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