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| .. | ||
| tests | ||
| CMakeLists.txt | ||
| ColumnInfoHandler.cpp | ||
| ColumnInfoHandler.h | ||
| getIdentifierQuote.cpp | ||
| getIdentifierQuote.h | ||
| HandlerFactory.cpp | ||
| HandlerFactory.h | ||
| IdentifierQuoteHandler.cpp | ||
| IdentifierQuoteHandler.h | ||
| MainHandler.cpp | ||
| MainHandler.h | ||
| odbc-bridge.cpp | ||
| ODBCBlockInputStream.cpp | ||
| ODBCBlockInputStream.h | ||
| ODBCBridge.cpp | ||
| ODBCBridge.h | ||
| PingHandler.cpp | ||
| PingHandler.h | ||
| README.md | ||
| validateODBCConnectionString.cpp | ||
| validateODBCConnectionString.h | ||
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:
$ 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
12246623837185725195925621517