如何在JDBC中建立连接池? [英] How to establish a connection pool in JDBC?
问题描述
谁能提供有关如何建立 JDBC 连接池的示例或链接?
Can anybody provide examples or links on how to establish a JDBC connection pool?
通过搜索谷歌,我看到了许多不同的方法,而且相当混乱.
From searching google I see many different ways of doing this and it is rather confusing.
最终我需要代码来返回一个 java.sql.Connection
对象,但我在开始时遇到了问题......欢迎提出任何建议.
Ultimately I need the code to return a java.sql.Connection
object, but I am having trouble getting started..any suggestions welcome.
更新:javax.sql
或 java.sql
没有池化连接实现吗?为什么不最好使用这些?
Update: Doesn't javax.sql
or java.sql
have pooled connection implementations? Why wouldn't it be best to use these?
推荐答案
如果您需要一个独立的连接池,我的首选方法是 C3P0 超过 DBCP(我在这个以前的答案),我刚刚有重负载下 DBCP 问题太多.使用 C3P0 非常简单.来自文档:
If you need a standalone connection pool, my preference goes to C3P0 over DBCP (that I've mentioned in this previous answer), I just had too much problems with DBCP under heavy load. Using C3P0 is dead simple. From the documentation:
ComboPooledDataSource cpds = new ComboPooledDataSource();
cpds.setDriverClass( "org.postgresql.Driver" ); //loads the jdbc driver
cpds.setJdbcUrl( "jdbc:postgresql://localhost/testdb" );
cpds.setUser("swaldman");
cpds.setPassword("test-password");
// the settings below are optional -- c3p0 can work with defaults
cpds.setMinPoolSize(5);
cpds.setAcquireIncrement(5);
cpds.setMaxPoolSize(20);
// The DataSource cpds is now a fully configured and usable pooled DataSource
但是如果您在应用程序服务器内部运行,我建议使用它提供的内置连接池.在这种情况下,您需要对其进行配置(请参阅应用服务器的文档)并通过 JNDI 检索数据源:
But if you are running inside an application server, I would recommend to use the built-in connection pool it provides. In that case, you'll need to configure it (refer to the documentation of your application server) and to retrieve a DataSource via JNDI:
DataSource ds = (DataSource) new InitialContext().lookup("jdbc/myDS");
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