLED">
				<!-- 數據庫驅動 -->
				<property name="driver" value="${driver}" />
				<!-- 數據庫連接URL -->
				<property name="url" value="${url}" />
				<!-- 數據庫用戶名和密碼 -->
				<property name="username" value="${username}" />
				<property name="password" value="${password}" />
			</dataSource>
		</environment>
	</environments>



	<!-- mappers:配置的是一個個Mapper文件，這些文件來約束數據庫的信息（Relationship) 和 對象（Object)的信息映射（Mapper);它負責完成對象和數據庫表的映射，是ORM最具體的配置 -->
	<mappers>
		<!-- 配置實體映射文件 -->
		<mapper resource="com/mybatisstudy/dao/userMapper.xml" />
	</mappers>


</configuration>

使用這種方式控制檯的輸出示例：

Logging initialized using 'class org.apache.ibatis.logging.stdout.StdOutImpl' adapter.
PooledDataSource forcefully closed/removed all connections.
PooledDataSource forcefully closed/removed all connections.
PooledDataSource forcefully closed/removed all connections.
PooledDataSource forcefully closed/removed all connections.
Opening JDBC Connection
Created connection 76432244.
Setting autocommit to false on JDBC Connection [com.mysql.jdbc.JDBC4Connection@48e4374]
==>  Preparing: INSERT INTO user(id,name,sex,age) VALUES(?,?,?,?); 
==> Parameters: 1003(Integer), 小杰(String), 男(String), 20(Integer)
<==    Updates: 1
==>  Preparing: UPDATE user SET age=? ,name=? WHERE id=? 
==> Parameters: 21(Integer), 小明(String), 1003(Integer)
<==    Updates: 1
==>  Preparing: SELECT * FROM user where id = ? ; 
==> Parameters: 1001(Integer)
<==    Columns: id, name, sex, age
<==        Row: 1001, 小明, 男, 21
<==      Total: 1
[id:1001,name:小明,sex:男,age:21]
==>  Preparing: DELETE FROM user WHERE id=?; 
==> Parameters: 1003(Integer)
<==    Updates: 1
==>  Preparing: SELECT * FROM user ; 
==> Parameters: 
<==    Columns: id, name, sex, age
<==        Row: 1001, 小明, 男, 21
<==        Row: 1002, 小華, 男, 18
<==      Total: 2
[[id:1001,name:小明,sex:男,age:21], [id:1002,name:小華,sex:男,age:18]]
Rolling back JDBC Connection [com.mysql.jdbc.JDBC4Connection@48e4374]
Resetting autocommit to true on JDBC Connection [com.mysql.jdbc.JDBC4Connection@48e4374]
Closing JDBC Connection [com.mysql.jdbc.JDBC4Connection@48e4374]
Returned connection 76432244 to pool.

輸出日誌方法二：使用log4j日誌輸出

1.導入log4j包，如：log4j-1.2.17.jar

2.在MyBatis的配置文件中配置：

<settings>
		<setting name="logImpl" value="LOG4J" />
	</settings>

3.根據自己的需要配置log4j配置文件中的內容（如配置輸出端(Appenders)和日誌格式化器(Layout)等）

示例（輸出到控制檯和文件中）：

log4j.rootLogger=DEBUG,CONSOLE,FILE
#DEBUG,CONSOLE,FILE,ROLLING_FILE,MAIL,DATABASE,LF5_APPENDER

log4j.addivity.org.apache=true
 

# Console Appender
log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
log4j.appender.Threshold=DEBUG
log4j.appender.CONSOLE.Target=System.out
log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout
log4j.appender.CONSOLE.layout.ConversionPattern=%d [%t] %-5p [%c] - %m%n


# File Appender
log4j.appender.FILE=org.apache.log4j.FileAppender
#此處是用絕對路徑
#也可以用相對路徑，如在一個listener中獲取項目運行的真正路徑apppath，然後如：${apppath}/MyBatis.log
log4j.appender.FILE.File=D:/MyBatis.log
log4j.appender.FILE.Append=false
log4j.appender.FILE.layout=org.apache.log4j.PatternLayout
log4j.appender.FILE.layout.ConversionPattern=%d [%t] %-5p [%c] - %m%n
# Use this layout for LogFactor 5 analysis

