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通过使用Flink DataStream Connectors 数据流连接器连接到Mysql数据源,并基于JDBC提供数据流输入与输出操作
示例环境
java.version: 1.8.xflink.version: 1.11.1mysql:5.7.x
数据流输入
DataStreamSource.java
package com.flink.examples.mysql; import com.flink.examples.TUser; import com.google.gson.Gson; import org.apache.flink.api.java.io.jdbc.JDBCOptions; import org.apache.flink.api.java.io.jdbc.JDBCTableSource; import org.apache.flink.streaming.api.datastream.DataStream; import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment; import org.apache.flink.table.api.DataTypes; import org.apache.flink.table.api.Table; import org.apache.flink.table.api.TableSchema; import org.apache.flink.table.api.bridge.java.StreamTableEnvironment; /** * @Description 将mysql表中数据查询输出到DataStream流中 */ public class DataStreamSource { /** * 官方文档:https://ci.apache.org/projects/flink/flink-docs-release-1.11/zh/dev/connectors/jdbc.html */ public static void main(String[] args) throws Exception { StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment(); StreamTableEnvironment tEnv = StreamTableEnvironment.create(env); //查询sql String sql = "SELECT id,name,age,sex,address,createTimeSeries FROM t_user"; //设置表视图字段与类型 TableSchema tableSchema = TableSchema.builder() .field("id", DataTypes.INT()) .field("name", DataTypes.STRING()) .field("age", DataTypes.INT()) .field("sex", DataTypes.INT()) .field("address", DataTypes.STRING()) //.field("createTime", DataTypes.TIMESTAMP()) .field("createTimeSeries", DataTypes.BIGINT()) .build(); //配置jdbc数据源选项 JDBCOptions jdbcOptions = JDBCOptions.builder() .setDriverName(MysqlConfig.DRIVER_CLASS) .setDBUrl(MysqlConfig.SOURCE_DRIVER_URL) .setUsername(MysqlConfig.SOURCE_USER) .setPassword(MysqlConfig.SOURCE_PASSWORD) .setTableName("t_user") .build(); JDBCTableSource jdbcTableSource = JDBCTableSource.builder().setOptions(jdbcOptions).setSchema(tableSchema).build(); //将数据源注册到tableEnv视图student中 tEnv.registerTableSource("t_user", jdbcTableSource); Table table = tEnv.sqlQuery(sql); DataStreamsourceStream = tEnv.toAppendStream(table, TUser.class); sourceStream.map((t)->new Gson().toJson(t)).print(); env.execute("flink mysql source"); } }
数据流输出
DataStreamSink.java
package com.flink.examples.mysql; import com.flink.examples.TUser; import org.apache.flink.api.java.io.jdbc.JDBCAppendTableSink; import org.apache.flink.streaming.api.datastream.DataStream; import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment; import org.apache.flink.table.api.DataTypes; import org.apache.flink.table.api.Table; import org.apache.flink.table.api.TableSchema; import org.apache.flink.table.api.bridge.java.StreamTableEnvironment; import org.apache.flink.table.sinks.TableSink; import static org.apache.flink.table.api.Expressions.$; /** * @Description 将DataStream数据流插入到mysql表中 */ public class DataStreamSink { /** * 官方文档:https://ci.apache.org/projects/flink/flink-docs-release-1.11/zh/dev/connectors/jdbc.html */ public static void main(String[] args) throws Exception { StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment(); env.setParallelism(1); env.enableCheckpointing(2000); StreamTableEnvironment tEnv = StreamTableEnvironment.create(env); //查询sql String sql = "insert into t_user (id,name,age,sex,address,createTimeSeries) values (?,?,?,?,?,?)"; //封装数据 TUser user = new TUser(); user.setId(0); user.setName("zhao1"); user.setAge(22); user.setSex(1); user.setAddress("CN"); user.setCreateTimeSeries(System.currentTimeMillis()); DataStreamsourceStream = env.fromElements(user); //从DataStream获取数据 // Expression id = ExpressionParser.parseExpression("id"); // Expression name = ExpressionParser.parseExpression("name"); // Expression age = ExpressionParser.parseExpression("age"); // Expression sex = ExpressionParser.parseExpression("sex"); // Expression address = ExpressionParser.parseExpression("address"); // Expression createTimeSeries = ExpressionParser.parseExpression("createTimeSeries"); // Table table = tEnv.fromDataStream(sourceStream, id, name, age, sex, address, createTimeSeries ); Table table = tEnv.fromDataStream(sourceStream,$("id"),$("name"),$("age"),$("sex"),$("address"),$("createTimeSeries")); //输出到mysql //设置表视图字段与类型 TableSchema tableSchema = TableSchema.builder() .field("id", DataTypes.INT()) .field("name", DataTypes.STRING()) .field("age", DataTypes.INT()) .field("sex", DataTypes.INT()) .field("address", DataTypes.STRING()) //.field("createTime", DataTypes.TIMESTAMP()) .field("createTimeSeries", DataTypes.BIGINT()) .build(); //设置sink输出jdbc TableSink tableSink = JDBCAppendTableSink.builder() .setDrivername(MysqlConfig.DRIVER_CLASS) .setDBUrl(MysqlConfig.SOURCE_DRIVER_URL) .setUsername(MysqlConfig.SOURCE_USER) .setPassword(MysqlConfig.SOURCE_PASSWORD) .setQuery(sql) .setParameterTypes(tableSchema.getFieldTypes()) .setBatchSize(100) .build(); //将数据源注册到tableEnv视图result中 tEnv.registerTableSink("result", tableSchema.getFieldNames(), tableSchema.getFieldTypes(), tableSink); //在指定的路径下注册,然后执行插入操作 table.executeInsert("result"); } }
数据源配置类
MysqlConfig.java
package com.flink.examples.mysql; /** * @Description Mysql数据库连接配置 */ public class MysqlConfig { public final static String DRIVER_CLASS="com.mysql.jdbc.Driver"; public final static String SOURCE_DRIVER_URL="jdbc:mysql://127.0.0.1:3306/flink?useUnicode=true&characterEncoding=utf-8&useSSL=false"; public final static String SOURCE_USER="root"; public final static String SOURCE_PASSWORD="root"; }
数据展示
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