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#include "StorageSQLite.h"
#if USE_SQLITE
#include <Common/logger_useful.h>
#include <Processors/Sources/SQLiteSource.h>
#error #include <Databases/SQLite/SQLiteUtils.h>
#error #include <Databases/SQLite/fetchSQLiteTableStructure.h>
#include <DataTypes/DataTypeString.h>
#include <Formats/FormatFactory.h>
#include <Processors/Formats/IOutputFormat.h>
#include <IO/Operators.h>
#include <IO/WriteHelpers.h>
#include <Interpreters/evaluateConstantExpression.h>
#include <Parsers/ASTLiteral.h>
#include <Processors/Sinks/SinkToStorage.h>
#include <Storages/StorageFactory.h>
#include <Storages/transformQueryForExternalDatabase.h>
#include <Storages/checkAndGetLiteralArgument.h>
#include <QueryPipeline/Pipe.h>
#include <Common/filesystemHelpers.h>
namespace DB
{
namespace ErrorCodes
{
extern const int NUMBER_OF_ARGUMENTS_DOESNT_MATCH;
extern const int SQLITE_ENGINE_ERROR;
}
StorageSQLite::StorageSQLite(
const StorageID & table_id_,
SQLitePtr sqlite_db_,
const String & database_path_,
const String & remote_table_name_,
const ColumnsDescription & columns_,
const ConstraintsDescription & constraints_,
ContextPtr context_)
: IStorage(table_id_)
, WithContext(context_->getGlobalContext())
, remote_table_name(remote_table_name_)
, database_path(database_path_)
, sqlite_db(sqlite_db_)
, log(&Poco::Logger::get("StorageSQLite (" + table_id_.table_name + ")"))
{
StorageInMemoryMetadata storage_metadata;
if (columns_.empty())
{
auto columns = getTableStructureFromData(sqlite_db, remote_table_name);
storage_metadata.setColumns(columns);
}
else
storage_metadata.setColumns(columns_);
storage_metadata.setConstraints(constraints_);
setInMemoryMetadata(storage_metadata);
}
ColumnsDescription StorageSQLite::getTableStructureFromData(
const SQLitePtr & sqlite_db_,
const String & table)
{
auto columns = fetchSQLiteTableStructure(sqlite_db_.get(), table);
if (!columns)
throw Exception(ErrorCodes::SQLITE_ENGINE_ERROR, "Failed to fetch table structure for {}", table);
return ColumnsDescription{*columns};
}
Pipe StorageSQLite::read(
const Names & column_names,
const StorageSnapshotPtr & storage_snapshot,
SelectQueryInfo & query_info,
ContextPtr context_,
QueryProcessingStage::Enum,
size_t max_block_size,
size_t /*num_streams*/)
{
if (!sqlite_db)
sqlite_db = openSQLiteDB(database_path, getContext(), /* throw_on_error */true);
storage_snapshot->check(column_names);
String query = transformQueryForExternalDatabase(
query_info,
column_names,
storage_snapshot->metadata->getColumns().getOrdinary(),
IdentifierQuotingStyle::DoubleQuotes,
LiteralEscapingStyle::Regular,
"",
remote_table_name,
context_);
LOG_TRACE(log, "Query: {}", query);
Block sample_block;
for (const String & column_name : column_names)
{
auto column_data = storage_snapshot->metadata->getColumns().getPhysical(column_name);
sample_block.insert({column_data.type, column_data.name});
}
return Pipe(std::make_shared<SQLiteSource>(sqlite_db, query, sample_block, max_block_size));
}
class SQLiteSink : public SinkToStorage
{
public:
explicit SQLiteSink(
const StorageSQLite & storage_,
const StorageMetadataPtr & metadata_snapshot_,
StorageSQLite::SQLitePtr sqlite_db_,
const String & remote_table_name_)
: SinkToStorage(metadata_snapshot_->getSampleBlock())
, storage{storage_}
, metadata_snapshot(metadata_snapshot_)
, sqlite_db(sqlite_db_)
, remote_table_name(remote_table_name_)
{
}
String getName() const override { return "SQLiteSink"; }
void consume(Chunk chunk) override
{
auto block = getHeader().cloneWithColumns(chunk.getColumns());
WriteBufferFromOwnString sqlbuf;
sqlbuf << "INSERT INTO ";
sqlbuf << doubleQuoteString(remote_table_name);
sqlbuf << " (";
for (auto it = block.begin(); it != block.end(); ++it)
{
if (it != block.begin())
sqlbuf << ", ";
sqlbuf << quoteString(it->name);
}
sqlbuf << ") VALUES ";
auto writer = FormatFactory::instance().getOutputFormat("Values", sqlbuf, metadata_snapshot->getSampleBlock(), storage.getContext());
writer->write(block);
sqlbuf << ";";
char * err_message = nullptr;
int status = sqlite3_exec(sqlite_db.get(), sqlbuf.str().c_str(), nullptr, nullptr, &err_message);
if (status != SQLITE_OK)
{
String err_msg(err_message);
sqlite3_free(err_message);
throw Exception(ErrorCodes::SQLITE_ENGINE_ERROR,
"Failed to execute sqlite INSERT query. Status: {}. Message: {}",
status, err_msg);
}
}
private:
const StorageSQLite & storage;
StorageMetadataPtr metadata_snapshot;
StorageSQLite::SQLitePtr sqlite_db;
String remote_table_name;
};
SinkToStoragePtr StorageSQLite::write(const ASTPtr & /* query */, const StorageMetadataPtr & metadata_snapshot, ContextPtr /*context*/, bool /*async_insert*/)
{
if (!sqlite_db)
sqlite_db = openSQLiteDB(database_path, getContext(), /* throw_on_error */true);
return std::make_shared<SQLiteSink>(*this, metadata_snapshot, sqlite_db, remote_table_name);
}
void registerStorageSQLite(StorageFactory & factory)
{
factory.registerStorage("SQLite", [](const StorageFactory::Arguments & args) -> StoragePtr
{
ASTs & engine_args = args.engine_args;
if (engine_args.size() != 2)
throw Exception(ErrorCodes::NUMBER_OF_ARGUMENTS_DOESNT_MATCH, "SQLite database requires 2 arguments: database path, table name");
for (auto & engine_arg : engine_args)
engine_arg = evaluateConstantExpressionOrIdentifierAsLiteral(engine_arg, args.getLocalContext());
const auto database_path = checkAndGetLiteralArgument<String>(engine_args[0], "database_path");
const auto table_name = checkAndGetLiteralArgument<String>(engine_args[1], "table_name");
auto sqlite_db = openSQLiteDB(database_path, args.getContext(), /* throw_on_error */!args.attach);
return std::make_shared<StorageSQLite>(args.table_id, sqlite_db, database_path,
table_name, args.columns, args.constraints, args.getContext());
},
{
.supports_schema_inference = true,
.source_access_type = AccessType::SQLITE,
});
}
}
#endif
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