Flink -sql - mysql数据同步版本一

1. 通过Flink Sql 将mysql 的数据同步到Mysql 中

套路

官网示例：

// create a TableEnvironment for batch or streaming execution
TableEnvironment tableEnv = ...; // see "Create a TableEnvironment" section

// create an input Table
tableEnv.executeSql("CREATE TEMPORARY TABLE table1 ... WITH ( 'connector' = ... )");
// register an output Table
tableEnv.executeSql("CREATE TEMPORARY TABLE outputTable ... WITH ( 'connector' = ... )");

// create a Table object from a Table API query
Table table2 = tableEnv.from("table1").select(...);
// create a Table object from a SQL query
Table table3 = tableEnv.sqlQuery("SELECT ... FROM table1 ... ");

// emit a Table API result Table to a TableSink, same for SQL result
TableResult tableResult = table2.executeInsert("outputTable");
tableResult...

总结为：
准备环境 ----> 准备源表 -----> 准备目标表

2.我的实现：

package com.wudl.flink.examples;

import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.table.api.EnvironmentSettings;
import org.apache.flink.table.api.SqlDialect;
import org.apache.flink.table.api.TableEnvironment;
import org.apache.flink.table.api.bridge.java.StreamTableEnvironment;

/**
 * @ClassName : FlinkSqlMysqlToMySql
 * @Description : Flink sql-mysql
 * @Author :wudl
 * @Date: 2021-08-24 23:28
 */

public class FlinkSqlMysqlToMySql {
    
    
    public static void main(String[] args) {
    
    

        String driverClass = "com.mysql.jdbc.Driver";

        String dbUrl = "jdbc:mysql://192.168.1.180:3306/MyFlink";
        String userNmae = "root";
        String passWord = "123456";
        StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
        env.setParallelism(1);
        StreamTableEnvironment tableEvn = StreamTableEnvironment .create(env);
        //1. 指定方言
        tableEvn.getConfig().setSqlDialect(SqlDialect.DEFAULT);
        String schema = "id INT ,name STRING";
        String source_table = "student";
        String sink_table = "SinkStudent";
        String flink_source_table = "mysource_student";
        String flink_sink_table = "SinkStudent";
        String base_sql = "CREATE TABLE IF NOT EXISTS %s (%s) " +
                "WITH (" +
                "'connector' = 'jdbc'," +
                "'url' = '" + dbUrl + "'," +
                "'table-name' = '%s'," +
                " 'username' = '" + userNmae + "'," +
                " 'password' = '" + passWord + "'" +
                " )";

        String source_ddl = String.format(base_sql, flink_source_table, schema, source_table);
        String sink_ddl = String.format(base_sql, flink_sink_table, schema, sink_table);
        tableEvn.executeSql(source_ddl);

        tableEvn.executeSql(sink_ddl);
        String insertsql = String.format("insert into %s select * from %s", flink_sink_table, flink_source_table);
        tableEvn.executeSql(insertsql);
        System.out.println("数据写入mysql成功");


    }
}