NativeScript sqlite

A NativeScript module providing sqlite actions for Android and iOS.

License

This is released under the MIT License, meaning you are free to include this in any type of program -- However for entities that need a support contract, changes, enhancements and/or a commercial license please contact me (nathan@master-technology.com).

Encrypted SQLite

If you need encrypted sqlite, please contact nathan@master-technology.com for more information.

Example Application

An example application can be cloned from https://github.com/NathanaelA/nativescript-sqlite-example To use you need to do:

1. npm install tns-core-modules
2. tns platform add ios or tns platform add android
3. tns plugin add nativescript-sqlite Then run the app the normal way you would.

Installation

First run tns --version

v1.2.0 or later (Android)

Run tns plugin add nativescript-sqlite in your ROOT directory of your project.

v1.4.3 or later (iOs)

For the new seemless iOS install; you need to be running version 1.4.3 of the NativeScript command line. Run tns plugin add nativescript-sqlite in your ROOT directory of your project.

v1.4.2 or earlier

If you are running an earlier version of nativescript; then do a npm install -g nativescript to install the latest version of NativeScript.

Usage

To use the sqlite module you must first require() it:

var Sqlite = require( "nativescript-sqlite" );

After you have a reference to the module you can then call the available methods. The database defaults to returning result sets in arrays; i.e. [[field1, field2, ...], [field1, field2], [field1, field2] ...] you can change this to returning them in objects if you desire.

Shipping a Database with the application

If you are planning on shipping a database with the application; drop the file in your projects /app folder. The Sqlite.copyDatabase("database_name") will copy the database from that folder to the proper database folder on your platform.

Callbacks

• All callbacks have the standard (Error, result) prototype
• USE CALLBACKS or PROMISES; it is not recommended to use both

Promises

• Will either call your reject with the error or the resolve with the answer
• USE CALLBACKS or PROMISES; it is not recommended to use both

Constants

• Sqlite.RESULTSASARRAY - Returns results as Arrays (ex: select name, phone --- results [[name,phone]])
• Sqlite.RESULTSASOBJECT - Returns results as Objects (ex: select name, phone --- results [{name: name, phone: phone}]
• Sqlite.VALUESARENATIVE - Returns the values as the native values; i.e. Integer = Integer, Float = Number
• Sqlite.VALUESARESTRINGS - Returns all the values as a string; so the Integer 1 would be returned as "1"

Methods

new Sqlite(dbname, options, callback)

Parameters

• dbname: your database name. This can be ":memory:" for a memory Database. This can be "" for a Temporary Database.
• options - currently the only option is "readOnly", which if set to true will make the db read only when it opens it
• (optional) callback (error, db): db is the fully OPEN database object that allows interacting with the db.
• RETURNS: promise of the DB object

You should choose either to use a promise or a callback; you can use whichever you are most comfortable with -- however, as with this example, you CAN use both if you want; but side effects might occur.

// my-page.js
var Sqlite = require( "/path/to/node_modules/nativescript-sqlite" );
var db_promise = new Sqlite("MyTable", function(err, db) {
    if (err) { 
      console.error("We failed to open database", err);
    } else 
      // This should ALWAYS be true, db object is open in the "Callback" if no errors occurred
      console.log("Are we open yet (Inside Callback)? ", db.isOpen() ? "Yes" : "No"); // Yes
    }
});

db_promise.then(function(db) {
    // This should ALWAYS be true, db object is open in the "then"
      console.log("Are we open yet (Inside Promise)? ", db.isOpen() ? "Yes" : "No"); // Yes
      db.close();
   }, function(err) {
     console.error("We failed to open database", err);
   });

Sqlite.isSqlite

Parameters

• object to check
• RETURNS: Boolean, True or False if the object passed to this function is a sqlite database

// my-page.js
new Sqlite("test.db", function(err, db) {
  console.log("Is a Sqlite Database:", Sqlite.isSqlite(db) ? "Yes" : "No);  // Should print "Yes"
});

Sqlite.exists

Parameters

• database name
• RETURNS: Boolean, True if the database exists in the App/OS Database folder

Sqlite.deleteDatabase

• database name to delete in the App/OS Database folder
• RETURNS: Nothing

Sqlite.copyDatabase

• database name to copy from your app folder to the proper database folder on the OS
• RETURNS: True if copy was successful
• NOTES: This will only copy the file if it does not already exist at the destination.

