请教aspectj.jar包的问题
我操作mysql数据库的代码如下:
Connection con=null;
String dbname = "com.mysql.jdbc.Driver";
String dburl = "jdbc:mysql://localhost:3306/testdb?useUnicode=true&characterEncoding=GB2312";
String dbUser = "root";
String dbPwd = "hhhhhh";
try
{
Class.forName(dbname);
DriverManager.registerDriver(new com.mysql.jdbc.Driver());
con = DriverManager.getConnection(dburl, dbUser, dbPwd);
} catch (Exception e)
{
}
刚开始的时候,在执行Class.forName(dbname);的时候,出现错误,说是什么文件找不到,这个问题我已经在csdn上发帖请教过了。
后来知道,是缺少aspectj.jar文件,我就下载了最新的aspectj.jar文件。加载这个aspectj.jar文件后,执行Class.forName(dbname);不再出错了。
但是,在执行con = DriverManager.getConnection(dburl, dbUser, dbPwd);的时候,出现了很多提示,如下:
Thu Nov 25 12:46:34 CST 2010 TRACE: --> Connection.java:3221 com.mysql.jdbc.Connection.execSQL(null, "SET character_set_results = NULL", -1, null, 1003, 1007, false, "testdb", true, false)
Thu Nov 25 12:46:34 CST 2010 TRACE: --> ConnectionProperties.java:2140 com.mysql.jdbc.ConnectionProperties.getGatherPerformanceMetrics()
Thu Nov 25 12:46:34 CST 2010 TRACE: --> ConnectionProperties.java:90 com.mysql.jdbc.ConnectionProperties$BooleanConnectionProperty.getValueAsBoolean()
Thu Nov 25 12:46:34 CST 2010 TRACE: <-- ConnectionProperties.java:90 com.mysql.jdbc.ConnectionProperties$BooleanConnectionProperty.getValueAsBoolean(..) returning false
Thu Nov 25 12:46:34 CST 2010 TRACE: <-- ConnectionProperties.java:2140 com.mysql.jdbc.ConnectionProperties.getGatherPerformanceMetrics(..) returning false
Thu Nov 25 12:46:34 CST 2010 TRACE: --> ConnectionProperties.java:2149 com.mysql.jdbc.ConnectionProperties.getHighAvailability()
Thu Nov 25 12:46:34 CST 2010 TRACE: <-- ConnectionProperties.java:2149 com.mysql.jdbc.ConnectionProperties.getHighAvailability(..) returning false
Thu Nov 25 12:46:34 CST 2010 TRACE: --> ConnectionProperties.java:2654 com.mysql.jdbc.ConnectionProperties.getUseUnicode()
Thu Nov 25 12:46:34 CST 2010 TRACE: <-- ConnectionProperties.java:2654 com.mysql.jdbc.ConnectionProperties.getUseUnicode(..) returning true
Thu Nov 25 12:46:34 CST 2010 TRACE: --> ConnectionProperties.java:2113 com.mysql.jdbc.ConnectionProperties.getEncoding()
Thu Nov 25 12:46:34 CST 2010 TRACE: <-- ConnectionProperties.java:2113 com.mysql.jdbc.ConnectionProperties.getEncoding(..) returning "utf8"
Thu Nov 25 12:46:34 CST 2010 TRACE: --> MysqlIO.java:1665 com.mysql.jdbc.MysqlIO.sqlQueryDirect(null, "SET character_set_results = NULL", "utf8", null, -1, com.mysql.jdbc.Connection@1bd427, 1003, 1007, false, "testdb", true)
..................................
后面还有很多很多提示,写下了。
这个问题也就是我昨天在csdn的这个版块上发帖请教的问题。
也就是在执行连接数据库的时候,出现了很多很多的提示,这些提示print结束,需要15-20s的时间,
请教高手,这是什么原因?