是的,Apache Cassandra数据库有异步驱动程序。以下是使用Java编写的示例代码:
import com.datastax.driver.core.*;
public class CassandraAsyncDriverExample {
private Cluster cluster;
private Session session;
public void connect(String node, int port) {
cluster = Cluster.builder()
.addContactPoint(node)
.withPort(port)
.build();
session = cluster.connect();
}
public void close() {
session.close();
cluster.close();
}
public void insertDataAsync(String keyspace, String table, String columnName, String columnValue) {
String query = String.format("INSERT INTO %s.%s (%s) VALUES ('%s')", keyspace, table, columnName, columnValue);
session.executeAsync(query);
}
public void selectDataAsync(String keyspace, String table) {
String query = String.format("SELECT * FROM %s.%s", keyspace, table);
ResultSetFuture resultSetFuture = session.executeAsync(query);
resultSetFuture.addListener(() -> {
ResultSet resultSet = resultSetFuture.getUninterruptibly();
for (Row row : resultSet) {
System.out.println(row.toString());
}
}, MoreExecutors.directExecutor());
}
public static void main(String[] args) {
CassandraAsyncDriverExample example = new CassandraAsyncDriverExample();
example.connect("localhost", 9042);
example.insertDataAsync("mykeyspace", "mytable", "column1", "value1");
example.selectDataAsync("mykeyspace", "mytable");
example.close();
}
}
上述代码示例中,首先创建了一个Cluster
对象和一个Session
对象,然后通过connect
方法连接到Cassandra数据库。insertDataAsync
方法用于异步插入数据,selectDataAsync
方法用于异步查询数据。最后,在main
方法中进行了数据插入和查询,并通过close
方法关闭连接。