关于MySql链接url参数的设置_MySQL
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最近整理了一下网上关于MySql 链接url 参数的设置,有不正确的地方希望大家多多指教:
mysql JDBC URL格式如下:
jdbc:mysql://[host:port],[host:port].../[database][?参数名1][=参数值1][&参数名2][=参数值2]...
常用的几个较为重要的参数:
参数名称 参数说明 缺省值 最低版本要求
user 数据库用户名(用于连接数据库) 所有版本
passWord 用户密码(用于连接数据库) 所有版本
useUnicode 是否使用Unicode字符集,如果参数characterEncoding设置为gb2312或gbk,本参数值必须设置为true false 1.1g
characterEncoding 当useUnicode设置为true时,指定字符编码。比如可设置为gb2312或gbk false 1.1g
autoReconnect 当数据库连接异常中断时,是否自动重新连接? false 1.1
autoReconnectForPools 是否使用针对数据库连接池的重连策略 false 3.1.3
failOverReadOnly 自动重连成功后,连接是否设置为只读? true 3.0.12
maxReconnects autoReconnect设置为true时,重试连接的次数 3 1.1
initialTimeout autoReconnect设置为true时,两次重连之间的时间间隔,单位:秒 2 1.1
connectTimeout 和数据库服务器建立socket连接时的超时,单位:毫秒。 0表示永不超时,适用于JDK 1.4及更高版本 0 3.0.1
socketTimeout socket操作(读写)超时,单位:毫秒。 0表示永不超时 0 3.0.1
对应中文环境,通常mysql连接URL可以设置为:
jdbc:mysql://localhost:3306/test?user=root&password=&useUnicode=true&characterEncoding=utf8&autoReconnect=true&failOverReadOnly=false
在使用数据库连接池的情况下,最好设置如下两个参数:
autoReconnect=true&failOverReadOnly=false
需要注意的是,在xml配置文件中,url中的&符号需要转义成&。比如在tomcat的server.xml中配置数据库连接池时,mysql jdbc url样例如下:
jdbc:mysql://localhost:3306/test?user=root&password=&useUnicode=true&characterEncoding=utf8&autoReconnect=true&failOverReadOnly
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