我在Tomcat中配置连接池时遇到以下异常
这是Context.xml
<Context path="/DBTest" docBase="DBTest"
debug="5" reloadable="true" crossContext="true">
<!-- maxActive: Maximum number of dB connections in pool. Make sure you
configure your mysqld max_connections large enough to handle
all of your db connections. Set to -1 for no limit.
-->
<!-- maxIdle: Maximum number of idle dB connections to retain in pool.
Set to -1 for no limit. See also the DBCP documentation on this
and the minEvictableIdleTimeMillis configuration parameter.
-->
<!-- maxWait: Maximum time to wait for a dB …Run Code Online (Sandbox Code Playgroud) 在WPF应用程序中,我想检查LINQ to SQL查询的返回是否包含一些记录,但我的方法不起作用:
TdbDataContext context = new TdbDataContext();
var sh = from p in context.Items where p.Selected == true select p;
if (sh == null)
{
MessageBox.Show("There are no Selected Items");
}
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我哪里错了?
每当我在eclipse中执行文件搜索时,它会扫描所有文件,包括.svn-base文件.
提供我*用于文件名模式.
是否可以扫描所有文件进行搜索但跳过.svn-base文件?
有人可以告诉我之间的区别:
int *p;
p=(int*)malloc(10*sizeof(int));
free(p);
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要么
int *p;
p=(int*)malloc(10*sizeof(int));
p=NULL;
Run Code Online (Sandbox Code Playgroud) 这个显然是一个函数指针:
typedef int (* foobar) (int a, unsigned char *b, unsigned int c);
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但是这个做了什么?
typedef int (foobar *) (int a, unsigned char *b, unsigned int c);
Run Code Online (Sandbox Code Playgroud) 我想知道我的活动会在什么时候打来电话?我的活动状态会被保存还是我必须明确保存?
另一个问题是,呼叫断开后活动是否会恢复?
请帮忙..!