package org.thj;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement;
public class UserDAO {
public boolean exitUser(String username){
try{
Connection conn = DBConnection.getConnection();
Statement stmt = conn.createStatement();
ResultSet rs = stmt.executeQuery("select count(*) from user where username ='" + username +"'");
rs.next();
if(0 != rs.getInt(1))
return true;
return false;
}catch(Exception e){
System.out.println("DAO访问失败!");
return true;
}
}
}
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