控制檯的輸出結果：

2018-11-23 11:10:09,634 [main] DEBUG [org.apache.ibatis.logging.LogFactory] - Logging initialized using 'class org.apache.ibatis.logging.log4j.Log4jImpl' adapter.
2018-11-23 11:10:09,755 [main] DEBUG [org.apache.ibatis.logging.LogFactory] - Logging initialized using 'class org.apache.ibatis.logging.log4j.Log4jImpl' adapter.
2018-11-23 11:10:09,780 [main] DEBUG [org.apache.ibatis.datasource.pooled.PooledDataSource] - PooledDataSource forcefully closed/removed all connections.
2018-11-23 11:10:09,780 [main] DEBUG [org.apache.ibatis.datasource.pooled.PooledDataSource] - PooledDataSource forcefully closed/removed all connections.
2018-11-23 11:10:09,781 [main] DEBUG [org.apache.ibatis.datasource.pooled.PooledDataSource] - PooledDataSource forcefully closed/removed all connections.
2018-11-23 11:10:09,781 [main] DEBUG [org.apache.ibatis.datasource.pooled.PooledDataSource] - PooledDataSource forcefully closed/removed all connections.
2018-11-23 11:10:09,950 [main] DEBUG [org.apache.ibatis.transaction.jdbc.JdbcTransaction] - Opening JDBC Connection
2018-11-23 11:10:10,383 [main] DEBUG [org.apache.ibatis.datasource.pooled.PooledDataSource] - Created connection 835227336.
2018-11-23 11:10:10,384 [main] DEBUG [org.apache.ibatis.transaction.jdbc.JdbcTransaction] - Setting autocommit to false on JDBC Connection [com.mysql.jdbc.JDBC4Connection@31c88ec8]
2018-11-23 11:10:10,390 [main] DEBUG [com.mybatisstudy.dao.IUserDao.addUser] - ==>  Preparing: INSERT INTO user(id,name,sex,age) VALUES(?,?,?,?); 
2018-11-23 11:10:10,479 [main] DEBUG [com.mybatisstudy.dao.IUserDao.addUser] - ==> Parameters: 1003(Integer), 小杰(String), 男(String), 20(Integer)
2018-11-23 11:10:10,520 [main] DEBUG [com.mybatisstudy.dao.IUserDao.addUser] - <==    Updates: 1
2018-11-23 11:10:10,531 [main] DEBUG [com.mybatisstudy.dao.IUserDao.updateUser] - ==>  Preparing: UPDATE user SET age=? ,name=? WHERE id=? 
2018-11-23 11:10:10,532 [main] DEBUG [com.mybatisstudy.dao.IUserDao.updateUser] - ==> Parameters: 21(Integer), 小明(String), 1003(Integer)
2018-11-23 11:10:10,538 [main] DEBUG [com.mybatisstudy.dao.IUserDao.updateUser] - <==    Updates: 1
2018-11-23 11:10:10,544 [main] DEBUG [com.mybatisstudy.dao.IUserDao.selectUserById] - ==>  Preparing: SELECT * FROM user where id = ? ; 
2018-11-23 11:10:10,545 [main] DEBUG [com.mybatisstudy.dao.IUserDao.selectUserById] - ==> Parameters: 1001(Integer)
2018-11-23 11:10:10,576 [main] DEBUG [com.mybatisstudy.dao.IUserDao.selectUserById] - <==      Total: 1
[id:1001,name:小明,sex:男,age:21]
2018-11-23 11:10:10,579 [main] DEBUG [com.mybatisstudy.dao.IUserDao.deleteUserById] - ==>  Preparing: DELETE FROM user WHERE id=?; 
2018-11-23 11:10:10,580 [main] DEBUG [com.mybatisstudy.dao.IUserDao.deleteUserById] - ==> Parameters: 1003(Integer)
2018-11-23 11:10:10,581 [main] DEBUG [com.mybatisstudy.dao.IUserDao.deleteUserById] - <==    Updates: 1
2018-11-23 11:10:10,583 [main] DEBUG [com.mybatisstudy.dao.IUserDao.selectAllUser] - ==>  Preparing: SELECT * FROM user ; 
2018-11-23 11:10:10,584 [main] DEBUG [com.mybatisstudy.dao.IUserDao.selectAllUser] - ==> Parameters: 
2018-11-23 11:10:10,585 [main] DEBUG [com.mybatisstudy.dao.IUserDao.selectAllUser] - <==      Total: 2
[[id:1001,name:小明,sex:男,age:21], [id:1002,name:小華,sex:男,age:18]]
2018-11-23 11:10:10,587 [main] DEBUG [org.apache.ibatis.transaction.jdbc.JdbcTransaction] - Rolling back JDBC Connection [com.mysql.jdbc.JDBC4Connection@31c88ec8]
2018-11-23 11:10:10,828 [main] DEBUG [org.apache.ibatis.transaction.jdbc.JdbcTransaction] - Resetting autocommit to true on JDBC Connection [com.mysql.jdbc.JDBC4Connection@31c88ec8]
2018-11-23 11:10:10,828 [main] DEBUG [org.apache.ibatis.transaction.jdbc.JdbcTransaction] - Closing JDBC Connection [com.mysql.jdbc.JDBC4Connection@31c88ec8]
2018-11-23 11:10:10,829 [main] DEBUG [org.apache.ibatis.datasource.pooled.PooledDataSource] - Returned connection 835227336 to pool.

日誌文件中的內容：

MyBatis學習總結（五）---MyBatis中日誌的使用及使用log4j示例

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