■ Reference Sites
https://developer.tizen.org/dev-guide/2.3.0/org.tizen.mobile.web.appprogramming/html/guide/w3c_guide/storage_guide/indexed_database.htm https://developer.tizen.org/dev-guide/2.3.0/org.tizen.mobile.web.appprogramming/html/guide/w3c_guide/storage_guide/web_sql_database.htm

if (window.openDatabase) {
    // TODO (WebSQL)
}
else if (window.indexedDB) {
    // TODO (Indexed DB)
} 
else {
    // TODO (No DB)
}