Editor example Join tables - link table

Data in relational databases is often stored over multiple tables, partitioned by the data type and then joined together using SQL JOIN queries. In one form of joined table, a 'link' table is used linking records between two different types of data.

In this example, which extends the simple join example, the users and dept tables are linked by the user_dept table. When the data is read, we read from all three tables (plus the sites table to show multiple joins working together). The returned data structure for each row in this example is:

Javascript
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{
    "DT_RowId": "row_1",
    "users": {
        "first_name": "Quynn",
        "last_name": "Contreras",
        "site": "1"
    },
    "sites": {
        "name": "Edinburgh"
    },
    "user_dept": {
        "dept_id": "1"
    },
    "dept": {
        "name": "IT"
    }
}

For editing we want to write to three users fields and the user_dept field. The Editor instance is configured with these four fields using the fields.name option and the Editor server-side libraries perform the required SQL operations for us on create, edit and delete.

See the join documentation (PHP | .NET | NodeJS) for further information about joins with Editor's framework libraries.