Java使用JDBC连接postgresql数据库示例

本文实例讲述了java使用jdbc连接postgresql数据库。分享给大家供大家参考，具体如下：

package tool;
import java.sql.connection;
import java.sql.drivermanager;
import java.sql.preparedstatement;
import java.sql.resultset;
import java.sql.sqlexception;
public class psqlconnectiontool {
 private string url = "jdbc:postgresql://xxx.xxx.xxx.xxx:5432/testdb";
 private string username = "postgres";
 private string password = "postgres";
 private connection connection = null;
 public connection getconn() {
  try {
   class.forname("org.postgresql.driver").newinstance();
   connection = drivermanager.getconnection(url, username, password);
  } catch (instantiationexception e) {
   // todo auto-generated catch block
   e.printstacktrace();
  } catch (illegalaccessexception e) {
   // todo auto-generated catch block
   e.printstacktrace();
  } catch (classnotfoundexception e) {
   // todo auto-generated catch block
   e.printstacktrace();
  }catch (sqlexception e) {
   // todo auto-generated catch block
   e.printstacktrace();
  }
  return connection;
 }
 public resultset query(connection conn, string sql) {
  preparedstatement pstatement = null;
  resultset rs = null;
  try {
   pstatement = conn.preparestatement(sql);
   rs = pstatement.executequery();
  } catch (sqlexception e) {
   e.printstacktrace();
  }
  return rs;
 }
 public boolean queryupdate(connection conn, string sql) {
  preparedstatement pstatement = null;
  int rs = 0;
  try {
   pstatement = conn.preparestatement(sql);
   rs = pstatement.executeupdate();
  } catch (sqlexception e) {
   // todo auto-generated catch block
   e.printstacktrace();
  }
  if (rs > 0) {
   return true;
  }
  return false;
 }
 public static void main(string[] args) throws sqlexception {
  psqlconnectiontool pgtool = new psqlconnectiontool();
  connection myconn = pgtool.getconn();
  pgtool.queryupdate(myconn, "insert into test values (1,'smoon','man')");
  resultset rs = pgtool.query(myconn, "select * from test");
  while(rs.next()){
   int id = rs.getint("id");
   string name = rs.getstring("name");
   string gender = rs.getstring("gender");
   system.out.println("id:"+id+" 姓名："+name+" 性别："+gender);
   myconn.close();
  }
 }
}

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希望本文所述对大家java程序设计有所帮助。