loadMirrors.cc

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// gsystem
#include "systemSqliteFactory.h"
#include "gsystemConventions.h"
 
namespace {
bool mirrors_column_exists(sqlite3* db, const std::string& column_name) {
    sqlite3_stmt* stmt = nullptr;
    int rc = sqlite3_prepare_v2(db, "SELECT name FROM PRAGMA_TABLE_INFO('mirrors')", -1, &stmt, nullptr);
    if (rc != SQLITE_OK) { return false; }
 
    bool exists = false;
    while ((rc = sqlite3_step(stmt)) == SQLITE_ROW) {
        const unsigned char* colText = sqlite3_column_text(stmt, 0);
        if (colText != nullptr && column_name == reinterpret_cast<const char*>(colText)) {
            exists = true;
            break;
        }
    }
 
    sqlite3_finalize(stmt);
    return exists;
}
}
 
void GSystemSQLiteFactory::loadMirrors(GSystem* system) {
    // skip ROOT system
    if (system->getName() == ROOTWORLDGVOLUMENAME) { return; }
 
    // Initialize the DB if needed.
    if (db == nullptr) { initialize_sqlite_db(system); }
 
    // Check that db is valid.
    if (db == nullptr) { log->error(ERR_GSQLITEERROR, "Database pointer is still null after initialization."); }
 
    // Databases created before mirror support may lack the table, and databases whose
    // systems define no mirrors carry a bare table with only the id column: mirrors
    // are optional in both cases.
    if (!table_exists(db, "mirrors") || !mirrors_column_exists(db, "name")) {
        log->info(2, "No usable 'mirrors' table in the database. This is ok if no system defines mirrors.");
        return;
    }
 
    // Columns are selected explicitly by name (in the canonical GMirror parameter order)
    // so the loader does not depend on the table column order.
    const std::string transmittance_column = mirrors_column_exists(db, "transmittance")
                                               ? "transmittance"
                                               : "NULL AS transmittance";
    const std::string sql_query =
        "SELECT name, description, type, finish, model, border, matOptProps, photonEnergy, "
        "indexOfRefraction, reflectivity, efficiency, specularlobe, specularspike, backscatter, "
        + transmittance_column +
        ", sigmaAlpha FROM mirrors WHERE experiment = ? AND system = ? AND variation = ? AND run = ?";
    sqlite3_stmt* stmt = nullptr;
    int           rc   = sqlite3_prepare_v2(db, sql_query.c_str(), -1, &stmt, nullptr);
    if (rc != SQLITE_OK) {
        log->error(ERR_GSQLITEERROR, "Sqlite error preparing query in loadMirrors: ",
                   sqlite3_errmsg(db), " (", rc, ") using query: ", sql_query);
    }
 
    // Bind parameters.
    std::string experiment  = system->getExperiment();
    std::string system_name = system->getName();
    std::string variation   = system->getVariation();
    int         runno       = system->getRunno();
 
    sqlite3_bind_text(stmt, 1, experiment.c_str(), -1, SQLITE_STATIC);
    sqlite3_bind_text(stmt, 2, system_name.c_str(), -1, SQLITE_STATIC);
    sqlite3_bind_text(stmt, 3, variation.c_str(), -1, SQLITE_STATIC);
    sqlite3_bind_int(stmt, 4, runno);
 
    // Log the expanded SQL for debugging (caller must free it).
    if (auto sql = sqlite3_expanded_sql(stmt)) {
        log->info(2, sql);
        sqlite3_free(sql);
    }
 
    std::vector<std::string> gmirrorPars;
    while ((rc = sqlite3_step(stmt)) == SQLITE_ROW) {
        const int ncols = sqlite3_column_count(stmt);
        for (int i = 0; i < ncols; ++i) {
            const char* cname = sqlite3_column_name(stmt, i);
 
            // Safely get text (use a literal "NULL" for SQLITE_NULL)
            const char* ctext =
                (sqlite3_column_type(stmt, i) == SQLITE_NULL)
                    ? "NULL"
                    : reinterpret_cast<const char*>(sqlite3_column_text(stmt, i));
 
            log->info(2, "<sqlite> column: ", cname, " = ", ctext);
 
            gmirrorPars.emplace_back(ctext);
        }
        system->addGMirror(gmirrorPars);
        gmirrorPars.clear();
    }
 
    if (rc != SQLITE_DONE) {
        log->error(ERR_GSQLITEERROR, "Sqlite database error in loadMirrors: ",
                   sqlite3_errmsg(db), " (", rc, ")");
    }
 
    sqlite3_finalize(stmt);
}