使用springboot开发时，使用c3p0连接池。
引入的maven依赖：
<dependency>
<groupId>c3p0</groupId>
<artifactId>c3p0</artifactId>
<version>0.9.1.2</version>
</dependency>
c3p0的配置信息，写到application.properties配置文件中，需要注意的是，c3p0的数据库用户名是user不是username：
c3p0.jdbcUrl=jdbc:mysql://ip:port/dnname?useUnicode=true&characterEncoding=utf8&autoReconnect=true&failOverReadOnly=false
c3p0.user=root
c3p0.password=123456
c3p0.driverClass=com.mysql.jdbc.Driver
c3p0.minPoolSize=2
c3p0.maxPoolSize=10
c3p0.maxIdleTime=1800000
c3p0.acquireIncrement=3
c3p0.maxStatements=1000
c3p0.initialPoolSize=3
c3p0.idleConnectionTestPeriod=60
c3p0.acquireRetryAttempts=30
c3p0.acquireRetryDelay=1000
c3p0.breakAfterAcquireFailure=false
c3p0.testConnectionOnCheckout=false
springboot配置c3p0数据源datasource：
@Configuration
publicclassDatasourceConfiguration {
@Bean(name = "dataSource")
@Qualifier(value = "dataSource")
@Primary
@ConfigurationProperties(prefix = "c3p0")
publicDataSource dataSource()
{
returnDataSourceBuilder.create().type(com.mchange.v2.c3p0.ComboPooledDataSource.class).build();
}
}
