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SQLite

Allows to connect to SQLite database and perform INSERT and SELECT queries to exchange data between ClickHouse and SQLite.

Creating a database​

    CREATE DATABASE sqlite_database
    ENGINE = SQLite('db_path')

Engine Parameters

  • db_path — Path to a file with SQLite database.

Data types support​

SQLiteClickHouse
INTEGERInt32
REALFloat32
TEXTString
BLOBString

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 multi-tasked. 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​

Database in ClickHouse, connected to the SQLite:

CREATE DATABASE sqlite_db ENGINE = SQLite('sqlite.db');
SHOW TABLES FROM sqlite_db;

┌──name───┐
│ table1  │
│ table2  │
└─────────┘

Shows the tables:

SELECT * FROM sqlite_db.table1;

┌─col1──┬─col2─┐
│ line1 │    1 │
│ line2 │    2 │
│ line3 │    3 │
└───────┴──────┘

Inserting data into SQLite table from ClickHouse table:

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;

┌─col1──┬─col2─┐
│ line1 │    1 │
│ line2 │    2 │
│ line3 │    3 │
│ text  │   10 │
└───────┴──────┘