本篇内容主要讲解“数据库SQLite的语法介绍和使用”,感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷,实用性强。下面就让小编来带大家学习“数据库SQLite的语法介绍和使用”吧!
SQLite
概述
SQLite是一个进程内的库,实现了自给自足的、无服务器的、零配置的、事务性的 SQL 数据库引擎。它是一个零配置的数据库,这意味着与其它数据库不同,不需要在系统中配置。 就像其它数据库,SQLite引擎不是一个独立的进程,可以按应用程序需求进行静态或动态连接。SQLite直接访问其存储文件。
SQLite语法
语法是一组独特的规则和约定。 以下是SQLite的语法列表。
区分大小写:
SQLite不区分大小写。但是,有一些区分大小写的命令。例如:GLOB和glob在SQLite语句中有不同的含义。
注释:
注释用于在SQLite代码中增加代码的可读性。
注释不能嵌套。
注释以两个连续的“ - ”字符。
也可使用“/”字符开始,并延伸至下一个“/”字符对所包括的内容视为注释。
SQLite语句
所有的SQLite语句都是以关键字(如:SELECT,INSERT,UPDATE,DELETE,ALTER,DROP等)开始的。所有语句都以分号(;)结尾。
SQLite ANALYZE语句的语法:
ANALYZE; -- or ANALYZE database_name; -- or ANALYZE database_name.table_name;
SQLite AND/OR子句的语法:
SELECT column1, column2....columnN FROM table_name WHERE CONDITION-1 {AND|OR} CONDITION-2;
SQLite ALTER TABLE语句的语法
ALTER TABLE table_name ADD COLUMN column_def...;
SQLite ALTER TABLE语句(Rename)语句的语法
ALTER TABLE table_name RENAME TO new_table_name;
SQLite ATTACH DATABASE语句的语法:
ATTACH DATABASE 'DatabaseName' As 'Alias-Name';
SQLite BEGIN TRANSACTION语句的语法:
BEGIN; -- or BEGIN EXCLUSIVE TRANSACTION;
SQLite BETWEEN语句的语法:
SELECT column1, column2....columnN FROM table_name WHERE column_name BETWEEN val-1 AND val-2; SQLite COMMIT Statement: COMMIT;
SQLite CREATE INDEX语句的语法:
CREATE INDEX index_name ON table_name ( column_name COLLATE NOCASE );
SQLite CREATE UNIQUE INDEX语句的语法:
CREATE UNIQUE INDEX index_name ON table_name ( column1, column2,...columnN);
SQLite CREATE TABLE语句的语法:
CREATE TABLE table_name( column1 datatype, column2 datatype, column3 datatype, ..... columnN datatype, PRIMARY KEY( one or more columns ));
SQLite CREATE TRIGGER语句的语法:
CREATE TRIGGER database_name.trigger_name BEFORE INSERT ON table_name FOR EACH ROW BEGIN stmt1; stmt2; .... END;
SQLite CREATE VIEW语句的语法:
CREATE VIEW database_name.view_name AS SELECT statement....;
SQLite CREATE VIRTUAL TABLE语句的语法:
CREATE VIRTUAL TABLE database_name.table_name USING weblog( access.log ); -- or CREATE VIRTUAL TABLE database_name.table_name USING fts3( );
SQLite COMMIT TRANSACTION语句的语法:
COMMIT;
SQLite COUNT语句的语法:
SELECT COUNT(column_name) FROM table_name WHERE CONDITION;
SQLite DELETE语句的语法:
DELETE FROM table_name WHERE {CONDITION};
SQLite DETACH DATABASE语句的语法:
DETACH DATABASE 'Alias-Name';
SQLite DISTINCT语句的语法:
SELECT DISTINCT column1, column2....columnN FROM table_name;
SQLite DROP INDEX语句的语法:
DROP INDEX database_name.index_name;
SQLite DROP TABLE语句的语法:
DROP TABLE database_name.table_name;
SQLite DROP VIEW语句的语法:
DROP INDEX database_name.view_name;
SQLite DROP TRIGGER 语句的语法:
DROP INDEX database_name.trigger_name;
SQLite EXISTS语句的语法:
SELECT column1, column2....columnN FROM table_name WHERE column_name EXISTS (SELECT * FROM table_name );
SQLite EXPLAIN语句的语法:
EXPLAIN INSERT statement...; -- or EXPLAIN QUERY PLAN SELECT statement...;
SQLite GLOB语句的语法:
SELECT column1, column2....columnN FROM table_name WHERE column_name GLOB { PATTERN };
SQLite GROUP BY语句的语法:
SELECT SUM(column_name) FROM table_name WHERE CONDITION GROUP BY column_name;
SQLite HAVING语句的语法:
SELECT SUM(column_name) FROM table_name WHERE CONDITION GROUP BY column_name HAVING (arithematic function condition);
SQLite INSERT INTO语句的语法:
INSERT INTO table_name( column1, column2....columnN) VALUES ( value1, value2....valueN);
SQLite IN语句的语法:
SELECT column1, column2....columnN FROM table_name WHERE column_name IN (val-1, val-2,...val-N);
SQLite Like语句的语法:
SELECT column1, column2....columnN FROM table_name WHERE column_name LIKE { PATTERN };
SQLite NOT IN语句的语法:
SELECT column1, column2....columnN FROM table_name WHERE column_name NOT IN (val-1, val-2,...val-N);
SQLite ORDER BY语句的语法:
SELECT column1, column2....columnN FROM table_name WHERE CONDITION ORDER BY column_name {ASC|DESC};
SQLite PRAGMA语句的语法:
PRAGMA pragma_name;
有关pragma的几个示例:
PRAGMA page_size; PRAGMA cache_size = 1024; PRAGMA table_info(table_name);
SQLite RELEASE SAVEPOINT语句的语法:
RELEASE savepoint_name;
SQLite REINDEX语句的语法:
REINDEX collation_name; REINDEX database_name.index_name; REINDEX database_name.table_name;
SQLite ROLLBACK语句的语法:
ROLLBACK; -- or ROLLBACK TO SAVEPOINT savepoint_name;
SQLite SAVEPOINT语句的语法:
SAVEPOINT savepoint_name;
SQLite SELECT语句的语法:
SELECT column1, column2....columnN FROM table_name;
SQLite UPDATE语句的语法:
UPDATE table_name SET column1 = value1, column2 = value2....columnN=valueN [ WHERE CONDITION ];
SQLite VACUUM语句的语法:
VACUUM; SQLite WHERE Clause: SELECT column1, column2....columnN FROM table_name WHERE CONDITION;
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