mysql 数据库连接配置

1.常用配置

jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=UTF-8

2.如果使用连接池，建议加上以下两个配置上，如果连接8个小时不是用回报错

Communications link failure

autoReconnect=true&failOverReadOnly=false





org.springframework.dao.RecoverableDataAccessException: PreparedStatementCallback; SQL [xxxxxx Communications link failure 

The last packet successfully received from the server was 10,066 milliseconds ago. The last packet sent successfully to the server was 10,065 milliseconds ago.; nested exception is com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure 

The last packet successfully received from the server was 10,066 milliseconds ago. The last packet sent successfully to the server was 10,065 milliseconds ago. 
at org.springframework.jdbc.support.SQLExceptionSubclassTranslator.doTranslate(SQLExceptionSubclassTranslator.java:100) 
at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:72) 
at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:81) 
at org.springframework.jdbc.core.JdbcTemplate.translateException(JdbcTemplate.java:1402) 
at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:620) 
at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:657) 
at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:682) 
at org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate.query(NamedParameterJdbcTemplate.java:171) 
at org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate.query(NamedParameterJdbcTemplate.java:179) 
at com.xhl.cuss.server.dao.impl.ServerDaoImpl.visitorUVDateList(ServerDaoImpl.java:596) 
at com.xhl.cuss.server.dao.impl.ServerDaoImpl$$FastClassBySpringCGLIB$$46506dab.invoke(<generated>) 
at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204) 
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java

3.需要注意的是，在xml配置文件中，url中的&符号需要转义成&。

url中的&符号需要转义成&。