我有一个使用 Tomcat JDBC 连接池的服务器应用程序。
这是我用来创建数据源的代码:
PoolProperties connProperties = new PoolProperties();
connProperties.setUrl(resources.getProperty("db.url"));
connProperties.setDriverClassName(resources.getProperty("db.driver"));
connProperties.setUsername(resources.getProperty("db.user"));
connProperties.setPassword(resources.getProperty("db.password"));
connProperties.setJmxEnabled(true);
connProperties.setTestWhileIdle(false);
connProperties.setValidationQuery("SELECT 1");
connProperties.setTestOnReturn(false);
connProperties.setValidationInterval(30000);
connProperties.setTimeBetweenEvictionRunsMillis(30000);
connProperties.setMaxActive(500);
connProperties.setInitialSize(50);
connProperties.setMaxWait(10000);
connProperties.setRemoveAbandonedTimeout(60);
connProperties.setMinEvictableIdleTimeMillis(60000);
connProperties.setSuspectTimeout(60);
connProperties.setMaxIdle(50);
connProperties.setMinIdle(10);
connProperties.setLogAbandoned(false);
connProperties.setRemoveAbandoned(true);
connProperties.setJdbcInterceptors("org.apache.tomcat.jdbc.pool.interceptor.ConnectionState;"+
"org.apache.tomcat.jdbc.pool.interceptor.StatementFinalizer");
dataSource = new DataSource();
dataSource.setPoolProperties(connProperties);
然后我有一种从池中获取连接的方法
protected Connection getDbConnection() throws Exception
{
dbConn = dataSource.getConnection();
return dbConn;
}
每次我想执行一条语句时,我都会调用这段代码:
protected CallableStatement executeCSqlQuery(String sql) throws Exception
{
CallableStatement cstmt;
ResultSet rs = null;
try {
cstmt = getDbConnection().prepareCall(sql);
cstmt.execute();
} catch (SQLException e) {
throw e;
}
return cstmt;
}
这是调用前面代码的示例:
try {
cstmt = dbConnection.executeCSqlQuery(query);
rs = cstmt.getResultSet();
} catch (Exception e) {
// do smething
} finally {
try {
if (cstmt != null) {
cstmt.close();
}
dbConnection.shutdown();
} catch (Exception e) {
// do something
}
}
public void shutdown() {
if (this.dbConn != null)
this.dbConn.close();
}
我面临的问题是,当我每隔 X 秒在线程中执行一次调用时,我会时不时地收到一个异常“语句已关闭”。我不确定为什么会这样。我认为这可能是驱动程序错误或与数据库的连接失败(在不同的服务器上运行)。
我没主意了。我错过了什么?
我应该改用c3p0连接池吗?