JDBC 中的 ResultSetMetaData 是什么？其意义何在？

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。

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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));
}
}

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输出

Connection established......
Number of columns: 2
Column Label: mobile_brand
Column Name: mobile_brand
Table Name: dataset

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