- bigint類型轉換爲datetime類型
-
-- 假設 1164691264437 是 Java 裏的“日期時間”:即:自1970-01-01 00:00:00以來的毫秒數
-
/*
-
getTime
-
public long getTime()Returns the number of milliseconds since January 1, 1970, 00:00:00 GMT represented by this Date object.
-
-
Returns:
-
the number of milliseconds since January 1, 1970, 00:00:00 GMT represented by this date.
-
*/
-
mysql> select from_unixtime(1164691264437/1000);
-
+-----------------------------------+
-
| from_unixtime(1164691264437/1000) |
-
+-----------------------------------+
-
| 2006-11-28 13:21:04 |
- +-----------------------------------+
2、datetime類型轉換爲bigint類型
-
-- 假設 "2011-05-31 23:59:59" 是 Java 裏的“日期時間”:即:自1970-01-01 00:00:00以來的毫秒數
-
-
-
mysql> select UNIX_TIMESTAMP('2011-05-31 23:59:59');
-
+-----------------------------------+
-
| from_unixtime(1306857599/1000) |
-
+-----------------------------------+ |
2、將varchar 轉爲Int 用 cast(a as signed) a爲varchar類型的字符串
as 後 可跟參數:
二進制,同帶binary前綴的效果 : BINARY
字符型,可帶參數 : CHAR()
日期 : DATE
時間: TIME
日期時間型 : DATETIME
浮點數 : DECIMAL
整數 : SIGNED
無符號整數 : UNSIGNED