dbschema-parser

dbschema-parser

Parses .dbs files from the DbSchema Diagram Designer and Query Tool from Wise Coders Solutions.

Installation

npm install dbschema-parser

Usage

Initializing the Parser

var dbSchema  = require('dbschema-parser');
var parser = new dbSchema.Parser(filePath);

Rendered Objects

Parser

Single instance. Top-most object.

Properties

• databases: array[Database] : Array of Database objects.
• path: string : Path to supplied .dbs file.
• xml: string : Contents of .dbs file in raw XML format.
• object: object : Parsed .dbs file in JSON object format.
• json: string : Parsed .dbs file in pretty-printed JSON format (non-object).

Database

Extrapolation of the DbSchema Project object. Assumes all schemas are contained within a single database.

Properties

• parser: Parser : Reference to parent Parser object.
• project: object : Reference to raw DbSchema object in JSON object format.
• name: string : Name of database.
• id: string : ID of Project, as supplied by DbSchema.
• template: string : Template of Project, as supplied by DbSchema.
• type: string : Database type (ie, MySql, MariaDb, MongoDb, etc.).
• schemas: array[Schema] : Array of Schema objects contained within Database

Schema

Properties

• database: Database: Reference to parent Database object.
• schema: object: Reference to raw DbSchema object in JSON object format.
• name: string: Name of schema.
• tables: array[Table]: Array of Table objects contained within Database.
• views: array[Table]: Array of Table objects contained within Database.

Table

Note: Due to the near-identical structure of both, the Table object is used for both tables and views.

Properties

• schema: Schema: Reference to parent Schema object.
• table: object: Reference to raw DbSchema object in JSON object format.
• name: string: Name of table or view.
• keyColumns: array[Column]: Array of Column objects within this primary key Table Index.
• isView: boolean: Indicates whether the table is actually a view.
• columns: array[Column]: Array of Column objects contained within the Table.
• indices: array[TableIndex]: Array of Table Index objects contained within the Table.

Column

Properties

• table: Table: Reference to parent Table object.
• column: object: Reference to raw DbSchema object in JSON object format.
• name: string: Name of column.
• type: string: Type of column.
• length: number: If supplied, the length of the column.
• jt: number: (See DbSchema documentation.)
• isPrimary: boolean: Column a member of the primary key index.
• mandatory: boolean: Column is required or NOT NULL
• relationships: array[Column]: (not required) Any columns referencing this column in a foreign key.
• parent: object: (not required) The target PK column if a foreign key exists:

parent: {
    schema: {
        name: '',
        item:
    },
    table: {
        name: '',
        item:
    },
    column: {
        name: '',
        item:
    }
}

Table Index

Properties

• table: Table: Reference to parent Table object.
• index: object: Reference to raw DbSchema object in JSON object format.
• name: string: Name of index (usually generated by database or DbSchema).
• columns: array[Column]: Array of Column objects within this index.
• type: string: Type name, as supplied by DbSchema (ie, NORMAL, PRIMARY_KEY, UNIQUE, etc.).
• isUnique: boolean: Indicates if the column combination must be unique (also true for the primary key).
• isPrimary: boolean: Table Index is the primary key.

Operations

Generally speaking, the Parser is meant to be used for navigating, or "walking", the DbSchema-generated hierarchy. However, for convenience, one operation is available:

print(spacing)

Prints the hierarchy in a human-readable YML-like indented structure:

Database: resources
    Schema: geography
        Table: city
            Column: id
                Relationships:
                    resources.geography.postal_code.city_id
            Column: state_id
                Primary:
                    Schema: geography
                    Table:  state
                    Column: id
            Column: name
            Index: idx_city (UNIQUE)
                Column: state_id
                    Primary:
                        Schema: geography
                        Table:  state
                        Column: id
                Column: name
            Index: idx_city_0 (NORMAL)
                Column: state_id
                    Primary:
                        Schema: geography
                        Table:  state
                        Column: id
            Index: pk_city (PRIMARY_KEY)
                Column: id
        Table: country
            Column: id
                Relationships:
                    resources.geography.postal_code.country_id
                    resources.geography.state.country_id
            Column: name
            Index: idx_country (UNIQUE)
                Column: name
            Index: pk_country (UNIQUE)
                Column: id
        Table: postal_code
            Column: id
            Column: country_id
                Primary:
                    Schema: geography
                    Table:  country
                    Column: id
            Column: state_id
                Primary:
                    Schema: geography
                    Table:  state
                    Column: id
            Column: city_id
                Primary:
                    Schema: geography
                    Table:  city
                    Column: id
            Column: value
            Index: pk_postal_code (PRIMARY_KEY)
                Column: id
            Index: idx_postal_code (UNIQUE)
                Column: country_id
                    Primary:
                        Schema: geography
                        Table:  country
                        Column: id
                Column: state_id
                    Primary:
                        Schema: geography
                        Table:  state
                        Column: id
                Column: city_id
                    Primary:
                        Schema: geography
                        Table:  city
                        Column: id
                Column: value
            Index: idx_postal_code_0 (NORMAL)
                Column: country_id
                    Primary:
                        Schema: geography
                        Table:  country
                        Column: id
            Index: idx_postal_code_1 (NORMAL)
                Column: state_id
                    Primary:
                        Schema: geography
                        Table:  state
                        Column: id
            Index: idx_postal_code_2 (NORMAL)
                Column: city_id
                    Primary:
                        Schema: geography
                        Table:  city
                        Column: id
        Table: state
            Column: id
                Relationships:
                    resources.geography.city.state_id
                    resources.geography.postal_code.state_id
            Column: country_id
                Primary:
                    Schema: geography
                    Table:  country
                    Column: id
            Column: name
            Index: idx_state (UNIQUE)
                Column: country_id
                    Primary:
                        Schema: geography
                        Table:  country
                        Column: id
                Column: name
            Index: idx_state_0 (NORMAL)
                Column: country_id
                    Primary:
                        Schema: geography
                        Table:  country
                        Column: id
            Index: pk_state_0 (PRIMARY_KEY)
                Column: id

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