mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-14 03:25:15 +00:00
81 lines
2.5 KiB
Markdown
81 lines
2.5 KiB
Markdown
---
|
|
toc_priority: 32
|
|
toc_title: SQLite
|
|
---
|
|
|
|
# SQLite {#sqlite}
|
|
|
|
Allows to connect to [SQLite](https://www.sqlite.org/index.html) database and perform `INSERT` and `SELECT` queries to exchange data between ClickHouse and SQLite.
|
|
|
|
## Creating a Database {#creating-a-database}
|
|
|
|
``` sql
|
|
CREATE DATABASE sqlite_database
|
|
ENGINE = SQLite('db_path')
|
|
```
|
|
|
|
**Engine Parameters**
|
|
|
|
- `db_path` — Path to a file with SQLite database.
|
|
|
|
## Data Types Support {#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) |
|
|
|
|
## Specifics and Recommendations {#specifics-and-recommendations}
|
|
|
|
SQLite stores the entire database (definitions, tables, indices, and the data itself) as a single cross-platform file on a host machine. During writing SQLite locks the entire database file, therefore write operations are performed sequentially. Read operations can be multitasked.
|
|
SQLite does not require service management (such as startup scripts) or access control based on `GRANT` and passwords. Access control is handled by means of file-system permissions given to the database file itself.
|
|
|
|
## Usage Example {#usage-example}
|
|
|
|
Database in ClickHouse, connected to the SQLite:
|
|
|
|
``` sql
|
|
CREATE DATABASE sqlite_db ENGINE = SQLite('sqlite.db');
|
|
SHOW TABLES FROM sqlite_db;
|
|
```
|
|
|
|
``` text
|
|
┌──name───┐
|
|
│ table1 │
|
|
│ table2 │
|
|
└─────────┘
|
|
```
|
|
|
|
Shows the tables:
|
|
|
|
``` sql
|
|
SELECT * FROM sqlite_db.table1;
|
|
```
|
|
|
|
``` text
|
|
┌─col1──┬─col2─┐
|
|
│ line1 │ 1 │
|
|
│ line2 │ 2 │
|
|
│ line3 │ 3 │
|
|
└───────┴──────┘
|
|
```
|
|
Inserting data into SQLite table from ClickHouse table:
|
|
|
|
``` 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 │
|
|
└───────┴──────┘
|
|
```
|