Sqlite3支持的數據類型
NULL，INTEGER，REAL，TEXT，BLOB
smallint 16 位元的整數。
interger 32 位元的整數。
decimal(p,s) p 精確值和 s 大小的十進位整數，精確值p是指全部有幾個數(digits)大小值，s是指小數點後有幾位數。如果沒有特別指定，則系統會設爲 p=5; s=0 。
float 32位元的實數。
double 64位元的實數。
char(n) n 長度的字串，n不能超過 254。
varchar(n) 長度不固定且其最大長度爲 n 的字串，n不能超過 4000。
graphic(n) 和 char(n) 一樣，不過其單位是兩個字元 double-bytes， n不能超過127。這個形態是爲了支援兩個字元長度的字體，例如中文字。
vargraphic(n) 可變長度且其最大長度爲 n 的雙字元字串，n不能超過 2000
date 包含了 年份、月份、日期。
time 包含了 小時、分鐘、秒。
timestamp 包含了 年、月、日、時、分、秒、千分之一秒。
參考：
| type | description |
|---|---|
| TINYBLOB, BLOB, MEDIUMBLOB, LONGBLOB, BYTEA | String types of unlimited length. Binary data must be safely encoded, see text. |
| CHAR(), VARCHAR(), TINYTEXT, TEXT, MEDIUMTEXT, LONGTEXT | String types of unlimited length. There is no chopping or padding performed by the database engine. |
| ENUM | String type of unlimited length. In contrast to MySQL, choosing ENUM over VARCHAR does not save any storage space. |
| SET | String type of unlimited length. In contrast to MySQL, the input is not checked against the list of allowed values. |
| YEAR | String type of unlimited length. MySQL stores 2 or 4 digit years as a 1 byte value, whereas the SQLite drivers stores the string as provided. |
| TINYINT, INT1, CHAR | A 1 byte type used to store one character, a signed integer between -128 and 127, or an unsigned integer between 0 and 255. |
| SMALLINT, INT2 | 2 byte (short) integer type used to store a signed integer between -32768 and 32767 or an unsigned integer between 0 and 65535. |
| MEDIUMINT | 3 byte integer type used to store a signed integer between -8388608 and 8388607 or an unsigned integer between 0 and 16777215. |
| INT, INTEGER, INT4 | 4 byte (long) integer type used to store a signed integer between -2147483648 and 2147483647 or an unsigned integer between 0 and 4294967295. |
| BIGINT, INT8, INTEGER PRIMARY KEY | 8 byte (long long) integer type used to store a signed integer between -9223372036854775808 and 9223372036854775807 or an unsigned integer between 0 and 18446744073709551615. See below for a discussion of INTEGER PRIMARY KEY. |
| DECIMAL, NUMERIC | A string type of unlimited length used to store floating-point numbers of arbitrary precision. |
| TIMESTAMP, DATETIME | A string type of unlimited length used to store date/time combinations. The required format is 'YYYY-MM-DD HH:MM:SS', anything following this pattern is ignored. |
| DATE | A string type of unlimited length used to store a date. The required format is 'YYYY-MM-DD', anything following this pattern is ignored. |
| TIME | A string type of unlimited length used to store a time. The required format is 'HH:MM:SS', anything following this pattern is ignored. |
| FLOAT, FLOAT4, REAL | A 4 byte floating-point number. The range is -3.402823466E+38 to -1.175494351E-38, 0, and 1.175494351E-38 to 3.402823466E+38. Please note that MySQL treats REAL as an 8 byte instead of a 4 byte float like PostgreSQL. |
| DOUBLE, DOUBLE PRECISION, FLOAT8 | An 8 byte floating-point number. The range is -1.7976931348623157E+308 to -2.2250738585072014E-308, 0, and 2.2250738585072014E-308 to 1.7976931348623157E+308. |