[MySQL] JDBC connection configuration

background

Some time ago, I always encountered the problem of database connection timeout. I changed the druid connection pool configuration and it still appeared. Then began to change the configuration of jdbcUrl, of course, it is still useless. Finally, the DBA changed the database configuration (max_allowed_packet), which is said to be useful. However, the production environment is performing well, and the pre-release environment is still not so good...

Speaking of the configuration of jdbcUrl, I usually copy various projects from side to side, and I haven’t read it specifically, so I’ll record it here.

Configuration

parameter

parameter	Description	Defaults	Common value
autoReconnect	auto connect	false	true
autoReconnectForPools	Automatic connection connection pool	false	true
characterEncoding	When useUnicode=true, specify the character set		UTF-8
allowMultiQueries	In a statement, it is allowed to use ";" to separate multiple queries	false	true
failOverReadOnly	When failover occurs in autoReconnect mode, should the connection be set to "read-only"	true	false
useSSL	Use SSL when communicating with the server	true	false
useUnicode	Whether to use Unicode	false	true
socketTimeout	When the database does not return, the waiting time (ms) is applied. Must be greater than or equal to the value of Socket TimeOut configured by the database	0	60000

General configuration

jdbc:mysql://host:port/databaseName?useSSL=false&autoReconnect=true&autoReconnectForPools=true&allowMultiQueries=true&useUnicode=true&characterEncoding=utf8

reference

mysql JDBC URL parameter analysis

Talk about the setting of jdbc socketTimeout

Description of several important parameters in MySQL JDBC URL

In-depth understanding of JDBC timeout settings

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