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();
 }
}
}

希望本文所述对大家java程序设计有所帮助。

来源：https://blog.csdn.net/s465689853/article/details/81217448