add: database transactions

src/database.c

@@ -7,6 +7,33 @@
 #include <sql/migration_0.h>
 
 sqlite3 *global_database;
+static int in_transaction;
+
+void
+database_init()
+{
+    int rc = sqlite3_open(global_config.database, &global_database);
+
+    if(rc)
+    {
+        LOGGER_CRIT("can't open database: %s\n", sqlite3_errmsg(global_database));
+        exit(1);
+    }
+
+    if(database_migrate())
+    {
+        exit(1);
+    }
+
+    sqlite3_exec(global_database, "PRAGMA foreign_keys = ON", 0, 0, 0);
+    in_transaction = 0;
+}
+
+void
+database_free()
+{
+    sqlite3_close(global_database);
+}
 
 int
 database_migrate()
@@ -65,3 +92,32 @@ database_migrate()
 
     return rc != SQLITE_DONE;
 }
+
+int
+database_transaction_begin()
+{
+    if(!in_transaction)
+    {
+        LOGGER_DEBUG("beginning transaction\n");
+        sqlite3_exec(global_database, "BEGIN TRANSACTION;", NULL, NULL, NULL);
+        in_transaction = 1;
+        return 1;
+    }
+    return 0;
+}
+
+void
+database_transaction_commit()
+{
+    LOGGER_DEBUG("commiting transaction\n");
+    sqlite3_exec(global_database, "COMMIT TRANSACTION;", NULL, NULL, NULL);
+    in_transaction = 0;
+}
+
+void
+database_transaction_rollback()
+{
+    LOGGER_DEBUG("rolling back transaction\n");
+    sqlite3_exec(global_database, "ROLLBACK TRANSACTION;", NULL, NULL, NULL);
+    in_transaction = 0;
+}