在redshift上执行java程序
例如,我编写了以下php代码并在红移上运行,如下所示在redshift上执行java程序,java,amazon-web-services,amazon-redshift,Java,Amazon Web Services,Amazon Redshift,例如,我编写了以下php代码并在红移上运行,如下所示 <?php $connect = pg_connect("host=xx.xxxx.us-east-1.redshift.amazonaws.com port=xxxx dbname=testdb user=xxxx password=xxxxxx"); $query = "select name, email from mytable LIMIT 7"; $result = pg_query($connect,$query); w
<?php
$connect = pg_connect("host=xx.xxxx.us-east-1.redshift.amazonaws.com port=xxxx dbname=testdb user=xxxx password=xxxxxx");
$query = "select name, email from mytable LIMIT 7";
$result = pg_query($connect,$query);
while(($row = pg_fetch_array($result)) != null) {
$name = $row[0];
$email = $row[1];
echo $name." <<>> ".$email." <<>> ";
}
?>
我把这个.java
文件也保存在同一个位置。因此,有人能告诉我如何在命令上运行这个java文件,就像我对php所做的那样。(1)从以下链接下载postgresql JDBC驱动程序,并将其放在ConnectToCluster.java的同一目录中
import java.sql.*;
导入java.util.*;
公共类连接群集{
...
(3) 运行以下命令
javac ConnectToCluster.java&&java-cp.:postgresql-8.4-703.jdbc4.jar ConnectToCluster
这不是一个真正与红移相关的问题。你要问的是Thanx的java代码!非常感谢你的回答。我需要每次编译吗?我希望这个程序每天在特定的时间运行,我听说cronjob会这样做。如果你能就此提出建议,我将不胜感激。不,一旦你编译了java file,您不需要每次都编译它。说到cronjob,您需要更改类路径(cp选项)以使用绝对路径,如“-cp/path/to/your java file dir/:/path/to/your java file dir/postgresql-8.4-703.jdbc4.jar”因为cronjob的当前目录不同。好的,谢谢。我还有一个jar文件要包含在该项目中,我需要使用逗号作为分隔符并继续吗?比如-cp:postgresql-8.4-703.jdbc4.jar,另一个jarfile.jarI通过在两个单独的命令中编译和执行它来工作。比如javac-cp:one.jar:two.jar和java-cp:one.jar:two.jar
myuser@ip-20-143-43-144:/home/myuser$ php runquery.php <Enter>
public class ConnectToCluster {
static final String dbURL = "jdbc:postgresql://xxxx.xxxxx.us-east-1.redshift.amazonaws.com:xxxx/testdb";
static final String MasterUsername = "XXXX";
static final String MasterUserPassword = "XXXXXX";
public static void main(String[] args) {
Connection conn = null;
Statement stmt = null;
try{
//Dynamically load postgresql driver at runtime.
Class.forName("org.postgresql.Driver");
//Open a connection and define properties.
System.out.println("Connecting to database...");
Properties props = new Properties();
//Uncomment the following line if using a keystore.
//props.setProperty("ssl", "true");
props.setProperty("user", MasterUsername);
props.setProperty("password", MasterUserPassword);
conn = DriverManager.getConnection(dbURL, props);
//Try a simple query.
System.out.println("Listing system tables...");
stmt = conn.createStatement();
String sql;
sql = "select * from information_schema.tables;";
ResultSet rs = stmt.executeQuery(sql);
//Get the data from the result set.
while(rs.next()){
//Retrieve two columns.
String catalog = rs.getString("table_catalog");
String name = rs.getString("table_name");
//Display values.
System.out.print("Catalog: " + catalog);
System.out.println(", Name: " + name);
}
rs.close();
stmt.close();
conn.close();
}catch(Exception ex){
//For convenience, handle all errors here.
ex.printStackTrace();
}finally{
//Finally block to close resources.
try{
if(stmt!=null)
stmt.close();
}catch(Exception ex){
}// nothing we can do
try{
if(conn!=null)
conn.close();
}catch(Exception ex){
ex.printStackTrace();
}
}
System.out.println("Finished connectivity test.");
}
}