ClickHouse/dbms/src/Interpreters/ReplaceQueryParameterVisitor.cpp
2020-01-03 17:10:56 +03:00

69 lines
2.2 KiB
C++

#include <boost/algorithm/string/replace.hpp>
#include <Common/typeid_cast.h>
#include <Common/quoteString.h>
#include <Columns/IColumn.h>
#include <Core/Field.h>
#include <DataTypes/IDataType.h>
#include <DataTypes/DataTypeFactory.h>
#include <Formats/FormatSettings.h>
#include <IO/ReadBufferFromString.h>
#include <IO/WriteHelpers.h>
#include <Parsers/ASTLiteral.h>
#include <Parsers/ASTQueryParameter.h>
#include <Interpreters/ReplaceQueryParameterVisitor.h>
#include <Interpreters/addTypeConversionToAST.h>
namespace DB
{
namespace ErrorCodes
{
extern const int UNKNOWN_QUERY_PARAMETER;
extern const int BAD_QUERY_PARAMETER;
}
void ReplaceQueryParameterVisitor::visit(ASTPtr & ast)
{
for (auto & child : ast->children)
{
if (child->as<ASTQueryParameter>())
visitQueryParameter(child);
else
visit(child);
}
}
const String & ReplaceQueryParameterVisitor::getParamValue(const String & name)
{
auto search = query_parameters.find(name);
if (search != query_parameters.end())
return search->second;
else
throw Exception("Substitution " + backQuote(name) + " is not set", ErrorCodes::UNKNOWN_QUERY_PARAMETER);
}
void ReplaceQueryParameterVisitor::visitQueryParameter(ASTPtr & ast)
{
const auto & ast_param = ast->as<ASTQueryParameter &>();
const String & value = getParamValue(ast_param.name);
const String & type_name = ast_param.type;
const auto data_type = DataTypeFactory::instance().get(type_name);
auto temp_column_ptr = data_type->createColumn();
IColumn & temp_column = *temp_column_ptr;
ReadBufferFromString read_buffer{value};
FormatSettings format_settings;
data_type->deserializeAsTextEscaped(temp_column, read_buffer, format_settings);
if (!read_buffer.eof())
throw Exception("Value " + value + " cannot be parsed as " + type_name + " for query parameter '" + ast_param.name + "'"
" because it isn't parsed completely: only " + toString(read_buffer.count()) + " of " + toString(value.size()) + " bytes was parsed: "
+ value.substr(0, read_buffer.count()), ErrorCodes::BAD_QUERY_PARAMETER);
ast = addTypeConversionToAST(std::make_shared<ASTLiteral>(temp_column[0]), type_name);
}
}