mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-25 09:02:00 +00:00
39 lines
1.4 KiB
Markdown
39 lines
1.4 KiB
Markdown
# clickhouse-odbc-bridge
|
|
|
|
Simple HTTP-server which works like a proxy for ODBC driver. The main motivation
|
|
was possible segfaults or another faults in ODBC implementations, which can
|
|
crash whole clickhouse-server process.
|
|
|
|
This tool works via HTTP, not via pipes, shared memory, or TCP because:
|
|
- It's simpler to implement
|
|
- It's simpler to debug
|
|
- jdbc-bridge can be implemented in the same way
|
|
|
|
## Usage
|
|
|
|
`clickhouse-server` use this tool inside odbc table function and StorageODBC.
|
|
However it can be used as standalone tool from command line with the following
|
|
parameters in POST-request URL:
|
|
- `connection_string` -- ODBC connection string.
|
|
- `columns` -- columns in ClickHouse NamesAndTypesList format, name in backticks,
|
|
type as string. Name and type are space separated, rows separated with
|
|
newline.
|
|
- `max_block_size` -- optional parameter, sets maximum size of single block.
|
|
Query is send in post body. Response is returned in RowBinary format.
|
|
|
|
## Example:
|
|
|
|
```bash
|
|
$ clickhouse-odbc-bridge --http-port 9018 --daemon
|
|
|
|
$ curl -d "query=SELECT PageID, ImpID, AdType FROM Keys ORDER BY PageID, ImpID" --data-urlencode "connection_string=DSN=ClickHouse;DATABASE=stat" --data-urlencode "columns=columns format version: 1
|
|
3 columns:
|
|
\`PageID\` String
|
|
\`ImpID\` String
|
|
\`AdType\` String
|
|
" "http://localhost:9018/" > result.txt
|
|
|
|
$ cat result.txt # Result in RowBinary format
|
|
12246623837185725195925621517
|
|
```
|