SpringBoot集成Flink-CDC，实现对数据库数据的监听

为了使用Spring Boot集成Apache Flink CDC来监听数据库变更，你需要按照以下步骤操作：

1. 在pom.xml中添加Flink CDC和MySQL Connector的依赖。
2. 配置Flink环境和CDC源。
3. 创建Flink作业来处理数据库变更事件。

以下是一个简化的代码示例：

pom.xml依赖添加（以Maven项目为例）:

<dependencies>
    <!-- Flink dependencies -->
    <dependency>
        <groupId>org.apache.flink</groupId>
        <artifactId>flink-java</artifactId>
        <version>${flink.version}</version>
    </dependency>
    <dependency>
        <groupId>org.apache.flink</groupId>
        <artifactId>flink-stream-java</artifactId>
        <version>${flink.version}</version>
    </dependency>
    <!-- Flink CDC for MySQL connector -->
    <dependency>
        <groupId>com.ververica</groupId>
        <artifactId>flink-connector-mysql-cdc</artifactId>
        <version>${flink-cdc-connector.version}</version>
    </dependency>
    <!-- MySQL Connector dependency -->
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>${mysql.connector.version}</version>
    </dependency>
</dependencies>

Flink作业配置和代码示例：

import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import com.ververica.cdc.connectors.mysql.source.MySqlSource;
import com.ververica.cdc.debezium.StringDebeziumDeserializationSchema;
 
public class FlinkCDCExample {
    public static void main(String[] args) throws Exception {
        StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
 
        MySqlSource<String> mySqlSource = MySqlSource.<String>builder()
                .hostname("your-db-host")
                .port(3306)
                .databaseList("your-database") // set captured database
                .tableList("your-database.your-table") // set captured table
                .username("your-username")
                .password("your-password")
                .deserializer(new StringDebeziumDeserializationSchema()) // converts the binlog into String format
                .build();
 
        env
                .addSource(mySqlSource)
                .print(); // print the captured data for now, you can replace this with your custom processing logic
 
        env.execute("Flink CDC MySQL Job");
    }
}

确保替换your-db-host, 3306, your-database, your-table, your-username, 和 your-password为你的数据库实际信息。

以上代码创建了一个简单的Flink作业，它会监听指定的MySQL表的变更并打印出来。你可以根据需要扩展这个作业来进行更复杂的处理。