add: migration from main exe

add: sql files embedded in exe

helpers/migrate_sql.cc

@@ -0,0 +1,63 @@
+#include <helpers.h>
+#include <globals.h>
+#include <drogon/trantor/trantor/utils/Logger.h>
+
+#include <config.h>
+
+#include <sql/migration_0.h>
+
+int
+helpers::migrate_sql()
+{
+    uint16_t version_num = 0;
+    int s, rc;
+    sqlite3_stmt *stmt;
+    sqlite3_prepare_v2(globals::db, "SELECT version_num FROM meta LIMIT 1;", -1, &stmt, nullptr);
+    s = sqlite3_step(stmt);
+    if (s == SQLITE_ROW)
+    {
+        version_num = sqlite3_column_int(stmt, 0);
+    }
+    else
+    {
+        version_num = 0;
+    }
+
+    uint16_t new_version_num = version_num;
+    char* err_msg;
+    char* sql;
+
+    sqlite3_finalize(stmt);
+
+    switch(version_num)
+    {
+        case 0:
+            rc = sqlite3_exec(globals::db, (const char *)sql_migration_0_sql, nullptr, nullptr, &err_msg);
+            if(rc != 0)
+            {
+                LOG_FATAL << "Couldn't migrate LEVEL 0 (" << err_msg << ")";
+                break;
+            }
+            new_version_num = 1;
+        default:
+            break;
+    }
+
+    if(version_num == 0)
+    {
+        sqlite3_prepare_v2(globals::db, "INSERT INTO meta (version_num) VALUES (?1);", -1, &stmt, nullptr);
+    }
+    else
+    {
+        sqlite3_prepare_v2(globals::db, "UPDATE meta SET version_num=?1;", -1, &stmt, nullptr);
+    }
+    sqlite3_bind_int(stmt, 1, new_version_num);
+
+    rc = sqlite3_step(stmt);
+    if (rc != SQLITE_DONE)
+    {
+        LOG_FATAL << "Couldn't write new Schema Version";
+    }
+
+    return rc == SQLITE_DONE;
+}