Apollo msnodesqlv8 Data Source

Documentation

View the Apollo Server documentation for data sources for more details.

You may also want to look at the msnodesqlv8 documentation for how to create a connection pool and how to install the driver.

Usage

To get started, install the @fr/apollo-datasource-msnodesqlv8 package

yarn add @fr/apollo-datasource-msnodesqlv8

To define a datasource extend the MssqlDataSource class and implement methods as needed. Things to be aware of:

• When using this library it is recommended that you use typescript
• When you are ready to initialize the class the construction expects a single parameter containing a connection pool. This package uses the promise api from msnodesqlv8 so it is recommended that you add pool.on("error", () => {}). This will allow the promises to properly handle errors thrown by sql. Unfortunately this will swallow errors for non promise queries. See this issue for more details.
• The MssqlDataSource class provides a single protected method named query:
  • It accepts two type arguments:
    • The result type
      • If returning a single result set this should be RecordType[]
      • If returning multiple result sets this should be [RecordType1[], RecordType2[], ....]
    • The output type (if you are returning output parameters)
  • and three parameters
    • The query string
      • This can be any valid tsql query including calls to stored procedures
    • The parameters
      • This accepts an object which will expose all properties to your query via @PropertyName (case matching the property) and must contain the return value of one of the type functions exposed by this library which match the sql types:
        • Boolean Values
          • bit(value: boolean | null)
        • Binary Values
          • varBinary(value: Buffer | null, length: number)
          • varBinaryMax(value: Buffer | null)
        • Date and Time
          • Note: these methods take in either a JS Date object or a string value that the JS Date function can parse. See the documentation for your platform to determine what strings are supported
          • time(value: Date | string | null)
          • date(value: Date | string | null)
          • dateTime(value: Date | string | null)
          • dateTime2(value: Date | string | null)
          • smallDateTime(value: Date | string | null)
          • dateTimeOffset(value: Date | string | null)
        • Numbers
          • bigInt(value: number | null)
          • int(value: number | null)
          • money(value: number | null)
          • smallMoney(value: number | null)
          • tinyInt(value: number | null)
          • smallInt(value: number | null)
          • float(value: number | null, mantissa: number)
          • real(value: number | null, mantissa: number)
          • decimal(value: number | null, precision: number, scale: number)
          • numeric(value: number | null, precision: number, scale: number)
        • Variable Length Strings
          • varChar(value: string | null, length: number)
          • varCharMax(value: string | null)
          • nVarChar(value: string | null, length: number)
          • nVarCharMax(value: string | null)
          • uniqueIdentifier(value: string | null)
          • xml(value: string | null)
        • Static Length Strings
          • Note: For these if the length is not provided the length of the string will be used (minimum 1)
          • char(value: string | null, length?: number)
          • nChar(value: string | null, length?: number)
    • (optional) an object which can contain a few options.
      • timeoutMs: default 0 i.e. no timeout
      • raw: passed directly to msnodesqlv8
      • queryPrefix: Query text to add before the parameters
      • cacheKey: If provided will enable query result caching, this is the cache key that will be used
      • cacheTtl: The length of time to hold onto the cache, if not provided the default ttl will be used
• And will return an object containing:
  • elapsed: The number of ms it took the call to complete
  • meta: Metadata about the query
  • (if returning multiple result sets) results: A 2d array containing the results
  • (if returning a single result set) result: a 1d array containing the results
  • output: Output parameters if any
  • info: Strings printed from the query
  • counts: Update, insert, and delete counts
  • returns: Return code
  • errors: A list of errors returned by sql

Developing

This repository uses yarn v2 with corepack, before installing make sure you Install Corepack. Once complete simply run yarn. Once installed you can build the project by running yarn build