极客教程准备语句时可以用哪些SQL语句？
事实上，并不是所有SQL语句都可以准备，因为MySQL只允许准备以下类型的SQL语句：
阅读更多：MySQL 教程
SELECT语句
示例
mysql> PREPARE stmt FROM 'SELECT tender_value from Tender WHERE
Companyname = ?';
Query OK, 0 rows affected (0.09 sec)
Statement prepared
mysql> SET @A = 'Singla Group.';
Query OK, 0 rows affected (0.00 sec)
mysql> EXECUTE stmt using @A;
+--------------+
| tender_value |
+--------------+
| 220.255997 |
+--------------+
1 row in set (0.07 sec)
mysql> DEALLOCATE PREPARE stmt;
Query OK, 0 rows affected (0.00 sec)
INSERT、REPLACE、UPDATE和DELETE
修改数据的语句。
示例
mysql> PREPARE stmt1 FROM 'DELETE from Tender WHERE Sr = ?';
Query OK, 0 rows affected (0.00 sec)
Statement prepared
mysql> SET @A = 4;
Query OK, 0 rows affected (0.00 sec)
mysql> EXECUTE stmt1;
ERROR 1210 (HY000): Unknown error 1210
mysql> EXECUTE stmt1 using @A;
Query OK, 1 row affected (0.08 sec)
mysql> DEALLOCATE PREPARE stmt1;
Query OK, 0 rows affected (0.00 sec)
mysql> Select * from tender;
+----+---------------+--------------+
| Sr | CompanyName | Tender_value |
+----+---------------+--------------+
| 1 | Abc Corp. | 250.369003 |
| 2 | Khaitan Corp. | 265.588989 |
| 3 | Singla group. | 220.255997 |
+----+---------------+--------------+
3 rows in set (0.00 sec)
CREATE TABLE语句。
示例
mysql> PREPARE stmt3 FROM 'CREATE TABLE Student(Id INT, Name
Varchar(20))';
Query OK, 0 rows affected (0.00 sec)
Statement prepared
mysql> EXECUTE stmt3;
Query OK, 0 rows affected (0.73 sec)
mysql> DEALLOCATE PREPARE stmt3;
Query OK, 0 rows affected (0.00 sec)
SET、DO及许多SHOW语句
示例
mysql> PREPARE stmt10 FROM 'SHOW TABLES';
Query OK, 0 rows affected (0.00 sec)
Statement prepared
mysql> EXECUTE stmt10;
+-------------------+
| Tables_in_query |
+-------------------+
| emp |
| emp123 |
| emp_t |
| examination_btech |
| new_number |
| student |
| student_detail |
| student_info |
| tender |
| website |
+-------------------+
10 rows in set (0.00 sec)