參考：
mysql 儲存過程中動態執行 sql 文
2 + pow ?,mysql>prepa re stmt1 from 'select sqrt pow ?.2 as hypotenuse';
mysql>set @a = 3;
mysql>set @b = 4;
@b; class=userinputexecute stmt1 using @a.>
mysql>set @a = 'select * from table1 ';
mysql>set @b = 'where column1>10 limit 1';
@b mysql>set @a =concat @a.;
mysql>prepa re stmt1 from@a;
mysql>execute stmt1;
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