|NO.Z.00025|——————————|BigDataEnd|——|Hadoop&Flink.V09|——|Flink.v09|API详解|Flink DataStream|Sink|将流数据下沉到mysql|

一、导入mysql依赖

### --- 在pom.xml文件下写入mysql依赖

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.21</version>
        </dependency>

二、编程代码实现

### --- 编程代码实现：将流输出下沉到mysql

package com.yanqi.streamsink;

import org.apache.flink.configuration.Configuration;
import org.apache.flink.streaming.api.datastream.DataStreamSource;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.streaming.api.functions.sink.RichSinkFunction;
import org.apache.flink.streaming.api.functions.sink.SinkFunction;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;

public class MySinkToMySql {
    public static void main(String[] args) throws Exception {
        //mysql依赖地址：https://mvnrepository.com/
        StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
        String url = "jdbc:mysql://hadoop03:3306/bigdata?useUnicode=true&characterEncoding=UTF-8&serverTimezone=UTC";
        String user = "root";
        String password = "12345678";
        Student stu1 = new Student("lucas", 18);
        Student stu2 = new Student("jack", 28);
        DataStreamSource<Student> data = env.fromElements(stu1,stu2);

        data.addSink(new RichSinkFunction<Student>() {
            Connection connection = null;
            PreparedStatement preparedStatement = null;
            @Override
            public void open(Configuration parameters) throws Exception {
                connection = DriverManager.getConnection(url, user, password);
                String sql = "insert into student (name,age) values (?,?)";
                preparedStatement = connection.prepareStatement(sql);
            }

            @Override
            public void invoke(Student value, Context context) throws Exception {
                preparedStatement.setString(1,value.getName());
                preparedStatement.setInt(2,value.getAge());
                preparedStatement.executeUpdate();
            }

            @Override
            public void close() throws Exception {
                if(connection != null) {
                    connection.close();
                }
                if(preparedStatement != null) {
                    preparedStatement.close();
                }
            }
        });
        env.execute();
    }
}

### --- 编程代码实现：实体类

package com.yanqi.streamsink;

public class Student {
    String name;
    int age;

    public Student(String name, int age) {
        this.name = name;
        this.age = age;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    @Override
    public String toString() {
        return "Student{" +
                "name='" + name + '\'' +
                ", age=" + age +
                '}';
    }
}

三、编译打印

### --- 启动mysql数据库

~~~     # 启动数据库：在mysql的bigdata数据库下创建student表
[root@hadoop03 ~]# mysql -uroot -p
mysql> show create table student;
+---------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Table   | Create Table                                                                                                                                                                     |
+---------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| student | CREATE TABLE `student` (
  `id` int(11) DEFAULT NULL,
  `name` varchar(45) NOT NULL,
  `age` int(11) DEFAULT NULL,
  PRIMARY KEY (`name`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 |
+---------+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+

### --- 编译打印

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com.yanqi.streamsink.MySinkToMySql

~~~ 不会有任何参数输出
Process finished with exit code 0

### --- 在mysql下查看下沉的数据

[root@hadoop03 ~]# mysql -uroot -p
mysql> use bigdata;
mysql> select * from student;
+----+-------+------+
| id | name  | age  |
+----+-------+------+
|  1 | jack  |   28 |
|  2 | lucas |   18 |
+----+-------+------+

---

 

 

 

 

 

 

 

 

 

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Walter Savage Landor:strove with none,for none was worth my strife.Nature I loved and, next to Nature, Art:I warm'd both hands before the fire of life.It sinks, and I am ready to depart

                                                                                                                                                   ——W.S.Landor

---