换个姿势访问openGauss？（二十六）使用编程语言访问

#openGauss #入门 #安装 #数据库

删除操作

• 使用Statement进行删除，然后执行查询语句判断删除是否成功。

  import java.sql.Connection;
  import java.sql.DriverManager;
  import java.sql.PreparedStatement;
  import java.sql.ResultSet;
  import java.sql.SQLException;
  import java.sql.Statement;
  import java.util.Properties;
  
  public class JdbcConn {
      public static void main(String[] args) throws SQLException {
          Connection conn = getConnect();
          Statement statement = conn.createStatement();
          statement.execute("delete from test where id =4");
          PreparedStatement preparedStatement=conn.prepareStatement("select * from test;");
          ResultSet resultSet=preparedStatement.executeQuery();
          while (resultSet.next()){
              System.out.println(resultSet.getObject("id")+"  "+
                      resultSet.getObject("name"));
          }
          conn.close();
      }
      public static Connection getConnect() {
          String driver = "org.opengauss.Driver";
          String sourceURL = "jdbc:opengauss://10.244.50.251:33700/test_l?user=ltest&password=tiange1999?";
          Properties info = new Properties();
          Connection conn = null;
          try {
              Class.forName(driver);
          } catch (Exception var9) {
              var9.printStackTrace();
              return null;
          }
          try {
              conn = DriverManager.getConnection(sourceURL);
              System.out.println("连接成功！");
              return conn;
          } catch (Exception var8) {
              var8.printStackTrace();
              return null;
          }
      }
  }
  

• 使用preparedStatement进行删除，然后执行查询语句判断删除是否成功。

  import java.sql.Connection;
  import java.sql.DriverManager;
  import java.sql.PreparedStatement;
  import java.sql.ResultSet;
  import java.sql.SQLException;
  import java.sql.Statement;
  import java.util.Properties;
  
  public class JdbcConn {
      public static void main(String[] args) throws SQLException {
          Connection conn = getConnect();
          Statement statement = conn.createStatement();
          PreparedStatement preparedStatement=conn.prepareStatement("delete from test where id =2");
          preparedStatement.execute();
          preparedStatement=conn.prepareStatement("select * from test;");
          ResultSet resultSet=preparedStatement.executeQuery();
          while (resultSet.next()){
              System.out.println(resultSet.getObject("id")+"  "+
                      resultSet.getObject("name"));
          }
          conn.close();
      }
      public static Connection getConnect() {
          String driver = "org.opengauss.Driver";
          String sourceURL = "jdbc:opengauss://10.244.50.251:33700/test_l?user=ltest&password=tiange1999?";
          Properties info = new Properties();
          Connection conn = null;
          try {
              Class.forName(driver);
          } catch (Exception var9) {
              var9.printStackTrace();
              return null;
          }
          try {
              conn = DriverManager.getConnection(sourceURL);
              System.out.println("连接成功！");
              return conn;
          } catch (Exception var8) {
              var8.printStackTrace();
              return null;
          }
      }
  }
  

#openGauss #入门 #安装 #数据库