Storing user and message data with LocalStorage technology

Question

Storing user and message data with LocalStorage technology

Seeking advice on a straightforward approach to storing user data and messages. My idea is to use unique key values, such as random tokens (Ynjk_nkjSNKJN) for users, and real ids (1,2,3) for messages.

Has anyone encountered this issue before?

The goal is to ensure that localStorage remains current with new server messages without deleting any users in the process.

Thank you

javascript angularjs local-storage

Answer 1

Answer №1

If you want to work with "tables" in the localStorage, you can follow this approach:

//columns should be an array of column literals
function createTable(tableName, columns) {
    db[tableName] = {rows: {}, columns: columns};
}

function insertInto(tableName, row, id) {
    var newRow = {};
    for (var columnName in row) {
        if (db[tableName].columns.indexOf(columnName) === -1) {
            //invalid column
            return false;
        }
        newRow[columnName] = row[columnName];
    }
    db[tableName].rows[id] = newRow;
    return true;
}

function getIDs(tableName, where) {
    var IDs = [];
    for (var id in db[tableName].rows) {
        if (where(db[tableName].rows[id])) {
            IDs[IDs.length]=id;
        }
    }
    return IDs;
}

function update(tableName, where, what) {
    what(tableName, getIDs(tableName, where));
}

function deleteRecord(tableName, where) {
    var removeIDs = getIDs(tableName, where);
    for (var id in removeIDs) {
        //Could be done by regexes, but I am not fluent with them and I am lazy to check them out
        delete db[tableName].rows[removeIDs[id]];
    }
}

function select(tableName, where) {
    var IDs = getIDs(tableName, where);
    var result = {};
    for (var id in db[tableName].rows) {
        result[id] = db[tableName].rows[id];
    }
    return result;
}

function dropTable(tableName) {
    delete db[tableName];
}

This is a basic implementation, but you can extend it to include altering, joining, grouping, and more. The goal here is to demonstrate how to create a simple database structure. Now, let's move on to storing the database in the localStorage:

localStorage.setItem("db", JSON.stringify(db));

To access the stored database after reloading the page, you need to convert the local storage item back to an object. Here's how you can initialize db:

var db = !!localStorage.getItem("db") ? angular.fromJson(localStorage.getItem("db")) : {};

Answer 2

If you want to work with "tables" in the localStorage, you can follow this approach:

//columns should be an array of column literals
function createTable(tableName, columns) {
    db[tableName] = {rows: {}, columns: columns};
}

function insertInto(tableName, row, id) {
    var newRow = {};
    for (var columnName in row) {
        if (db[tableName].columns.indexOf(columnName) === -1) {
            //invalid column
            return false;
        }
        newRow[columnName] = row[columnName];
    }
    db[tableName].rows[id] = newRow;
    return true;
}

function getIDs(tableName, where) {
    var IDs = [];
    for (var id in db[tableName].rows) {
        if (where(db[tableName].rows[id])) {
            IDs[IDs.length]=id;
        }
    }
    return IDs;
}

function update(tableName, where, what) {
    what(tableName, getIDs(tableName, where));
}

function deleteRecord(tableName, where) {
    var removeIDs = getIDs(tableName, where);
    for (var id in removeIDs) {
        //Could be done by regexes, but I am not fluent with them and I am lazy to check them out
        delete db[tableName].rows[removeIDs[id]];
    }
}

function select(tableName, where) {
    var IDs = getIDs(tableName, where);
    var result = {};
    for (var id in db[tableName].rows) {
        result[id] = db[tableName].rows[id];
    }
    return result;
}

function dropTable(tableName) {
    delete db[tableName];
}

This is a basic implementation, but you can extend it to include altering, joining, grouping, and more. The goal here is to demonstrate how to create a simple database structure. Now, let's move on to storing the database in the localStorage:

localStorage.setItem("db", JSON.stringify(db));

To access the stored database after reloading the page, you need to convert the local storage item back to an object. Here's how you can initialize db:

var db = !!localStorage.getItem("db") ? angular.fromJson(localStorage.getItem("db")) : {};

Answer 3

Answer №2

LocalStorage acts as a storage facility for key-value pairs, all stored in the form of strings. Each message and user is given a unique key, such as "messages" and "users", respectively.

To effectively manage this data, two separate (angular) services must be created - one dedicated to handling messages and the other designed for users. These services will interact with LocalStorage using their respective keys to carry out required tasks and operations.

If you can provide additional details, we'll be able to offer more tailored assistance.

Answer 4

LocalStorage acts as a storage facility for key-value pairs, all stored in the form of strings. Each message and user is given a unique key, such as "messages" and "users", respectively.

To effectively manage this data, two separate (angular) services must be created - one dedicated to handling messages and the other designed for users. These services will interact with LocalStorage using their respective keys to carry out required tasks and operations.

If you can provide additional details, we'll be able to offer more tailored assistance.

Storing user and message data with LocalStorage technology

Answer №1

Answer №2

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