| 1 | mysql扩展 | (注：原始的，较差) |
| 2 | mysqli扩展(面向过程式) | (注：比上面多了更多功能) |
| 3 | mysqli扩展(面向对象式) | (注：比上面更符合面向对象思想) |
| 4 | mysqli扩展(面向对象式)(准备语句) | (注：比上面更性能和安全) |
| 5 | PDO | (注：比上面更具跨数据库的移植性) |
| 6 | PDO(准备语句) | (注：比上面更性能和安全) |
推荐由下往上优先使用。
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