// If we are in Debug Code, we always delete the database first so that the latest copy of the database is used... 
if (DEBUGMODE && Sqlite.exists("mydatabase.sqlite")) {
  Sqlite.deleteDatabase("mydatabase.sqlite");
}
if (!Sqlite.exists("mydatabase.sqlite")) {
  Sqlite.copyDatabase("mydatabase.sqlite");
}

DB Methods = Returned Database Object from Constructor

DB.version

Parameters

• Value to set it to, or a Callback for retrieving the value. If Callback Value will have the version. On a new Database it will be Zero If Version number, then the database will be changed to the version you passed to this function
• RETURNS: Promise.

new Sqlite("test.db", function(err, db) {
  db.version(function(err, ver) {
    if (ver === 0) {
      db.execSQL("Create table....");
      db.version(1); // Sets the version to 1
    }
  });
};

DB.isOpen

• RETURNS: Boolean, Is the current database open true/false

DB.resultType

Parameters

• Pass in Sqlite.RESULTSASOBJECT or Sqlite.RESULTSASARRAY to change the result sets configuration This will set the database to return the results in which ever choice you make. (Default is RESULTSASARRAY)

DB.valueType

Parameters

• Pass in Sqlite.VALUESARENATIVE or Sqlite.VALUESARESTRING to change the result sets configuration This will set the database to return the results to which ever choice you make. (Default is VALUESARENATIVE)

DB.close

• Closes the database
• RETURNS: Promise NOTE: Any DB calls after this will throw errors.

DB.execSQL

Parameters

• SQL statement to run, can use ? for Parameters
• Params (Optional) - an array of Parameters
• Callback will either return null or the last id inserted or the record count of update/delete This routine you can use for "update", "insert", "delete" and any other sqlite command where you are not expecting a result set back. If this is a Insert it will return the last row id of the new inserted record. If it is a update/insert it will return the number of rows affected.
• RETURNS: Promise; resolved results are the same as the callback values.

// new SQLite(....
db.execSQL("insert into Hello (word) values (?)", ["Hi"], function(err, id) {
  console.log("The new record id is:", id);
});

// new SQLite(....
var promise = db.execSQL("insert into Hello (word) values (?)", ["Hi"]);
promise.then(function(id) {
        console.log("The new record id is:", id);
}); 

DB.get

Parameters

• SQL SELECT statement, can use ? for parameters
• Params (Optional)
• Callback will have the first row of the result set.
• RETURNS: Promise, will has have first row.

// new SQLite(...
db.get('select * from Hello where id=?', [1], function(err, row) {
  console.log("Row of data was: ", row);  // Prints [["Field1", "Field2",...]]
});

// new SQLite(...
var promise = db.get('select * from Hello where id=?', [1]);
promise.then(function(row) {
    console.log("Row of data was: ", row);  // Prints [["Field1", "Field2",...]]
});

DB.all

Parameters

• SQL SELECT statement, can use ? for parameters
• Params (Optional)
• Callback will have the all the rows of the result set.
• RETURNS: Promise, will have all the rows of the result set.

// new SQLite(...
db.all('select * from Hello where id > ? and id < ?', [1,100], function(err, resultSet) {
  console.log("Result set is:", resultSet); // Prints [["Row_1 Field_1" "Row_1 Field_2",...], ["Row 2"...], ...]
});

// new SQLite(...
var promise = db.all('select * from Hello where id > ? and id < ?', [1,100]);
promise.then(function(resultSet) {
  console.log("Result set is:", resultSet); // Prints [["Row_1 Field_1" "Row_1 Field_2",...], ["Row 2"...], ...]
});

DB.each

Parameters

• SQL Select statement, can use ? for parameters
• Params (Optional)
• Callback (REQUIRED) will be called for EACH row of the result set with the current row value
• Finished_Callback (Optional) will be called when it is complete with the number of rows handled.
• RETURNS: Promise; please note the per row CALLBACK is still required; otherwise you won't have any results...

// new SQLite(...
db.each('select * from Hello where id >= ? and id <= ?', [1, 100], 
function (err, row) {
  console.log("Row results it:", row); // Prints ["Row x Field_1", "Row x Field 2"...] for each row passed to it
},
function (err, count) {
  console.log("Rows displayed:", count); // Prints 100  (Assuming their are a 100 rows found)
});

// new SQLite(...
var promise = db.each('select * from Hello where id >= ? and id <= ?', [1, 100], 
function (err, row) {
  console.log("Row results it:", row); // Prints ["Row x Field_1", "Row x Field 2"...] for each row passed to it
});
promise.then(function (count) {
  console.log("Rows displayed:", count); // Prints 100  (Assuming their are a 100 rows found)
});