ClickHouse
ToolJet can connect to the ClickHouse to read and write data.
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ToolJet uses this NodeJS client for ClickHouse.
Connection
To establish a connection with the Clickhouse data source, you can either click on the + Add new data source button located on the query panel or navigate to the Data Sources page through the ToolJet dashboard.
ToolJet requires the following to connect to your ClickHouse Database:
- Username
- Password
- Host
- Port
- Database Name
- Protocol
- Use Post
- Trim Query
- Use Gzip
- Debug
- Raw
Querying ClickHouse
- Click on + Add button of the query manager at the bottom panel of the editor.
- Select the ClickHouse datasource added in previous step.
- Select the operation you want to perform and enter the query.
- Click on the Preview button to preview the output or Click on the Run button to create and trigger the query.
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For more details on clickhouse visit Clickhouse Docs.
Supported Operations
SQL Query
Use this to operation to enter ClickHouse SQL Statements. These statements represent various kinds of action you can perform using SQL queries.
Example SQL queries
SELECT:
SELECT * from test array;
CREATE:
CREATE TABLE test array3 (
date Date,
str String,
arr Array(String),
arr2 Array (Date)
arr3 Array(UInt32) ,
id1 UUID
)ENGINE=MergeTree () ORDER BY(str)
ALTER TABLE (add column)
ALTER TABLE test array1 ADD COLUMN Added2 UInt32;
SELECT WITH WHERE CLAUSE
SELECT * FROM test array1 WHERE str='Somethingl...'
UPDATE
ALTER TABLE test_array1 UPDATE arr = (12] WHERE str='Somethingl...'
DELETE
ALTER TABLE test_array1 DELETE WHERE str= 'Somethingl...'
NORMAL INSERT
Step 1 - Creating Table
CREATE TABLE test array4 (
name String,
date Date
)ENGINE=MergeTree () ORDER BY (name)
Step 2 - Insert
INSERT INTO test_array4 (*) VALUES ('juvane', '1996-01-13')
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Giving Primary Key
CREATE TABLE db.table_name
(
name1 type1, name2 type2, ...,
PRIMARY KEY(expr1[, expr2,...])]
)
ENGINE = engine;
OR
CREATE TABLE db.table_name
(
name1 type1, name2 type2, ...
)
ENGINE = engine
PRIMARY KEY(expr1[, expr2,...]);
Insert Array of Objects
Use this operation for inserting array of objects.
Required Parameters:
- Body
- Table name
- Fields
Example Body value:
[
{ "id": 1, "name": "Alice", "age": 25 },
{ "id": 2, "name": "Bob", "age": 30 },
{ "id": 3, "name": "Charlie", "age": 28 }
]