Tomcat JDBC连接池问题：“语句已关闭”

Question

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); 

protected Connection getDbConnection() throws Exception
{
    dbConn = dataSource.getConnection();
    return dbConn;
}

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;
}

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();
}

Answer 1

我创建了赏金来帮助Reznik，但我最终通过查看他的代码找到了问题所在。

问题是每次从池中获取新连接时

protected Connection getDbConnection() throws Exception
{
    dbConn = dataSource.getConnection();
    return dbConn;
}

对象dbconn被更新为新连接。

public void shutdown() {
    if (this.dbConn != null) 
        this.dbConn.close();
}

这样，不必总是更新连接，只需返回它，然后添加额外的逻辑来关闭从池中获取的连接。