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#include "my-selectcommand.h"
#include "my-column.h"
#include "my-connection.h"
#include "my-error.h"
#include <cstring>
MySQL::SelectCommand::SelectCommand(const Connection * conn, const std::string & sql) :
DB::Command(sql), DB::SelectCommand(sql), MySQL::Command(conn, sql), prepared(false), executed(false)
{
}
void
MySQL::SelectCommand::execute()
{
if (!prepared) {
bindParams();
fields.resize(mysql_stmt_field_count(stmt.get()));
for (auto & b : fields) {
memset(&b, 0, sizeof(MYSQL_BIND));
}
MYSQL_RES * prepare_meta_result = mysql_stmt_result_metadata(stmt.get());
MYSQL_FIELD * fieldDefs = mysql_fetch_fields(prepare_meta_result);
for (std::size_t i = 0; i < fields.size(); i += 1) {
switch (fieldDefs[i].type) {
case MYSQL_TYPE_TINY:
case MYSQL_TYPE_SHORT:
case MYSQL_TYPE_LONG:
case MYSQL_TYPE_INT24:
case MYSQL_TYPE_LONGLONG:
case MYSQL_TYPE_YEAR:
insertColumn(
std::make_unique<Column<int64_t, MYSQL_TYPE_LONGLONG>>(fieldDefs[i].name, i, &fields[i]));
break;
case MYSQL_TYPE_DECIMAL:
case MYSQL_TYPE_NEWDECIMAL:
case MYSQL_TYPE_FLOAT:
case MYSQL_TYPE_DOUBLE:
insertColumn(std::make_unique<Column<double, MYSQL_TYPE_DOUBLE>>(fieldDefs[i].name, i, &fields[i]));
break;
case MYSQL_TYPE_TIMESTAMP:
case MYSQL_TYPE_DATE:
case MYSQL_TYPE_DATETIME:
insertColumn(std::make_unique<Column<MYSQL_TIME, MYSQL_TYPE_DATETIME>>(
fieldDefs[i].name, i, &fields[i]));
break;
case MYSQL_TYPE_TIME:
insertColumn(
std::make_unique<Column<MYSQL_TIME, MYSQL_TYPE_TIME>>(fieldDefs[i].name, i, &fields[i]));
break;
case MYSQL_TYPE_STRING:
case MYSQL_TYPE_VAR_STRING:
insertColumn(std::make_unique<StringColumn>(fieldDefs[i].name, i, &fields[i], fieldDefs[i].length));
break;
case MYSQL_TYPE_NULL:
insertColumn(std::make_unique<NullColumn>(fieldDefs[i].name, i, &fields[i]));
break;
case MYSQL_TYPE_BIT:
case MYSQL_TYPE_BLOB:
case MYSQL_TYPE_SET:
case MYSQL_TYPE_ENUM:
case MYSQL_TYPE_GEOMETRY:
default:
mysql_free_result(prepare_meta_result);
throw DB::ColumnTypeNotSupported();
}
}
mysql_free_result(prepare_meta_result);
if (mysql_stmt_bind_result(stmt.get(), &fields.front())) {
throw Error(stmt.get());
}
prepared = true;
}
if (!executed) {
if (mysql_stmt_execute(stmt.get())) {
throw Error(stmt.get());
}
if (mysql_stmt_store_result(stmt.get())) {
throw Error(stmt.get());
}
executed = true;
}
}
bool
MySQL::SelectCommand::fetch()
{
execute();
switch (mysql_stmt_fetch(stmt.get())) {
case 0:
return true;
case MYSQL_NO_DATA:
executed = false;
return false;
default:
throw Error(stmt.get());
}
}
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