[转]SQLite 经验集
SQLite 的默认时间 转自:http://www.cnblogs.com/pennant/archive/2011/08/11/2134897.html
select strftime('%Y-%m-%d %H:%M:%S','now')
这个查询的结果是 UTC时间,即 +8h 才和电脑时间相同。
select time('now')
这个查询的结果是 01:02:03 ,也要 +8h 才和电脑时间相同。
select date('now')
这个查询的结果是 2017-03-02
select datetime('now')
这个查询的结果是 2017-03-02 01:02:03
%d 一月中的第几天01-31 %f 小数形式的秒,SS.SSSS %H 小时00-24 %j 一年中的第几天01-366 %J Julian Day Numbers %m 月份01-12 %M 分钟00-59 %s 从1970-01-01日开始计算的秒数 %S 秒00-59 %w 星期,0-6,0是星期天 %W 一年中的第几周00-53 %Y 年份0000-9999 %% %百分号
SQLite: Data Types - 数据类型
The following is a list of datatypes available in SQLite, which includes string, numeric, date/time, and large object datatypes.
For simplicity's sake, SQLite essentially uses these basic datatypes:
- TEXT
- INTEGER
- NUMERIC
- REAL
- NONE
To be compatible with other SQL databases, SQLite allows you to use the common datatype names that you've seen in other databases and maps them to their basic SQLite datatypes (listed above).
Let's look at the common datatypes names that SQLite lets you define.
String Datatypes
All string datatypes in SQLite are converted to a TEXT datatype. If you try to specify a size for a string datatype, SQLite will ignore it, as it does not allow size restrictions on string datatypes.
The following are the String Datatypes in SQLite:
Data Type Syntax | Explanation |
---|---|
CHAR(size) | Equivalent to TEXT (size is ignored) |
VARCHAR(size) | Equivalent to TEXT (size is ignored) |
TINYTEXT(size) | Equivalent to TEXT (size is ignored) |
TEXT(size) | Equivalent to TEXT (size is ignored) |
MEDIUMTEXT(size) | Equivalent to TEXT (size is ignored) |
LONGTEXT(size) | Equivalent to TEXT (size is ignored) |
NCHAR(size) | Equivalent to TEXT (size is ignored) |
NVARCHAR(size) | Equivalent to TEXT (size is ignored) |
CLOB(size) | Equivalent to TEXT (size is ignored) |
Numeric Datatypes
All numeric datatypes in SQLite are converted to INTEGER, NUMERIC, or REAL datatypes.
The following are the Numeric Datatypes in SQLite:
Data Type Syntax | Explanation |
---|---|
TINYINT | Equivalent to INTEGER |
SMALLINT | Equivalent to INTEGER |
MEDIUMINT | Equivalent to INTEGER |
INT | Equivalent to INTEGER |
INTEGER | Equivalent to INTEGER |
BIGINT | Equivalent to INTEGER |
INT2 | Equivalent to INTEGER |
INT4 | Equivalent to INTEGER |
INT8 | Equivalent to INTEGER |
NUMERIC | Equivalent to NUMERIC |
DECIMAL | Equivalent to NUMERIC |
REAL | Equivalent to REAL |
DOUBLE | Equivalent to REAL |
DOUBLE PRECISION | Equivalent to REAL |
FLOAT | Equivalent to REAL |
BOOLEAN | Equivalent to NUMERIC |
Date/Time Datatypes
All date or time datatypes in SQLite are converted to NUMERIC datatypes.
The following are the Date/Time Datatypes in SQLite:
Data Type Syntax | Explanation |
---|---|
DATE | Equivalent to NUMERIC |
DATETIME | Equivalent to NUMERIC |
TIMESTAMP | Equivalent to NUMERIC |
TIME | Equivalent to NUMERIC |
Large Object (LOB) Datatypes
The following are the LOB Datatypes in SQLite:
Data Type Syntax | Explanation |
---|---|
BLOB | Equivalent to NONE |
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