postgresql 入门（含java、scala连接代码）

1、下载安装包

官网：http://www.postgresql.org/download/ 按自己需求，下载安装包，

我下载的windows版32位的。http://get.enterprisedb.com/postgresql/postgresql-9.4.0-1-windows.exe

2、安装

执行下载包，进行安装，请一定记住你输入的密码，如“pg”

3、打开数据库，创建表，插入数据

安装完成后，在开始菜单找到PostgreSQL 9.4 (x86)\pgAdmin III,打开 pgAdmin III，点击下图节点，输入密码“pg”

连接后如图

点击 ，在新打开的窗口输入下边语句，创建表，插入数据

CREATE TABLE users (
     uid    serial PRIMARY KEY ,
     name   varchar(40) NOT NULL CHECK (name <> ‘‘),
     pwd varchar(40) NOT NULL CHECK (name <> ‘‘),
     gender char(1),
     email varchar(40),
     birthday date
);
INSERT INTO users VALUES  (1, ‘zxh‘, ‘zxhpwd‘, ‘M‘, ‘[email protected]‘, ‘1984-07-13‘);
INSERT INTO users VALUES  (2, ‘zxh2‘, ‘zxh2pwd‘, ‘F‘, ‘[email protected]‘, ‘1984-07-13‘);

展开目录树， 选中表“users”，点“”查看数据

4、下载驱动

在打开也找到

打开psqljdbc，--“download”--然后找到下面

5、java链接postgresql

//psqlJDBC
//Publisher :	PostgreSQL Global Development Group
//驱动地址：http://jdbc.postgresql.org/download.html => http://jdbc.postgresql.org/download/postgresql-9.3-1102.jdbc41.jar
//本地下载：http://files.cnblogs.com/piaolingzxh/postgresql-9.3-1102.jdbc41.jar.zip
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.Statement;

public class postgres_jdbc {
	public static void main(String[] args) {
		try {
			Class.forName("org.postgresql.Driver").newInstance();
			String url = "jdbc:postgresql://localhost:5432/postgres";
			Connection con = DriverManager.getConnection(url, "postgres", "pg");
			Statement st = con.createStatement();
			String sql = " select * from users ";
			ResultSet rs = st.executeQuery(sql);
			ResultSetMetaData rsmd = rs.getMetaData();
			int columnCount = rsmd.getColumnCount();
			while (rs.next()) {
				for (int i = 1; i <= columnCount; i++) {
					System.out.print(rs.getString(i)+"\t");
				}
				System.out.println();
			}
			rs.close();
			st.close();
			con.close();

		} catch (Exception ee) {
			System.out.print(ee.getMessage());
		}
	}
}

6、scala连接数据库

//psqlJDBC
//Publisher : PostgreSQL Global Development Group
//驱动地址：http://jdbc.postgresql.org/download.html => http://jdbc.postgresql.org/download/postgresql-9.3-1102.jdbc41.jar
//本地下载：http://files.cnblogs.com/piaolingzxh/postgresql-9.3-1102.jdbc41.jar.zip
import java.sql.{ Connection, DriverManager, ResultSet };

object postgres_jdbc {
  val conn_str = "jdbc:postgresql://localhost:5432/postgres"
  classOf[org.postgresql.Driver]
  def main(args: Array[String]) {
    //classOf[org.postgresql.Driver]

    val conn = DriverManager.getConnection(conn_str, "postgres", "pg")
    try {
      // Configure to be Read Only
      val statement = conn.createStatement(ResultSet.TYPE_FORWARD_ONLY, ResultSet.CONCUR_READ_ONLY)

      // Execute Query
      val rs = statement.executeQuery("SELECT * FROM users")
      var columnCount = rs.getMetaData().getColumnCount();
      // Iterate Over ResultSet
      while (rs.next) {
        for (i <- 1 to columnCount) {
          System.out.print(rs.getString(i) + "\t");
        }
        System.out.println();
      }
    } finally {
      conn.close
    }
  }
}

7、PostgreSQL 8.1 中文文档

http://www.php100.com/manual/PostgreSQL8/