Question

有人可以告诉我如何将java文件连接到postgresql数据库（如果可能，请使用代码n说明）

Answer 1

Google是一个好的开始

http://jdbc.postgresql.org/

Answer 2

以下是test.java

的示例

import java.sql.*;

class test
{
        public static void main(String[] args) {
                String hostname="", dbname="", username="", password="";
                try {
                        int argno = 0;
                        hostname = args[argno++]; 
                        dbname = args[argno++]; 
                        username = args[argno++]; 
                        password = args[argno++]; 
                } catch (Exception ex) {
                        System.err.println("Usage: java -cp driver.jar:. test [hostname] [dbname] [username] [password]");
                        System.exit(1);
                }
                try {
                        Class.forName("org.postgresql.Driver");
                        Connection connection =
                                DriverManager.getConnection(
                                        "jdbc:postgresql://"+hostname+"/"+dbname,
                                        username,
                                        password
                                );
                        ResultSet rs = connection.createStatement().executeQuery(
                                "select version() as version"  
                        );
                        while ( rs.next() ) {
                                System.out.println(rs.getString("version"));
                        }
                } catch (Exception ex) {
                        ex.printStackTrace();
                }
        }
}

从current driver下载JDBC download page，编译并在Unices上运行如下：

java -cp [driver_file_name].jar:. test [hostname] [dbname] [username] [password]

在Windows上：

java -cp [driver_file_name].jar;. test [hostname] [dbname] [username] [password]

与PostgreSQL的Java连接

3 个答案: