flink datastream中实现 读取mysql数据,sql分析后,写入另一个mysql表
时间: 2023-12-14 07:40:14 浏览: 357
可以使用Flink的JDBC连接器来读取MySQL数据,并使用Flink SQL对数据进行分析和转换,然后再使用JDBC连接器将结果写入另一个MySQL表中。
以下是一个简单的示例代码:
```java
//创建Flink环境
StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
StreamTableEnvironment tableEnv = StreamTableEnvironment.create(env);
//创建MySQL连接器
JdbcConnectionOptions connectionOptions = JdbcConnectionOptions.builder()
.withUrl("jdbc:mysql://localhost:3306/mydatabase")
.withDriverName("com.mysql.jdbc.Driver")
.withUsername("myuser")
.withPassword("mypassword")
.build();
JdbcCatalog catalog = new JdbcCatalog("mycatalog", connectionOptions);
tableEnv.registerCatalog("mycatalog", catalog);
//读取MySQL数据
String sourceTable = "mytable";
String sql = "SELECT * FROM " + sourceTable;
Table source = tableEnv.sqlQuery(sql);
//SQL分析并转换
String resultTable = "result";
sql = "SELECT col1, col2, col3 FROM " + sourceTable + " WHERE col1 > 10";
Table result = tableEnv.sqlQuery(sql);
//写入MySQL表
JdbcOutputFormat jdbcOutputFormat = JdbcOutputFormat.buildJdbcOutputFormat()
.setDBUrl("jdbc:mysql://localhost:3306/mydatabase")
.setDrivername("com.mysql.jdbc.Driver")
.setUsername("myuser")
.setPassword("mypassword")
.setQuery("INSERT INTO myresulttable (col1, col2, col3) VALUES (?, ?, ?)")
.finish();
DataStream<Row> dataStream = tableEnv.toAppendStream(result, Row.class);
dataStream.addSink(new JdbcOutputSinkFunction(jdbcOutputFormat));
//执行任务
env.execute("MySQL to MySQL");
```
需要注意的是,在写入MySQL表时,需要使用JdbcOutputFormat和JdbcOutputSinkFunction来实现。其中,JdbcOutputFormat需要设置数据库连接信息和写入语句,JdbcOutputSinkFunction将Table转换为DataStream后,再使用JdbcOutputFormat将数据写入MySQL表中。
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