flink SQL获取oracle通过dataGuard备库的数据
时间: 2023-12-20 21:07:07 浏览: 32
要在Flink SQL中获取Oracle通过DataGuard备库的数据,你可以使用以下步骤:
1. 首先,在Oracle主库上创建一个物化视图,该视图将数据同步到备库上。可以使用以下语句创建物化视图:
```
CREATE MATERIALIZED VIEW mv_name
AS SELECT * FROM table_name@db_link;
```
其中,`mv_name` 是物化视图的名称,`table_name` 是要同步的表的名称,`db_link` 是指向备库的数据库链接名称。
2. 然后,在Flink SQL中使用以下语句查询物化视图:
```
SELECT * FROM mv_name;
```
这将返回备库上的数据。
需要注意的是,如果你使用的是Flink SQL的批处理模式,你需要使用Oracle的`DBMS_MVIEW`包手动刷新物化视图。如果你使用的是Flink SQL的流处理模式,则可以使用Flink的定时器来定期刷新物化视图。
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flink cdc Java程序获取oracle通过dataGuard产生的备库的数据的代码
以下是使用 Flink CDC 获取 Oracle 数据库备库数据的 Java 代码示例:
```java
import org.apache.flink.api.common.functions.MapFunction;
import org.apache.flink.api.common.serialization.SimpleStringSchema;
import org.apache.flink.streaming.api.datastream.DataStream;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.streaming.connectors.kafka.FlinkKafkaConsumer;
import org.apache.flink.table.api.EnvironmentSettings;
import org.apache.flink.table.api.bridge.java.StreamTableEnvironment;
import org.apache.flink.table.descriptors.*;
import org.apache.flink.types.Row;
import java.util.Properties;
public class OracleDataGuardCDC {
private static final String KAFKA_TOPIC = "test_topic";
private static final String KAFKA_BOOTSTRAP_SERVERS = "localhost:9092";
private static final String ORACLE_HOST = "localhost";
private static final String ORACLE_PORT = "1521";
private static final String ORACLE_SID = "ORCL";
private static final String ORACLE_USERNAME = "username";
private static final String ORACLE_PASSWORD = "password";
private static final String ORACLE_TABLE_NAME = "test_table";
private static final String ORACLE_SCHEMA_NAME = "test_schema";
public static void main(String[] args) throws Exception {
EnvironmentSettings envSettings = EnvironmentSettings.newInstance().useBlinkPlanner().inStreamingMode().build();
StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
StreamTableEnvironment tableEnv = StreamTableEnvironment.create(env, envSettings);
Properties kafkaProps = new Properties();
kafkaProps.setProperty("bootstrap.servers", KAFKA_BOOTSTRAP_SERVERS);
kafkaProps.setProperty("group.id", "test_group");
FlinkKafkaConsumer<String> kafkaConsumer = new FlinkKafkaConsumer<>(KAFKA_TOPIC, new SimpleStringSchema(), kafkaProps);
DebeziumDebeziumSourceBuilder oracleSourceBuilder = DebeziumDebeziumSourceBuilder.create()
.fromOracleCdc(ORACLE_HOST, ORACLE_PORT, ORACLE_SID, ORACLE_USERNAME, ORACLE_PASSWORD)
.withSchemaIncludeList(ORACLE_SCHEMA_NAME)
.table(ORACLE_SCHEMA_NAME, ORACLE_TABLE_NAME);
tableEnv.executeSql("CREATE TABLE test_table (id INT, name STRING) WITH ('connector' = 'kafka', 'topic' = 'test_topic', 'properties.bootstrap.servers' = 'localhost:9092', 'properties.group.id' = 'test_group', 'format' = 'json')");
tableEnv.executeSql(oracleSourceBuilder.build().asSummaryString());
tableEnv.executeSql("INSERT INTO test_table SELECT id, name FROM debezium_source");
DataStream<Row> result = env.addSource(kafkaConsumer).map(new MapFunction<String, Row>() {
@Override
public Row map(String value) throws Exception {
return Row.of(value);
}
});
result.print();
env.execute("Oracle DataGuard CDC");
}
}
```
这段代码使用 Flink CDC 获取 Oracle 数据库备库数据,并将数据写入 Kafka 中。其中,DebeziumDebeziumSourceBuilder 是一个自定义的类,用于构建 Flink CDC 的 Source。需要根据实际情况修改相关参数。
flink cdc通过Java程序获取oracle备库的程序,以及所需要的依赖
您可以通过以下步骤获取Oracle备库的数据,并使用Flink CDC进行消费:
1. 首先,您需要在Java项目中添加以下依赖:
```xml
<dependency>
<groupId>org.apache.flink</groupId>
<artifactId>flink-connector-jdbc_2.11</artifactId>
<version>1.11.0</version>
</dependency>
<dependency>
<groupId>com.oracle.database.jdbc</groupId>
<artifactId>ojdbc8</artifactId>
<version>19.3.0.0</version>
</dependency>
```
2. 然后,您需要使用以下代码创建Flink CDC的JDBC连接:
```java
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.table.api.bridge.java.StreamTableEnvironment;
import java.util.Properties;
public class OracleCDCExample {
public static void main(String[] args) {
StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
StreamTableEnvironment tEnv = StreamTableEnvironment.create(env);
Properties properties = new Properties();
properties.setProperty("url", "jdbc:oracle:thin:@//<HOST>:<PORT>/<SERVICE_NAME>");
properties.setProperty("username", "<USERNAME>");
properties.setProperty("password", "<PASSWORD>");
properties.setProperty("scan.incremental.snapshot.parallelism", "1");
tEnv.executeSql("CREATE TABLE oracle_cdc_table (\n" +
" id INT,\n" +
" name STRING,\n" +
" age INT\n" +
") WITH (\n" +
" 'connector' = 'jdbc-cdc',\n" +
" 'driver' = 'oracle.jdbc.driver.OracleDriver',\n" +
" 'username' = '" + properties.getProperty("username") + "',\n" +
" 'password' = '" + properties.getProperty("password") + "',\n" +
" 'url' = '" + properties.getProperty("url") + "',\n" +
" 'table-name' = '<TABLE_NAME>',\n" +
" 'poll-interval' = '1s'\n" +
")");
}
}
```
3. 修改上述代码中的`<HOST>`、`<PORT>`、`<SERVICE_NAME>`、`<USERNAME>`、`<PASSWORD>` 和 `<TABLE_NAME>` 为您的Oracle备库主机名、端口、服务名、用户名、密码和要读取的表名。
4. 运行此代码,您将能够获取Oracle备库的数据。
注意:在使用JDBC连接器的过程中,您需要设置`scan.incremental.snapshot.parallelism`的值为1。