摘要:
This MongoDB deployment does not support retryable writes. Please add retryWrites=false to your connection string. 此MongoDB部署不支持可重试写入。请将retryWrites=fa 阅读全文
摘要:
select substr("abcdef",2,5); 字符串标序从1开始 a b c d e f ↓ ↓ ↓ ↓ ↓ ↓ 1 2 3 4 5 6 语义是从第二个字符开始向后取5个字符,输出为: bcdef select substr("abcdef",2); 语义:从第二个字符开始取到结尾 阅读全文
摘要:
java.net.ConnectException: Call From Hadoop01/192.168.52.131 to Hadoop01:8032 failed on connection exception: java.net.ConnectException: Connection re 阅读全文