Flink doesn‘t support ENFORCED mode for PRIMARY KEY constraint

二进制_博客2025-12-04 9:26

flinkCDC感知mysql中表的数据的变化的时候，准备采用flinksql来实现，实现代码如下：

java 复制代码

package com.bigdata.cdc;

import org.apache.flink.api.common.RuntimeExecutionMode;
import org.apache.flink.api.java.tuple.Tuple2;
import org.apache.flink.streaming.api.datastream.DataStream;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.table.api.Table;
import org.apache.flink.table.api.bridge.java.StreamTableEnvironment;
import org.apache.flink.types.Row;

/**
 * @基本功能:
 * @program:FlinkProject
 * @author: 闫哥
 * @create:2025-06-13 11:01:11
 **/
public class CdcSQLTest {

    public static void main(String[] args) throws Exception {

        //1. env-准备环境
        StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
        env.setRuntimeMode(RuntimeExecutionMode.AUTOMATIC);
        env.setParallelism(1);
        // 获取tableEnv对象
        // 通过env 获取一个table 环境
        StreamTableEnvironment tenv = StreamTableEnvironment.create(env);

        //2. 创建表对象
        //3. 编写sql语句
        //4. 将Table变为stream流
        tenv.executeSql("CREATE TABLE user_info2 (\n" +
                " id INT NOT NULL primary key,\n" +
                " name STRING,\n" +
                " age int\n" +
                ") WITH (\n" +
                " 'connector' = 'mysql-cdc',\n" +
                " 'hostname' = 'bigdata01',\n" +
                " 'port' = '3306',\n" +
                " 'username' = 'root',\n" +
                " 'password' = '123456',\n" +
                " 'scan.startup.mode' = 'latest-offset', " +
                " 'database-name' = 'cdc_test',\n" +
                " 'table-name' = 'user_info'\n" +
                ")");

        tenv.executeSql("select * from user_info2").print();

        Table table = tenv.sqlQuery("select * from user_info2");
        DataStream<Tuple2<Boolean, Row>> retractStream = tenv.toRetractStream(table, Row.class);
        retractStream.print();


        //5. execute-执行
        env.execute();
    }
}

以上代码会报如下错误：

java 复制代码

Exception in thread "main" org.apache.flink.sql.parser.error.SqlValidateException: Flink doesn't support ENFORCED mode for PRIMARY KEY constraint. ENFORCED/NOT ENFORCED controls if the constraint checks are performed on the incoming/outgoing data. Flink does not own the data therefore the only supported mode is the NOT ENFORCED mode

修改方案：

id INT NOT NULL primary key 修改为 id INT NOT NULL PRIMARY KEY NOT ENFORCED

因为如下：

测试结果如下：