amazon-web-services - 用于复制到 Redshift 的 Java sdk

Question

是否可以通过 java jdbc 连接从 S3 到 Redshift 触发复制命令？

示例：从 's3://' 复制测试 CREDENTIALS 'aws_access_key_id=xxxxxxx;aws_secret_access_key=xxxxxxxxx'

Answer 1

是的，尝试如下代码

String dbURL = "jdbc:postgresql://x.y.us-east-1.redshift.amazonaws.com:5439/dev";
String MasterUsername = "userame";
String MasterUserPassword = "password";

           Connection conn = null;
            Statement stmt = null;
            try{
               //Dynamically load postgresql driver at runtime.
               Class.forName("org.postgresql.Driver");


               System.out.println("Connecting to database...");
               Properties props = new Properties();


               props.setProperty("user", MasterUsername);
               props.setProperty("password", MasterUserPassword);
               conn = DriverManager.getConnection(dbURL, props);
               stmt = conn.createStatement();
               String sql="copy test from 's3://' CREDENTIALS     'aws_access_key_id=xxxxxxx;aws_secret_access_key=xxxxxxxxx'"
                int j = stmt.executeUpdate(sql);

                stmt.close();
               conn.close();
            }catch(Exception ex){
               //For convenience, handle all errors here.
               ex.printStackTrace();
            }

Answer 2

Sandesh 的答案非常好，但它使用 PostgreSql 驱动程序。AWS 提供 Redshift 驱动，优于 PostgreSql 驱动。其余的事情将保持不变。我希望这些信息可以帮助其他人。

1)JDBC Driver 将从org.postgresql.Driver变为 com.amazon.redshift.jdbcXX.Driver，其中 XX 是 Redshift 驱动的版本。例如42。

2)Jdbc url 将从postgreSQL变为redshift.

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.Statement;
import java.util.Properties;

public class RedShiftJDBC {
    public static void main(String[] args) {

        Connection conn = null;
        Statement statement = null;
        try {
            //Make sure to choose appropriate Redshift Jdbc driver and its jar in classpath
            Class.forName("com.amazon.redshift.jdbc42.Driver");
            Properties props = new Properties();
            props.setProperty("user", "username***");
            props.setProperty("password", "password****");

            System.out.println("\n\nconnecting to database...\n\n");
            //In case you are using postgreSQL jdbc driver.

            conn = DriverManager.getConnection("jdbc:redshift://********url-to-redshift.redshift.amazonaws.com:5439/example-database", props);

            System.out.println("\n\nConnection made!\n\n");

            statement = conn.createStatement();

            String command = "COPY my_table from 's3://path/to/csv/example.csv' CREDENTIALS 'aws_access_key_id=******;aws_secret_access_key=********' CSV DELIMITER ',' ignoreheader 1";

            System.out.println("\n\nExecuting...\n\n");

            statement.executeUpdate(command);
            //you must need to commit, if you realy want to have data copied.
            conn.commit();
            System.out.println("\n\nThats all copy using simple JDBC.\n\n");
            statement.close();
            conn.close();
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }
}