Loopback Connector Disregards Property Name

Description / Steps to reproduce / Feature proposal

The @ property decorator has a name property which should specify the column name in the database in case it does not match with the field name in your model. However, the code in loopback-connector/sql.js does not utilize this metada so you only get the field name as it's defined in your model. In my case, I am using DB2 and this causes issues because the generated SQL select statement uses double-quotes around each field signify to DB2 that the field name matches exactly with what is specified in the DB (i.e. case sensitive).

To Reproduce:
Create a DB2 database w

1. ith a table "DRIVER" that contains field "DRIVER_ID".
2. Setup a basic Loopback4 project like the Todo Tutorial (replacing instances of Todo with Driver) but use a DB2 based datasource.
3. Create the Model like the following:

@model({
  name: 'DRIVER',   // This corrects the case-sensitive issue at the Table level.
  }
})
export class Driver extends Entity {
  @property({
    name: 'DRIVER_ID', // This is ignored by field mapping functions.
    type: 'number',
    id: true,
  })
  fooId?: number;

4. Use VS Code to start the server in Debug and issue a GET against drivers
5. In the sql.js --> buildColumnNames note that the name is 'fooId' instead of 'DRIVER_ID'
6. Continue execution, you will receive an SQL0206N error from DB2: "fooId" is not valid in the context where it used.

Current Behavior

sql.js simply uses the field names as the DB column names.

Expected Behavior

sql.js should map to the @ property 'name' property to determine the correct column names.

Connectors to fix

• SQL connectors - done by strongloop/loopback-connector#142
• MongoDB https://github.com/strongloop/loopback-connector-mongodb
• CouchDB2 https://github.com/strongloop/loopback-connector-couchdb2
• Cloudant https://github.com/strongloop/loopback-connector-cloudant (may depend on couchdb2)
• Cassandra https://github.com/strongloop/loopback-connector-cassandra

loopback-connector/sql.js の buildColumnNames から始め、フィールド名の処理を、再現手順に示されているプロパティ名のメタデータと比較してください。この issue を変更する前に、参照されている SQL connector の変更を確認してください。生成された SELECT 列が fooId プロパティに対して DRIVER_ID を使用し、DB2 の再現で SQL0206N が発生しなくなれば完了です。