使用阿里云的MaxCompute查询sql时报错：DruidPooledPreparedStatement: getMaxFieldSize error

文章目录

• 问题描述
• 解决方法
• 解决思路

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问题描述

在使用阿里云MaxCompute查询sql时发现sql正常查询并返回数据，但是查看日志时发现有报错信息：

2025-10-16 20:16:44.907 ERROR 36832 --- [io-10111-exec-3] c.a.d.pool.DruidPooledPreparedStatement  : getMaxFieldSize error

java.sql.SQLFeatureNotSupportedException: null
	at com.aliyun.odps.jdbc.OdpsStatement.getMaxFieldSize(OdpsStatement.java:438)
	at com.alibaba.druid.filter.FilterChainImpl.statement_getMaxFieldSize(FilterChainImpl.java:2915)
	at com.alibaba.druid.filter.FilterAdapter.statement_getMaxFieldSize(FilterAdapter.java:2562)
	at com.alibaba.druid.filter.FilterChainImpl.statement_getMaxFieldSize(FilterChainImpl.java:2913)
	at com.alibaba.druid.proxy.jdbc.StatementProxyImpl.getMaxFieldSize(StatementProxyImpl.java:317)
	at com.alibaba.druid.pool.DruidPooledPreparedStatement.<init>(DruidPooledPreparedStatement.java:80)
	at com.alibaba.druid.pool.DruidPooledConnection.prepareStatement(DruidPooledConnection.java:359)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
...

解决方法

先说我这里的解决方法，将配置文件数据源配置中的spring.datasource.dynamic.druid.pool-prepared-statements和max-pool-prepared-statement-per-connection-size注释掉，因为pool-prepared-statements默认为false，所以在启动项目调用接口就可以看到没有报错了。

spring:
  datasource:
    primary: lake
    dynamic: #动态数据源配置
      druid:
        max-active: 50
        initial-size: 2
        max-wait: 600000
        min-idle: 2
#        pool-prepared-statements: true
#        max-pool-prepared-statement-per-connection-size: 20
        time-between-eviction-runs-millis: 60000
        min-evictable-idle-time-millis: 300000
        validation-query: select 1 #也会对数据湖查询检查
        test-while-idle: true
        test-on-borrow: true
        test-on-return: false
        filters: stat
        connectionProperties: druid.stat.mergeSql=true
      datasource:
        lake:
          driverClassName: com.aliyun.odps.jdbc.OdpsDriver
          url: jdbc:odps:https://xxx.maxcompute.aliyun-inc.com/api?project=xxx&accessId=xxx&accessKey=xxx&interactiveMode=true&autoSelectLimit=1000000
          druid:
            validation-query:

我这里使用的是mybatis-plus的多数据源，如果不想影响到其他的数据源，也可以单独配置

spring:
  datasource:
    primary: lake
    dynamic: #动态数据源配置
      druid:
        max-active: 50
        initial-size: 2
        max-wait: 600000
        min-idle: 2
        pool-prepared-statements: true
        max-pool-prepared-statement-per-connection-size: 20
        time-between-eviction-runs-millis: 60000
        min-evictable-idle-time-millis: 300000
        validation-query: select 1 #也会对数据湖查询检查
        test-while-idle: true
        test-on-borrow: true
        test-on-return: false
        filters: stat
        connectionProperties: druid.stat.mergeSql=true
      datasource:
        lake:
          driverClassName: com.aliyun.odps.jdbc.OdpsDriver
          url: jdbc:odps:https://xxx.maxcompute.aliyun-inc.com/api?project=xxx&accessId=xxx&accessKey=xxx&interactiveMode=true&autoSelectLimit=1000000
          druid:
            #数据湖不做查询检测
            validation-query:
            # 关闭预编译语句池化，只针对lake数据源
            pool-prepared-statements: false
            max-pool-prepared-statement-per-connection-size: 0

解决思路

回到报错日志

点击com.aliyun.odps.jdbc.OdpsStatement.getMaxFieldSize(OdpsStatement.java:438)，可以看到OdpsStatement类实现Statement接口，但是重写接口中的getMaxFieldSize()时是直接抛出一个异常。这里就可以想到，只要让程序在执行时不走这个方法即可。

继续向上追，进入com.alibaba.druid.pool.DruidPooledConnection.prepareStatement(DruidPooledConnection.java:359)。可以看到com.alibaba.druid.pool.DruidPooledConnection#prepareStatement(java.lang.String)这个方法是重写了java.sql.Connection#prepareStatement(java.lang.String)。

而 DruidPooledConnection 是阿里巴巴 Druid 数据库连接池框架中的核心接口，因此在配置文件中寻找，将prepareStatement相关的两个配置注释，执行代码时可以发现不会报错了。

继续向上追，最后会发现在com.alibaba.druid.pool.DruidPooledPreparedStatement#DruidPooledPreparedStatement中

public class DruidPooledPreparedStatement extends DruidPooledStatement implements PreparedStatement {

    ...
    private boolean pooled = false;

    public DruidPooledPreparedStatement(DruidPooledConnection conn, PreparedStatementHolder holder) throws SQLException{
        ...
        pooled = conn.getConnectionHolder().isPoolPreparedStatements();
        // Remember the defaults
        //当spring.datasource.dynamic.datasource.ics-datalake.druid.pool-prepared-statements=false时不走预编译的相关代码，从而解决执行代码报错问题
        if (pooled) {
            try {
                defaultMaxFieldSize = stmt.getMaxFieldSize();
            } catch (SQLException e) {
                LOG.error("getMaxFieldSize error", e);
            }
            ...
        }

        ...
    }

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