mysql - 当“LIKE”查询与 sqljocky5 包一起使用时，服务器以空结果响应

Question

您好，我是 Flutter 的新手，我正在尝试根据用户输入的关键字从 MYSQL 数据库中获取数据。但即使数据存在，结果也是空的。我正在使用 msqljocky5 包进行 MYSQL 连接。

 Future<Results> getProducts()async{
   if(searchValue==""){
   ConnectionSettings settings = new ConnectionSettings(
       host: '10.0.2.2',
       port: 3306,
       user: 'root',
       password:'',
       db: 'master'
   );
   dynamic db =  await MySqlConnection.connect(settings);
  try{
    Results results =   await (await db
        .execute('SELECT * from product'))
        .deStream();
    await db.close();
    return (results);
  }catch(e){
    print("Error01"+e.toString());
  }
   }else{
     ConnectionSettings settings = new ConnectionSettings(
         host: '10.0.2.2',
         port: 3306,
         user: 'root',
         password:'',
         db: 'master'
     );
     dynamic db =  await MySqlConnection.connect(settings);
     try{
       print("Serach valuse is "+searchValue);
       Results results =   await (await db
           .prepared('SELECT * from product WHERE productName LIKE "%?%"',[searchValue]))
           .deStream();
       await db.close();
       print("AffectedRows"+results.affectedRows.toString());
       print(results);
       results.forEach((rw.Row rw) {print(rw[0]); });
       return (results);
     }catch(e){
       print("Error01"+e.toString());
     }
   }}

Answer 1

编辑代码帮助我解决了这个问题。

Results results =   await (await db
       .execute('SELECT * from product WHERE productName LIKE "$searchValue%"'))
       .deStream();