ResultSetMetaData 提供有关获取的 ResultSet 对象的信息，例如列数、列名称、列数据类型、表名称等...
以下是 ResultSetMetaData 类的一些方法。
| 方法 | 说明 |
|---|---|
| getColumnCount() | 检索当前 ResultSet 对象中的列数。 | tr>
| getColumnLabel() | 检索列的建议名称 |
| getColumnName() | 检索列的名称。 |
| getTableName() | 检索表的名称。 |
示例
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.Statement;
public class ResultSetMetadataExample {
public static void main(String args[]) throws Exception {
//Registering the Driver
DriverManager.registerDriver(new com.mysql.jdbc.Driver());
//Getting the connection
String mysqlUrl = "jdbc:mysql://localhost/TestDB";
Connection con = DriverManager.getConnection(mysqlUrl, "root", "password");
System.out.println("Connection established......");
//Creating a Statement object
Statement stmt = con.createStatement();
//Retrieving the data
ResultSet rs = stmt.executeQuery("select * from Dataset");
ResultSetMetaData rsMetaData = rs.getMetaData();
//Number of columns
System.out.println("Number of columns: "+rsMetaData.getColumnCount());
//Column label
System.out.println("Column Label: "+rsMetaData.getColumnLabel(1));
//Column name
System.out.println("Column Name: "+rsMetaData.getColumnName(1));
//Number of columns
System.out.println("Table Name: "+rsMetaData.getTableName(1));
}
}输出
Connection established...... Number of columns: 2 Column Label: mobile_brand Column Name: mobile_brand Table Name: dataset
