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本篇內容主要講解“數據庫SQLite的語法介紹和使用”,感興趣的朋友不妨來看看。本文介紹的方法操作簡單快捷,實用性強。下面就讓小編來帶大家學習“數據庫SQLite的語法介紹和使用”吧!
SQLite
概述
SQLite是一個進程內的庫,實現了自給自足的、無服務器的、零配置的、事務性的 SQL 數據庫引擎。它是一個零配置的數據庫,這意味著與其它數據庫不同,不需要在系統中配置。 就像其它數據庫,SQLite引擎不是一個獨立的進程,可以按應用程序需求進行靜態或動態連接。SQLite直接訪問其存儲文件。
SQLite語法
語法是一組獨特的規則和約定。 以下是SQLite的語法列表。
區分大小寫:
SQLite不區分大小寫。但是,有一些區分大小寫的命令。例如:GLOB和glob在SQLite語句中有不同的含義。
注釋:
注釋用于在SQLite代碼中增加代碼的可讀性。
注釋不能嵌套。
注釋以兩個連續的“ - ”字符。
也可使用“/”字符開始,并延伸至下一個“/”字符對所包括的內容視為注釋。
SQLite語句
所有的SQLite語句都是以關鍵字(如:SELECT,INSERT,UPDATE,DELETE,ALTER,DROP等)開始的。所有語句都以分號(;)結尾。
SQLite ANALYZE語句的語法:
ANALYZE; -- or ANALYZE database_name; -- or ANALYZE database_name.table_name;
SQLite AND/OR子句的語法:
SELECT column1, column2....columnN FROM table_name WHERE CONDITION-1 {AND|OR} CONDITION-2;
SQLite ALTER TABLE語句的語法
ALTER TABLE table_name ADD COLUMN column_def...;
SQLite ALTER TABLE語句(Rename)語句的語法
ALTER TABLE table_name RENAME TO new_table_name;
SQLite ATTACH DATABASE語句的語法:
ATTACH DATABASE 'DatabaseName' As 'Alias-Name';
SQLite BEGIN TRANSACTION語句的語法:
BEGIN; -- or BEGIN EXCLUSIVE TRANSACTION;
SQLite BETWEEN語句的語法:
SELECT column1, column2....columnN FROM table_name WHERE column_name BETWEEN val-1 AND val-2; SQLite COMMIT Statement: COMMIT;
SQLite CREATE INDEX語句的語法:
CREATE INDEX index_name ON table_name ( column_name COLLATE NOCASE );
SQLite CREATE UNIQUE INDEX語句的語法:
CREATE UNIQUE INDEX index_name ON table_name ( column1, column2,...columnN);
SQLite CREATE TABLE語句的語法:
CREATE TABLE table_name( column1 datatype, column2 datatype, column3 datatype, ..... columnN datatype, PRIMARY KEY( one or more columns ));
SQLite CREATE TRIGGER語句的語法:
CREATE TRIGGER database_name.trigger_name BEFORE INSERT ON table_name FOR EACH ROW BEGIN stmt1; stmt2; .... END;
SQLite CREATE VIEW語句的語法:
CREATE VIEW database_name.view_name AS SELECT statement....;
SQLite CREATE VIRTUAL TABLE語句的語法:
CREATE VIRTUAL TABLE database_name.table_name USING weblog( access.log ); -- or CREATE VIRTUAL TABLE database_name.table_name USING fts3( );
SQLite COMMIT TRANSACTION語句的語法:
COMMIT;
SQLite COUNT語句的語法:
SELECT COUNT(column_name) FROM table_name WHERE CONDITION;
SQLite DELETE語句的語法:
DELETE FROM table_name WHERE {CONDITION};
SQLite DETACH DATABASE語句的語法:
DETACH DATABASE 'Alias-Name';
SQLite DISTINCT語句的語法:
SELECT DISTINCT column1, column2....columnN FROM table_name;
SQLite DROP INDEX語句的語法:
DROP INDEX database_name.index_name;
SQLite DROP TABLE語句的語法:
DROP TABLE database_name.table_name;
SQLite DROP VIEW語句的語法:
DROP INDEX database_name.view_name;
SQLite DROP TRIGGER 語句的語法:
DROP INDEX database_name.trigger_name;
SQLite EXISTS語句的語法:
SELECT column1, column2....columnN FROM table_name WHERE column_name EXISTS (SELECT * FROM table_name );
SQLite EXPLAIN語句的語法:
EXPLAIN INSERT statement...; -- or EXPLAIN QUERY PLAN SELECT statement...;
SQLite GLOB語句的語法:
SELECT column1, column2....columnN FROM table_name WHERE column_name GLOB { PATTERN };
SQLite GROUP BY語句的語法:
SELECT SUM(column_name) FROM table_name WHERE CONDITION GROUP BY column_name;
SQLite HAVING語句的語法:
SELECT SUM(column_name) FROM table_name WHERE CONDITION GROUP BY column_name HAVING (arithematic function condition);
SQLite INSERT INTO語句的語法:
INSERT INTO table_name( column1, column2....columnN) VALUES ( value1, value2....valueN);
SQLite IN語句的語法:
SELECT column1, column2....columnN FROM table_name WHERE column_name IN (val-1, val-2,...val-N);
SQLite Like語句的語法:
SELECT column1, column2....columnN FROM table_name WHERE column_name LIKE { PATTERN };
SQLite NOT IN語句的語法:
SELECT column1, column2....columnN FROM table_name WHERE column_name NOT IN (val-1, val-2,...val-N);
SQLite ORDER BY語句的語法:
SELECT column1, column2....columnN FROM table_name WHERE CONDITION ORDER BY column_name {ASC|DESC};
SQLite PRAGMA語句的語法:
PRAGMA pragma_name;
有關pragma的幾個示例:
PRAGMA page_size; PRAGMA cache_size = 1024; PRAGMA table_info(table_name);
SQLite RELEASE SAVEPOINT語句的語法:
RELEASE savepoint_name;
SQLite REINDEX語句的語法:
REINDEX collation_name; REINDEX database_name.index_name; REINDEX database_name.table_name;
SQLite ROLLBACK語句的語法:
ROLLBACK; -- or ROLLBACK TO SAVEPOINT savepoint_name;
SQLite SAVEPOINT語句的語法:
SAVEPOINT savepoint_name;
SQLite SELECT語句的語法:
SELECT column1, column2....columnN FROM table_name;
SQLite UPDATE語句的語法:
UPDATE table_name SET column1 = value1, column2 = value2....columnN=valueN [ WHERE CONDITION ];
SQLite VACUUM語句的語法:
VACUUM; SQLite WHERE Clause: SELECT column1, column2....columnN FROM table_name WHERE CONDITION;
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