您好,登錄后才能下訂單哦!
(1)DatabaseMetaData:
package javase.jdbc; import java.sql.Connection; import java.sql.DatabaseMetaData; import java.sql.ResultSet; import java.sql.SQLException; public class DatabaseMetaDataDemo { public static void main(String[] args) { Connection connection = JDBCConnection.getConnection(); try { DatabaseMetaData dMetaData = connection.getMetaData(); // 實例化元數(shù)據(jù) System.out.println("數(shù)據(jù)庫名:" + dMetaData.getDatabaseProductName()); System.out.println("數(shù)據(jù)庫版本: " + dMetaData.getDatabaseProductVersion()); ResultSet resultSet = dMetaData.getPrimaryKeys(null, null, "users"); while (resultSet.next()) { System.out.println("表類別:" + resultSet.getString(1)); System.out.println("表模式:" + resultSet.getString(2)); System.out.println("表名稱:" + resultSet.getString(3)); System.out.println("列名稱:" + resultSet.getString(4)); System.out.println("主鍵:" + resultSet.getString(5)); System.out.println("主鍵名稱:" + resultSet.getString(6)); } } catch (SQLException e) { e.printStackTrace(); } } }
輸出:
數(shù)據(jù)庫名:MySQL 數(shù)據(jù)庫版本: 5.5.19 表類別:jdbcdemo 表模式:null 表名稱:users 列名稱:id 主鍵:1 主鍵名稱:PRIMARY
(2)ResultSetMetaData:
package javase.jdbc; import java.sql.Connection; import java.sql.PreparedStatement; import java.sql.ResultSetMetaData; import java.sql.SQLException; public class ResultSetMetaDataDemo { public static void main(String[] args) { String sql = "SELECT id,username,password,classId FROM users"; Connection connection = JDBCConnection.getConnection(); try { PreparedStatement pStatement = connection.prepareStatement(sql); ResultSetMetaData rSetMetaData = pStatement.getMetaData(); System.out.println("返回數(shù)據(jù)有" + rSetMetaData.getColumnCount() + "個字段"); if (rSetMetaData.isAutoIncrement(1)) System.out.println(rSetMetaData.getColumnName(1) + "字段是自增的"); } catch (SQLException e) { e.printStackTrace(); } } }
輸出:
返回數(shù)據(jù)有4個字段 id字段是自增的
免責聲明:本站發(fā)布的內(nèi)容(圖片、視頻和文字)以原創(chuàng)、轉(zhuǎn)載和分享為主,文章觀點不代表本網(wǎng)站立場,如果涉及侵權(quán)請聯(lián)系站長郵箱:is@yisu.com進行舉報,并提供相關(guān)證據(jù),一經(jīng)查實,將立刻刪除涉嫌侵權(quán)內(nèi)容。