mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-15 12:14:18 +00:00
81 lines
2.3 KiB
Markdown
81 lines
2.3 KiB
Markdown
---
|
||
toc_priority: 32
|
||
toc_title: SQLite
|
||
---
|
||
|
||
# SQLite {#sqlite}
|
||
|
||
允许连接到[SQLite](https://www.sqlite.org/index.html)数据库，并支持ClickHouse和SQLite交换数据， 执行 `INSERT` 和 `SELECT` 查询。
|
||
|
||
## 创建一个数据库 {#creating-a-database}
|
||
|
||
``` sql
|
||
CREATE DATABASE sqlite_database
|
||
ENGINE = SQLite('db_path')
|
||
```
|
||
|
||
**引擎参数**
|
||
|
||
- `db_path` — SQLite 数据库文件的路径.
|
||
|
||
## 数据类型的支持 {#data_types-support}
|
||
|
||
| SQLite | ClickHouse |
|
||
|---------------|---------------------------------------------------------|
|
||
| INTEGER | [Int32](../../sql-reference/data-types/int-uint.md) |
|
||
| REAL | [Float32](../../sql-reference/data-types/float.md) |
|
||
| TEXT | [String](../../sql-reference/data-types/string.md) |
|
||
| BLOB | [String](../../sql-reference/data-types/string.md) |
|
||
|
||
## 技术细节和建议 {#specifics-and-recommendations}
|
||
|
||
SQLite将整个数据库(定义、表、索引和数据本身)存储为主机上的单个跨平台文件。在写入过程中，SQLite会锁定整个数据库文件，因此写入操作是顺序执行的。读操作可以是多任务的。
|
||
SQLite不需要服务管理(如启动脚本)或基于“GRANT”和密码的访问控制。访问控制是通过授予数据库文件本身的文件系统权限来处理的。
|
||
|
||
## 使用示例 {#usage-example}
|
||
|
||
数据库在ClickHouse，连接到SQLite:
|
||
|
||
``` sql
|
||
CREATE DATABASE sqlite_db ENGINE = SQLite('sqlite.db');
|
||
SHOW TABLES FROM sqlite_db;
|
||
```
|
||
|
||
``` text
|
||
┌──name───┐
|
||
│ table1 │
|
||
│ table2 │
|
||
└─────────┘
|
||
```
|
||
|
||
展示数据表中的内容:
|
||
|
||
``` sql
|
||
SELECT * FROM sqlite_db.table1;
|
||
```
|
||
|
||
``` text
|
||
┌─col1──┬─col2─┐
|
||
│ line1 │ 1 │
|
||
│ line2 │ 2 │
|
||
│ line3 │ 3 │
|
||
└───────┴──────┘
|
||
```
|
||
从ClickHouse表插入数据到SQLite表:
|
||
|
||
``` sql
|
||
CREATE TABLE clickhouse_table(`col1` String,`col2` Int16) ENGINE = MergeTree() ORDER BY col2;
|
||
INSERT INTO clickhouse_table VALUES ('text',10);
|
||
INSERT INTO sqlite_db.table1 SELECT * FROM clickhouse_table;
|
||
SELECT * FROM sqlite_db.table1;
|
||
```
|
||
|
||
``` text
|
||
┌─col1──┬─col2─┐
|
||
│ line1 │ 1 │
|
||
│ line2 │ 2 │
|
||
│ line3 │ 3 │
|
||
│ text │ 10 │
|
||
└───────┴──────┘
|
||
```
|