little-mermaid-2-the-sql

• a command line tool for generating create sql from mermaid erDiagram

Getting Started

1. npm install -g @funktechno/little-mermaid-2-the-sql
2. littleMermaid2SQL --help
3. littleMermaid2SQL -d dbType --src markdownFilePath

Generating Mermaid erDiagram

• see samples for more information

Ala Cart

1. npm install --save @funktechno/little-mermaid-2-the-sql
2. Example

   • from markdown content

     import { GenerateSqlFromMermaid } from "@funktechno/little-mermaid-2-the-sql/lib/src/Library";
     import { MarkdownContentResponseI } from "@funktechno/little-mermaid-2-the-sql/lib/src/types";
     import { DbEntityAttributesDefinition, DbRelSpec } from "@funktechno/little-mermaid-2-the-sql/lib/src/types";
     
           
     const markdownContent:MarkdownContentResponseI ={
       settings: {
           database: "postgres",
           outputName: "result",
           isRaw: false,
           src: ""
       },
       content:`
       #Test
       \`\`\`mermaid
       erDiagram
           %% comment 1
           Persons {
               int PersonID PK "NOT NULL"
               varchar255 LastName
               varchar255 FirstName
               varchar255 Address
               varchar255 City
           }
     
           %% comment 2
           Orders {
               int OrderID PK "NOT NULL"
               int PersonID FK "NOT NULL"
           }
       
           Persons ||--o{ Orders : "[Persons.PersonId] to [Orders.PersonId]"
       \`\`\`
       `
     };
     
     const sqlOutputs = GenerateSqlFromMermaid(markdownContent);

   • manual mermaid db model

     import { DbParser } from "@funktechno/little-mermaid-2-the-sql/lib/src/generate-sql-ddl";
     import erDb from "@funktechno/little-mermaid-2-the-sql/lib/src/mermaid/src/diagrams/er/erDb";
     
     const db = erDb;
     
     let entityName = "Persons";
     // load mermaid db with entities
     db.addEntity(entityName);
     let attributes:DbEntityAttributesDefinition[] = [
       {
         attributeName: "PersonID",
         attributeKeyType: "PK",
         attributeType: "int",
         attributeComment: "NOT NULL"
       },
       {
         attributeName: "LastName",
         attributeType: "varchar255"
       },
       {
         attributeName: "FirstName",
         attributeType: "varchar255"
       },
       {
         attributeName: "Address",
         attributeType: "varchar255"
       },
       {
         attributeName: "City",
         attributeType: "varchar255"
       }
     ];
     db.addAttributes(entityName,attributes);
     
     entityName = "Orders";
     db.addEntity(entityName);
     attributes = [
       {
         attributeName: "OrderID",
         attributeKeyType: "PK",
         attributeType: "int",
         attributeComment: "NOT NULL"
       },
       {
         attributeName: "PersonID",
         attributeKeyType: "FK",
         attributeType: "int",
         attributeComment: "NOT NULL"
       }
     ];
     db.addAttributes(entityName,attributes);
     
     const relSpec:DbRelSpec= {
       cardA: "ZERO_OR_MORE",
       cardB: "ONLY_ONE",
       relType: "IDENTIFYING"
     };
     
     db.addRelationship("Persons", `[Persons.PersonId] to [${entityName}.PersonId]`, entityName, relSpec);
     const ddlSyntax = new DbParser('sqlite', db).getSQLDataDefinition();

   • sql output

     CREATE TABLE "Persons" (
       "City" varchar(255),
       "Address" varchar(255),
       "FirstName" varchar(255),
       "LastName" varchar(255),
       "PersonID" int NOT NULL,
       PRIMARY KEY("PersonID")
     );
     
     CREATE TABLE "Orders" (
       "PersonID" int NOT NULL,
       "OrderID" int NOT NULL,
       PRIMARY KEY("OrderID"),
       FOREIGN KEY ("PersonId") REFERENCES "Persons"("PersonId")
     );

Development

1. git clone repo
   1. run git submodule update --init --recursive --progress to clone submodule dependencies
2. run npm install inside directory.
3. Examples:
   1. sqlite npm run littleMermaid2SQL -- -d sqlite --src samples/chinook-database-2.0.1.md
   2. postgres npm run littleMermaid2SQL -- -d postgres --src samples/Adventureworks_pg.md
   3. mysql npm run littleMermaid2SQL -- -d mysql --src samples/Adventureworks_mysql.md
4. Force uninstall
   • npm uninstall -g little-mermaid-2-the-sql
   • npm list -g
   • littleMermaid2SQL --help
5. test npm packaging
   • update .npmignore
   • run npm pack unzip contents and verify, node_modules are not required b/c they will be installed with package.json
   • npm unpublish @funktechno/[email protected] can only work within 1 week of publish, not very useful b/c not possible to republish an unpublished version

Technologies

• esLint
• TypeScript
• Jest