better-sqlite3-model

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Quick Note - I honestly did not expect more than a few people to download this, so I must clarify

that this is an active work in progress and will be updated frequently. This is a public version of in house software,

so we will be updating as we find and patch bugs, and improve efficiency. We are open to public suggestions and forks.

Email for suggestions: [e-mail]

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A fast and simple model based orm wrapping JoshuaWise's better-sqlite3

Checkout JoshuaWise's better-sqlite3 module here

This was built from the need for an orm, and not wanting to switch from sqlite3 and better-sqlite3 (amazing package) This was pulled from private projects and made public in the hopes of helping those on embedded systems or those who just prefer sqlite3

This package requires your project to have better-sqlite3 and uuid installed

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Basic Usage

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Connect to a database

const Connect = require('better-sqlite3-model').Connect
// the connect function connects to a database file and caches the connection for the orm
// the database can be switched at any time but models will have to be re-initialized after
// the function is a wrapper for 'better-sqlite3's Database contructor and takes the same props
// the function returns a better-sqlite3 Database object. Calling without props will return the last connection used
Connect(path,options)

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Models are defined by extending the base Model class and implementing static get tableName() and static get jsonSchema()

Any function can be added to the model as long as it does not override the base methods

const Model = require('better-sqlite3-model').Model
class ExampleModel extends Model {
    static get tableName() {
        return 'example_model' // this is how models refer to eachother in the database
    }
    static get jsonSchema() { // this defines how the model looks
        // the model is already provided with an id field, and a uuid, createdAt, and lastUpdated fields are added to objects automatically 
        return {
            json: ['someData','someArrayData'], // this is an array of fields that will be passed through JSON.parse and JSON.stringify on save and load, respectively
            properties: { // this is where the models instance properties and types are declared
                aStringProperty: {type: 'string' , unique: true , allowNull: false},
                aNumberProperty: {type: 'integer'},
                someData: {type: 'object'},
                someArrayData: {type: 'array'},
                // relationships are defined as follows:
                aRelationship: {
                    manyHasMany: SomeOtherModel.tableName
                }
                // A relaship can be one of manyHasMany , oneHasMany , oneHasOne , hasOne
                // - note that the name of the field does not affect the name given to the property on an object. They will be merged according to below:
 
                // manyHasMany - loads children and adds them to instance as an array as the childs tableName with a 's' added. e.g. example_models
                // oneHasMany - similar to manyHasMany
                // oneHasOne - allows only one of this type of child to be linked, adding an object instead of an array and no 's' appended to the tableName
                // hasOne - similar to oneHasOne, but instead of using a lookup table for the child, the childs uuid is stored on the parent in the database,
                //        - and the child is loaded and added  to the parent on parent load
 
                // also note that if multiple relationships arre found in a property, the highest one on the list above takes precedence
            }
        }
    }
}

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Models are initialized by getting thier dollar sign method

ExampleModel.$

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Instances are created by calling a models dispense function, optionally passing any initial data for the instance

instances can be considered regular objects. Any props or functions can be added as long as they dont conflict with the base model

and they will be stripped when added to the database. note that added props and functions are not added back on database load

var instance = ExampleModel.dispense()

Instances can be saved and removed by using instance.save and instance.remove respectively. Note the lack of parenthesis

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Instances can be loaded from the database by calling thier models find function, passing any selectors

var loadedInstance = ExampleModel.find({name: 'example' , uuid: 'hghuhgshthkjhtw4-45234523c46-45c24636c2'})

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Instances can be linked (if a relationship is defined)

instance.link = loadedInstance

and unlinked

instance.unlink = loadedInstance

This is done using setter methods, so set link or unlink to the object you want to link/unlink to/from

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Models can hook into slots provided by the base model

This can be useful if a boolean field is needed

class ExampleModel extends Model {
    ...
    preInsert() {
        this.someBoolean ? this.someBoolean = 1 : this.someBoolean = 0;
    }
    preUpdate() {
        this.someBoolean ? this.someBoolean = 1 : this.someBoolean = 0;
    }
    preLoad() {
        this.someBoolean > 0 ? this.someBoolean = true : this.someBoolean = false
    }
    preRemove() {
        ...
    }
    preCheckout() {
        ...
    }
}