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使用下以两种方法时必须把字段设为”主键(PRIMARY KEY”或”唯一约束(UNIQUE)”。
1:使用REPLACE INTO (此种方法是利用替换的方法,有点似类于先删除再插入)
REPLACE INTO Syntax
REPLACE [LOW_PRIORITY | DELAYED]
[INTO] tbl_name [(col_name,...)]
{VALUES | VALUE} ({expr | DEFAULT},…),(…),…
Or:
REPLACE [LOW_PRIORITY | DELAYED]
[INTO] tbl_name
SET col_name={expr | DEFAULT}, …
Or:
REPLACE [LOW_PRIORITY | DELAYED]
[INTO] tbl_name [(col_name,...)]
SELECT …
2:使用INSERT [IGNORE] INTO (此种方法效率比较高,判断是否存在,存在不插入,否则插入)
INSERT [IGNORE] INTO Syntax
INSERT [LOW_PRIORITY | DELAYED | HIGH_PRIORITY] [IGNORE]
[INTO] tbl_name [(col_name,...)]
{VALUES | VALUE} ({expr [...]