java sql隨機行打印

Question

我嘗試打印隨機行，但我不能，如何打印隨機行？

-數據庫名稱測試-表名稱user_data

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;

public class sqlconnect {
public static void main(String args[]) {
try {

Class.forName("com.mysql.jdbc.Driver");
Connection con=DriverManager.getConnection("jdbc:mysql://localhost:3306/test","root",""); 
Statement stmt = con.createStatement();
ResultSet rs=stmt.executeQuery("select * from user_data ORDER BY RANDOM() OFFSET 0 ROWS FETCH NEXT 1 ROW ONLY");

while(rs.next())

System.out.println(rs.getString(1)); 
con.close();
} 
catch (Exception e){ System.out.println(e);} 
}
}

我嘗試此代碼，這是錯誤消息

com.mysql.jdbc.exceptions.MySQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'OFFSET 0 ROWS FETCH NEXT 1 ROW ONLY' at line 1

Answer 1

如果只想打印隨機行，則使用LIMIT 1告訴MySQL將結果集限制為一個記錄：

SELECT * FROM user_data ORDER BY RAND() LIMIT 1

碼：

ResultSet rs = stmt.executeQuery("SELECT * FROM user_data ORDER BY RAND() LIMIT 1");

您對FETCH NEXT使用似乎是SQL Server語法（ 此處 qv）。