connectionpooltimeoutexception:Time wating for connection from pool 怎么解决
时间: 2024-06-07 22:10:04 浏览: 9
这个错误通常是因为连接池中没有可用的连接,导致无法获取连接而引发的。以下是一些可能的解决方案:
1. 增加连接池大小:可以通过增加连接池大小来提高可用连接的数量,以减少这个错误的发生。
2. 减少连接超时时间:可以尝试减少连接超时时间,以便在连接池中有可用连接时更快地获取连接。
3. 检查数据库连接:检查数据库连接是否正常工作,可能是数据库出现了问题,导致连接无法获取。
4. 重启应用程序:有时重启应用程序可以解决此问题。如果其他解决方案无效,可以尝试重启应用程序。
5. 检查网络连接:检查网络连接是否正常,可能是网络连接出现了问题,导致连接无法获取。
希望以上解决方案能够帮到你解决问题。
相关问题
OPEN_scc: //Enroll Finger int counts=0; int BUFFER = 1; enroll_label: printf("Enroll Finger Test\n"); nRet = ZAZ_NO_FINGER; printf("1. Enroll: Please press finger1......\n"); while(nRet == ZAZ_NO_FINGER) { nRet=ZAZGetImage(nhanle,DEV_ADDR); counts++; if(counts > 10000000) printf("wating time over......\n"); else printf("wating time %d......\n",counts); } if(nRet != ZAZ_OK) { printf("ZAZGetImage is Fail ,errorr code = %d......\n",nRet); return 0; } printf("2. ZAZGetImage ok......\n"); //BYTE pImage[256*288]; //int nImageLen; //ZAZUpImage(DEV_ADDR,pImage,&nImageLen); //ZAZImgData2BMP(pImage,"fp.bmp"); nRet = ZAZGenChar(nhanle,DEV_ADDR,BUFFER); if(nRet != ZAZ_OK) { printf("ZAZGenChar is Fail ,errorr code = %d......\n",nRet); goto enroll_label; } printf("3. ZAZGenChar ok Buffer = %d......\n",BUFFER); BUFFER++; if(BUFFER < 3) goto enroll_label; nRet = ZAZRegModule(nhanle,DEV_ADDR); if(nRet != ZAZ_OK) { printf("ZAZRegModule is Fail ,errorr code = %d......\n",nRet); BUFFER = 1; goto enroll_label; } printf("4. ZAZRegModule ok \n"); nRet = ZAZStoreChar(nhanle,DEV_ADDR,CHAR_BUFFER_A,1); if(nRet != ZAZ_OK) { printf("ZAZStoreChar is Fail ,errorr code = %d......\n",nRet); BUFFER = 1; goto enroll_label; } printf("5. ZAZStoreChar ok id = %d\n",1); printf("END\n"); //Search Finger这段代码如何把标记替换掉,不用goto用其它方式实现
可以使用循环语句来代替goto语句,具体来说,可以使用while循环来实现。在while循环中设置一个条件,当条件满足时进行循环,否则跳出循环。在循环中对BUFFER进行操作,当BUFFER满足条件时跳出循环。下面是使用while循环实现的代码:
```
int counts=0;
int BUFFER = 1;
printf("Enroll Finger Test\n");
nRet = ZAZ_NO_FINGER;
printf("1. Enroll: Please press finger1......\n");
while(nRet == ZAZ_NO_FINGER) {
nRet=ZAZGetImage(nhanle,DEV_ADDR);
counts++;
if(counts > 10000000)
printf("wating time over......\n");
else
printf("wating time %d......\n",counts);
}
if(nRet != ZAZ_OK) {
printf("ZAZGetImage is Fail ,errorr code = %d......\n",nRet);
return 0;
}
printf("2. ZAZGetImage ok......\n");
//BYTE pImage[256*288];
//int nImageLen;
//ZAZUpImage(DEV_ADDR,pImage,&nImageLen);
//ZAZImgData2BMP(pImage,"fp.bmp");
while(BUFFER < 3) {
nRet = ZAZGenChar(nhanle,DEV_ADDR,BUFFER);
