mysql数据库连接出问题，提示超时 java.sql.SQLException: An attempt by a client to checkout a Connection has timed out.解决办法
mysql数据库连接出问题，提示超时，后来发现问题在于连接mysql数据库的jar包跟数据库版本不对应导致的，更换jar包一致就解决了。 ...
原文：报错： 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. 数据库连接超时
解决方法一： oracle data sqlplus as sysdba 连接到数据库 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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