這幾天，經同事介紹想學習一下Nutz，至於有什麼好處加爲什麼學，自已百度！
按照nutz手冊 下載了nutz工程源碼，一步一步配置，有幾個地方需要注意一下！
2. 創建連接配置文件
在 Eclipse 項目裏，增加一個新的 source folder (這個很重要)：右擊項目 > New > Source Folder
a.隨便給這個 Folder 起個名字，比如 properties
b.然後在裏面創建一個文本文件 nutz-test.properties
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
at org.nutz.Nutzs.loadProperties(Nutzs.java:41)
at org.nutz.Nutzs.checkProperties(Nutzs.java:32)
at org.nutz.dao.test.DaoCase.setUp(DaoCase.java:20)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
PreparedStatement:
'INSERT INTO t_goods(name,thumb) VALUES(?,?) '
CaseMessage=Packet for query is too large (3695 > 2048). You can change this value on the server by setting the max_allowed_packet' variable.
at org.nutz.dao.impl.sql.run.NutDaoExecutor.exec(NutDaoExecutor.java:102)
at org.nutz.dao.DaoInterceptorChain.doChain(DaoInterceptorChain.java:66)
at org.nutz.dao.impl.interceptor.SayHiDaoInterceptor.filter(SayHiDaoInterceptor.java:16)
at org.nutz.dao.DaoInterceptorChain.doChain(DaoInterceptorChain.java:64)
at org.nutz.dao.impl.interceptor.DaoTimeInterceptor.filter(DaoTimeInterceptor.java:23)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Caused by: com.mysql.jdbc.PacketTooBigException: Packet for query is too large (3695 > 2048). You can change this value on the server by setting the max_allowed_packet' variable.
at com.mysql.jdbc.MysqlIO.send(MysqlIO.java:3675)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2506)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2677)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2549)
at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1861)
at com.mysql.jdbc.PreparedStatement.execute(PreparedStatement.java:1192)
at com.alibaba.druid.pool.DruidPooledPreparedStatement.execute(DruidPooledPreparedStatement.java:493)
at org.nutz.dao.impl.sql.run.NutDaoExecutor._runPreparedStatement(NutDaoExecutor.java:308)
at org.nutz.dao.impl.sql.run.NutDaoExecutor.exec(NutDaoExecutor.java:90)
... 74 more
上面已經提示解決方法了，設置max_allowed_packet屬性，主要有兩種方法：
org.nutz.dao.DaoException: !Nutz SQL Error: 'CREATE TABLE dao_country(
id INT(32) AUTO_INCREMENT,
name VARCHAR(128) UNIQUE NOT NULL,
detail VARCHAR(128),
PRIMARY KEY (id)
) ENGINE=InnoDB CHARSET=utf8'
PreparedStatement:
'CREATE TABLE dao_country(
id INT(32) AUTO_INCREMENT,
name VARCHAR(128) UNIQUE NOT NULL,
detail VARCHAR(128),
PRIMARY KEY (id)
) ENGINE=InnoDB CHARSET=utf8'
CaseMessage=Table 'zzhtest.dao_country' doesn't exist
at org.nutz.dao.impl.sql.run.NutDaoExecutor.exec(NutDaoExecutor.java:102)
at org.nutz.dao.DaoInterceptorChain.doChain(DaoInterceptorChain.java:66)
at org.nutz.dao.impl.interceptor.SayHiDaoInterceptor.filter(SayHiDaoInterceptor.java:16)
·······························
運行 JUnit 測試
一、找不到nutz-test.properties Not FOUND!!!
請注意，一定要叫這個名字，否則運行測試一定是不過的，詳細原因請看 /test/org/nutz/Nutzs.java 的源代碼
我當時的操作是：右擊項目 > New > Folder
打開test/org/nutz/TestAll.java ，然後用 JUnit 運行，結果報錯
log4j:WARN No appenders could be found for logger (org.nutz.resource.Scans).
java.lang.RuntimeException: nutz-test.properties Not FOUND!!! tmpl.nutz-test.properties is a example.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
二、數據庫保存出錯
org.nutz.dao.DaoException: !Nutz SQL Error: 'INSERT INTO t_goods(name,thumb) VALUES('AAA','*byte[len=1820]') '
1、window環境下修改my.ini，修改max_allowed_packe=20M
2、運行mysql命令，
mysql>set global max_allowed_packet = 2*1024*1024*10
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
三、刪除
我擦，這是怎麼個情況！是不是可能在創建數據庫表的過程中出現的問題，我刪除zzhtest數據庫，但是在刪除數據庫過程中，又出現了一個異常，
ERROR 1010 (HY000): Error dropping database(can't rmdir './zzhtest',errno:17)
找到MySQL安裝目錄下的Data文件夾，刪除zzhtest文件夾下文件，就能刪掉了;
然後重新新建zzhtest數據庫。
這一篇寫的有點亂，這是我運行nutz測試時遇到的幾個問題！
