mysql數據庫連接出問題，提示超時 java.sql.SQLException: An attempt by a client to checkout a Connection has timed out.解決辦法
mysql數據庫連接出問題，提示超時，后來發現問題在於連接mysql數據庫的jar包跟數據庫版本不對應導致的，更換jar包一致就解決了。 ...
原文：報錯： Could not open JDBC Connection for transaction; nested exception is java.sql.SQLException: An attempt by a client to checkout a Connection has timed out. 數據庫連接超時
解決方法一： oracle data sqlplus as sysdba 連接到數據庫 SQL Plus: Release . . . . Production on Mon May : : Copyright c , , Oracle. All rights reserved. Connected to: Oracle Database g Enterprise Edition Release ...
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