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//
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2026
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#include "td/db/SqliteStatement.h"
#include "td/utils/format.h"
#include "td/utils/logging.h"
#include "td/utils/StackAllocator.h"
#include "td/utils/StringBuilder.h"
#include "sqlite/sqlite3.h"
namespace td {
int VERBOSITY_NAME(sqlite) = VERBOSITY_NAME(DEBUG) + 10;
namespace {
int printExplainQueryPlan(StringBuilder &sb, tdsqlite3_stmt *pStmt) {
const char *zSql = tdsqlite3_sql(pStmt);
if (zSql == nullptr) {
return SQLITE_ERROR;
}
sb << "Explain query " << zSql;
char *zExplain = tdsqlite3_mprintf("EXPLAIN QUERY PLAN %s", zSql);
if (zExplain == nullptr) {
return SQLITE_NOMEM;
}
tdsqlite3_stmt *pExplain; /* Compiled EXPLAIN QUERY PLAN command */
int rc = tdsqlite3_prepare_v2(tdsqlite3_db_handle(pStmt), zExplain, -1, &pExplain, nullptr);
tdsqlite3_free(zExplain);
if (rc != SQLITE_OK) {
return rc;
}
while (SQLITE_ROW == tdsqlite3_step(pExplain)) {
int iSelectid = tdsqlite3_column_int(pExplain, 0);
int iOrder = tdsqlite3_column_int(pExplain, 1);
int iFrom = tdsqlite3_column_int(pExplain, 2);
const char *zDetail = reinterpret_cast<const char *>(tdsqlite3_column_text(pExplain, 3));
sb << '\n' << iSelectid << ' ' << iOrder << ' ' << iFrom << ' ' << zDetail;
}
return tdsqlite3_finalize(pExplain);
}
} // namespace
SqliteStatement::SqliteStatement(tdsqlite3_stmt *stmt, std::shared_ptr<detail::RawSqliteDb> db)
: stmt_(stmt), db_(std::move(db)) {
CHECK(stmt != nullptr);
}
SqliteStatement::~SqliteStatement() = default;
Result<string> SqliteStatement::explain() {
if (empty()) {
return Status::Error("No statement");
}
auto tmp = StackAllocator::alloc(10000);
StringBuilder sb(tmp.as_slice());
auto code = printExplainQueryPlan(sb, stmt_.get());
if (code != SQLITE_OK) {
return last_error();
}
if (sb.is_error()) {
return Status::Error("StringBuilder buffer overflow");
}
return sb.as_cslice().str();
}
Status SqliteStatement::bind_blob(int id, Slice blob) {
auto rc = tdsqlite3_bind_blob(stmt_.get(), id, blob.data(), static_cast<int>(blob.size()), nullptr);
if (rc != SQLITE_OK) {
return last_error();
}
return Status::OK();
}
Status SqliteStatement::bind_string(int id, Slice str) {
auto rc = tdsqlite3_bind_text(stmt_.get(), id, str.data(), static_cast<int>(str.size()), nullptr);
if (rc != SQLITE_OK) {
return last_error();
}
return Status::OK();
}
Status SqliteStatement::bind_int32(int id, int32 value) {
auto rc = tdsqlite3_bind_int(stmt_.get(), id, value);
if (rc != SQLITE_OK) {
return last_error();
}
return Status::OK();
}
Status SqliteStatement::bind_int64(int id, int64 value) {
auto rc = tdsqlite3_bind_int64(stmt_.get(), id, value);
if (rc != SQLITE_OK) {
return last_error();
}
return Status::OK();
}
Status SqliteStatement::bind_null(int id) {
auto rc = tdsqlite3_bind_null(stmt_.get(), id);
if (rc != SQLITE_OK) {
return last_error();
}
return Status::OK();
}
StringBuilder &operator<<(StringBuilder &sb, SqliteStatement::Datatype type) {
using Datatype = SqliteStatement::Datatype;
switch (type) {
case Datatype::Integer:
return sb << "Integer";
case Datatype::Float:
return sb << "Float";
case Datatype::Blob:
return sb << "Blob";
case Datatype::Null:
return sb << "Null";
case Datatype::Text:
return sb << "Text";
}
UNREACHABLE();
return sb;
}
Slice SqliteStatement::view_blob(int id) {
LOG_IF(ERROR, view_datatype(id) != Datatype::Blob) << view_datatype(id);
auto *data = tdsqlite3_column_blob(stmt_.get(), id);
auto size = tdsqlite3_column_bytes(stmt_.get(), id);
if (data == nullptr) {
return Slice();
}
return Slice(static_cast<const char *>(data), size);
}
Slice SqliteStatement::view_string(int id) {
LOG_IF(ERROR, view_datatype(id) != Datatype::Text) << view_datatype(id);
auto *data = tdsqlite3_column_text(stmt_.get(), id);
auto size = tdsqlite3_column_bytes(stmt_.get(), id);
if (data == nullptr) {
return Slice();
}
return Slice(data, size);
}
int32 SqliteStatement::view_int32(int id) {
LOG_IF(ERROR, view_datatype(id) != Datatype::Integer) << view_datatype(id);
return tdsqlite3_column_int(stmt_.get(), id);
}
int64 SqliteStatement::view_int64(int id) {
LOG_IF(ERROR, view_datatype(id) != Datatype::Integer) << view_datatype(id);
return tdsqlite3_column_int64(stmt_.get(), id);
}
SqliteStatement::Datatype SqliteStatement::view_datatype(int id) {
auto type = tdsqlite3_column_type(stmt_.get(), id);
switch (type) {
case SQLITE_INTEGER:
return Datatype::Integer;
case SQLITE_FLOAT:
return Datatype::Float;
case SQLITE_BLOB:
return Datatype::Blob;
case SQLITE_NULL:
return Datatype::Null;
case SQLITE3_TEXT:
return Datatype::Text;
default:
UNREACHABLE();
}
}
void SqliteStatement::reset() {
tdsqlite3_reset(stmt_.get());
state_ = State::Start;
}
Status SqliteStatement::step() {
if (state_ == State::Finish) {
return Status::Error("One has to reset statement");
}
VLOG(sqlite) << "Start step " << tag("query", tdsqlite3_sql(stmt_.get())) << tag("statement", stmt_.get())
<< tag("database", db_.get());
auto rc = tdsqlite3_step(stmt_.get());
VLOG(sqlite) << "Finish step with response " << (rc == SQLITE_ROW ? "ROW" : (rc == SQLITE_DONE ? "DONE" : "ERROR"));
if (rc == SQLITE_ROW) {
state_ = State::HaveRow;
return Status::OK();
}
state_ = State::Finish;
if (rc == SQLITE_DONE) {
return Status::OK();
}
return last_error();
}
void SqliteStatement::StmtDeleter::operator()(tdsqlite3_stmt *stmt) {
tdsqlite3_finalize(stmt);
}
Status SqliteStatement::last_error() {
return db_->last_error();
}
} // namespace td
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