Info API::DropTable(SqlCommandDropTable* command){
CatalogManager catalog_manager;
std::string table_name = command->table_name();
if (!catalog_manager.HasTable(table_name)){
std::string error_info;
error_info = "Table \"" + table_name + "\" not exists.";
return Info(error_info);
}
else{
TableInfo table = catalog_manager.GetTableInfo(table_name);
for (auto it : table.index_names()){
SqlCommandDropIndex* cmd = new SqlCommandDropIndex(it);
if(!DropIndex(cmd).is_succeed()){
return Info("Drop table success but index \"" + it +"\" failed to be dropped");
}
}
if (catalog_manager.DropTable(table_name)){
//drop index
return Info();
}
else{
return Info("Drop table Failed");
}
}
}
Info API::InsertInto(SqlCommandInsertInto* command){
CatalogManager catalog_manager;
RecordManager record_manager;
IndexManager index_manager;
int offset;
std::string table_name = command->table_name();
auto values = command->values();
if (!catalog_manager.HasTable(table_name)){
std::string error_info;
error_info = "Table \"" + table_name + "\" not exists.";
return Info(error_info);
}
TableInfo table = catalog_manager.GetTableInfo(table_name);
if (table.attribute_names_ordered().size()!=values.size()){
return Info("Number of values not equals to the number of attributes");
}
auto ano = table.attribute_names_ordered();
//Check string length and overflow
for (int i = 0; i<values.size(); ++i){
int type = table.attribute(ano.at(i)).type();
int length = table.attribute(ano.at(i)).length();
if (type == 0){
if (!is_int_overflow_notchecked(values.at(i))){
std::string error_info;
error_info = "Value \"" + values.at(i) + "\" is not a int number.";
return Info(error_info);
}
try{
int v = std::stoi(values.at(i));
}
catch(const std::out_of_range& e){
std::string error_info;
error_info = "Value \"" + values.at(i) + "\" is out of range of int.";
return Info(error_info);
}
}
if (type == 1){
if (!is_float_overflow_notchecked(values.at(i))&&!is_int_overflow_notchecked(values.at(i))){
std::string error_info;
error_info = "Value \"" + values.at(i) + "\" is not a float number.";
return Info(error_info);
}
try{
float v = std::stof(values.at(i));
}
catch(const std::out_of_range& e){
std::string error_info;
error_info = "Value \"" + values.at(i) + "\" is out of range of float.";
return Info(error_info);
}
}
if (type == 2){
if (values.at(i).length() > length){
std::string error_info;
error_info = "Value \"" + values.at(i) + "\" is out of range of char("+ std::to_string(length) +").";
return Info(error_info);
}
}
}
if (!CheckUnqiueAndPrimaryKey(table,values)){
return Info("Violation of uniqueness");
}
offset = record_manager.InsertRecord(table,values);
if (offset == -1){
return Info("Insert failed");
}
//update index
std::vector<std::string> index_names = table.index_names();
for (auto it : index_names){
IndexInfo index_info = catalog_manager.GetIndexInfo(it);
if(!index_manager.AddRecord(table,index_info,values.at(table.attribute_index(index_info.attribute_name())),offset)){
return Info("Update index failed.");
}
}
return Info();
}