if(nRet != ZAZ_OK) {
printf("ZAZGenChar is Fail ,errorr code = %d......\n",nRet);
BUFFER = 1;
continue;
}
printf("3. ZAZGenChar ok Buffer = %d......\n",BUFFER);
BUFFER++;
}
nRet = ZAZRegModule(nhanle,DEV_ADDR);
if(nRet != ZAZ_OK) {
printf("ZAZRegModule is Fail ,errorr code = %d......\n",nRet);
BUFFER = 1;
continue;
}
printf("4. ZAZRegModule ok \n");
nRet = ZAZStoreChar(nhanle,DEV_ADDR,CHAR_BUFFER_A,1);
if(nRet != ZAZ_OK) {
printf("ZAZStoreChar is Fail ,errorr code = %d......\n",nRet);
BUFFER = 1;
continue;
}
printf("5. ZAZStoreChar ok id = %d\n",1);
printf("END\n");
```
使用while循环能够让代码更清晰易懂,避免了goto语句带来的混乱。
search_label: BUFFER = 1; printf("Search Finger Test\n"); nRet = ZAZ_NO_FINGER; printf("1. Search: Please press finger1......\n"); while(nRet == ZAZ_NO_FINGER) { nRet=ZAZGetImage(nhanle,DEV_ADDR); counts++; if(counts > 50) printf("wating time over......\n"); else printf("wating time %d......\n",counts); } if(nRet != ZAZ_OK) { printf("ZAZGetImage is Fail ,errorr code = %d......\n",nRet); return 0; } printf("2. ZAZGetImage ok......\n"); //BYTE pImage[256*288]; //int nImageLen; //ZAZUpImage(DEV_ADDR,pImage,&nImageLen); //ZAZImgData2BMP(pImage,"fp.bmp"); nRet = ZAZGenChar(nhanle,DEV_ADDR,BUFFER); if(nRet != ZAZ_OK) { printf("ZAZGenChar is Fail ,errorr code = %d......\n",nRet); goto search_label; } printf("3. ZAZGenChar ok Buffer = %d......\n",BUFFER); int nFinger; int nSorce; nRet = ZAZSearch(nhanle,DEV_ADDR,CHAR_BUFFER_A,0,200,&nFinger,&nSorce); if(nRet != ZAZ_OK) { printf("ZAZGenChar is Fail ,errorr code = %d......\n",nRet); goto search_label; } printf("4. ZAZSearch ok ID = %d Sorce = %d......\n",nFinger,nSorce); printf("END\n");这段代码转化成没有goto的写法
搜索指纹测试
int counts = 0;
int nRet = ZAZ_NO_FINGER;
while(nRet == ZAZ_NO_FINGER) {
nRet = ZAZGetImage(nhanle, DEV_ADDR);
counts++;
if(counts > 50) {
printf("等待时间已经超过50......\n");
return 0;
}
printf("等待时间 %d......\n", counts);
}
if(nRet != ZAZ_OK) {
printf("ZAZGetImage失败,错误代码=%d......\n", nRet);
return 0;
}
printf("ZAZGetImage完成......\n");
nRet = ZAZGenChar(nhanle, DEV_ADDR, BUFFER);
if(nRet != ZAZ_OK) {
printf("ZAZGenChar失败,错误代码=%d......\n", nRet);
return 0;
}
printf("ZAZGenChar完成,Buffer=%d......\n", BUFFER);
int nFinger;
int nSorce;
nRet = ZAZSearch(nhanle, DEV_ADDR, CHAR_BUFFER_A, 0, 200, &nFinger, &nSorce);
if(nRet != ZAZ_OK) {
printf("ZAZSearch失败,错误代码=%d......\n", nRet);
return 0;
}
printf("ZAZSearch完成,ID=%d,Sorce=%d......\n", nFinger, nSorce);
printf("结束\n");
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