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#include "SQLiteSource.h"
#if USE_SQLITE
#include <base/range.h>
#include <Common/logger_useful.h>
#include <Common/assert_cast.h>
#include <Columns/ColumnArray.h>
#include <Columns/ColumnDecimal.h>
#include <Columns/ColumnNullable.h>
#include <Columns/ColumnString.h>
#include <Columns/ColumnsNumber.h>
#include <DataTypes/DataTypeNullable.h>
namespace DB
{
namespace ErrorCodes
{
extern const int SQLITE_ENGINE_ERROR;
}
SQLiteSource::SQLiteSource(
SQLitePtr sqlite_db_,
const String & query_str_,
const Block & sample_block,
const UInt64 max_block_size_)
: ISource(sample_block.cloneEmpty())
, query_str(query_str_)
, max_block_size(max_block_size_)
, sqlite_db(std::move(sqlite_db_))
{
description.init(sample_block);
sqlite3_stmt * compiled_stmt = nullptr;
int status = sqlite3_prepare_v2(
sqlite_db.get(),
query_str.c_str(),
static_cast<int>(query_str.size() + 1),
&compiled_stmt, nullptr);
if (status != SQLITE_OK)
throw Exception(ErrorCodes::SQLITE_ENGINE_ERROR,
"Cannot prepare sqlite statement. Status: {}. Message: {}",
status, sqlite3_errstr(status));
compiled_statement = std::unique_ptr<sqlite3_stmt, StatementDeleter>(compiled_stmt, StatementDeleter());
}
Chunk SQLiteSource::generate()
{
if (!compiled_statement)
return {};
MutableColumns columns = description.sample_block.cloneEmptyColumns();
size_t num_rows = 0;
while (true)
{
int status = sqlite3_step(compiled_statement.get());
if (status == SQLITE_BUSY)
{
continue;
}
else if (status == SQLITE_DONE)
{
compiled_statement.reset();
break;
}
else if (status != SQLITE_ROW)
{
throw Exception(ErrorCodes::SQLITE_ENGINE_ERROR,
"Expected SQLITE_ROW status, but got status {}. Error: {}, Message: {}",
status, sqlite3_errstr(status), sqlite3_errmsg(sqlite_db.get()));
}
int column_count = sqlite3_column_count(compiled_statement.get());
for (int column_index = 0; column_index < column_count; ++column_index)
{
if (sqlite3_column_type(compiled_statement.get(), column_index) == SQLITE_NULL)
{
columns[column_index]->insertDefault();
continue;
}
auto & [type, is_nullable] = description.types[column_index];
if (is_nullable)
{
ColumnNullable & column_nullable = assert_cast<ColumnNullable &>(*columns[column_index]);
insertValue(column_nullable.getNestedColumn(), type, column_index);
column_nullable.getNullMapData().emplace_back(0);
}
else
{
insertValue(*columns[column_index], type, column_index);
}
}
if (++num_rows == max_block_size)
break;
}
if (num_rows == 0)
{
compiled_statement.reset();
return {};
}
return Chunk(std::move(columns), num_rows);
}
void SQLiteSource::insertValue(IColumn & column, ExternalResultDescription::ValueType type, int idx)
{
switch (type)
{
case ValueType::vtUInt8:
assert_cast<ColumnUInt8 &>(column).insertValue(sqlite3_column_int(compiled_statement.get(), idx));
break;
case ValueType::vtUInt16:
assert_cast<ColumnUInt16 &>(column).insertValue(sqlite3_column_int(compiled_statement.get(), idx));
break;
case ValueType::vtUInt32:
assert_cast<ColumnUInt32 &>(column).insertValue(static_cast<UInt32>(sqlite3_column_int64(compiled_statement.get(), idx)));
break;
case ValueType::vtUInt64:
/// There is no uint64 in sqlite3, only int and int64
assert_cast<ColumnUInt64 &>(column).insertValue(sqlite3_column_int64(compiled_statement.get(), idx));
break;
case ValueType::vtInt8:
assert_cast<ColumnInt8 &>(column).insertValue(sqlite3_column_int(compiled_statement.get(), idx));
break;
case ValueType::vtInt16:
assert_cast<ColumnInt16 &>(column).insertValue(sqlite3_column_int(compiled_statement.get(), idx));
break;
case ValueType::vtInt32:
assert_cast<ColumnInt32 &>(column).insertValue(sqlite3_column_int(compiled_statement.get(), idx));
break;
case ValueType::vtInt64:
assert_cast<ColumnInt64 &>(column).insertValue(sqlite3_column_int64(compiled_statement.get(), idx));
break;
case ValueType::vtFloat32:
assert_cast<ColumnFloat32 &>(column).insertValue(static_cast<Float32>(sqlite3_column_double(compiled_statement.get(), idx)));
break;
case ValueType::vtFloat64:
assert_cast<ColumnFloat64 &>(column).insertValue(sqlite3_column_double(compiled_statement.get(), idx));
break;
default:
const char * data = reinterpret_cast<const char *>(sqlite3_column_text(compiled_statement.get(), idx));
int len = sqlite3_column_bytes(compiled_statement.get(), idx);
assert_cast<ColumnString &>(column).insertData(data, len);
break;
}
}
}
#endif
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