java sql随机行打印

Question

我尝试打印随机行但我不能，我如何打印随机行？

-数据库名称测试 -表名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);} 
}
}

我试试这个代码，这是错误信息

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

如果您只想打印随机行，请使用LIMIT 1 告诉 MySQL 将结果集限制为一条记录：

SELECT * FROM user_data ORDER BY RAND() LIMIT 1

代码：

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

您对FETCH NEXT 的使用似乎是SQL Server 语法（q.v. here）。