今天oracle群上有人問mysql可不可以執行動態的sql語句，搜了一下，居然可以。
set @tsql='select * from companyinfo';
prepare stmt1 from @tsql;
execute stmt1;
set @fid='fid';
set @table1='companyinfo';
set @tsql=concat('select ',@fid,' from ',@table1);
prepare stmt1 from @tsql;
execute stmt1;
mysql> use test
database changed
mysql> set @fid='fid';
query ok, 0 rows affected (0.00 sec)
mysql> set @table1='companyinfo';
query ok, 0 rows affected (0.00 sec)
mysql> set @tsql=concat('select ',@fid,' from ',@table1);
query ok, 0 rows affected (0.00 sec)
mysql> prepare stmt1 from @tsql;
query ok, 0 rows affected (0.00 sec)
statement prepared
mysql> execute stmt1;
+------+
| fid |
+------+
| 1001 |
+------+
1 row in set (0.00 sec)
mysql> use test
database changed
mysql> set @tsql='select titleof into @ename from employeelist where eid=2';
query ok, 0 rows affected (0.00 sec)
mysql> prepare stmt1 from @tsql;
query ok, 0 rows affected (0.00 sec)
statement prepared
mysql> execute stmt1;
query ok, 1 row affected (0.00 sec)
mysql> select @ename;
+-----------+
| @ename |
+-----------+
| 榪炶姵鑺? |
+-----------+
1 row in set (0.00 sec)
mysql>
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