SqlMidway

A database gateway that automatically implements HTTP CRUD API based on SQL template configurations.

Similar to Elasticsearch search template.

---

Features

• SQL statements can be automatically generated and executed based on SQL template + JSON request parameters, and return JSON result.
• customize the format and number of response fields ('convert to underscore/lowerCamel/upperCamel', 'do not return specified fields', 'only return specified fields').
• use parameterized queries to prevent SQL injection, it can be used to quickly build small server-side projects.

---

How to use

Quick start

modify the 'dbs' parameters in 'config.yaml' to create a database connection named 'testDB' and configure three APIs for the database

# database information (multiple database can be configured)
dbs:

    # database name (custom, make sure it is unique)
  - name: testDB
    type: mysql
    dsn: root:123456@tcp(127.0.0.1:3306)/test_db?charset=utf8mb4&parseTime=True&loc=Local

    # API group information (multiple group can be configured)
    groups:
      
        # group name (custom, make sure it is unique in the DB)
      - name: testGroup
        # returned field name is changed to lower camel (support: lowerCamel,upperCamel,underscore)
        format: lowerCamel

        # API information (multiple API can be configured)
        apis:

            # API (1): /query/testDB/testGroup/listByIdOrName
            # API name (custom, make sure it is unique in the group)
          - name: listByIdOrName
            # sql template (similar to elasticsearch search template)
            sql: select * from test where 0=0 {#name} and name like {name} {/name} {#id} and id = {id} {/id} {#size} limit {size} {/size}

            # API (2): /query/testDB/testGroup/listByIds
          - name: listByIds
            sql: select * from test where id in {ids}

            # API (3): /command/testDB/testGroup/editNameById
          - name: editNameById
            sql: update test set name = {name} where id = {id} limit 1

Explanation of SQL template rules

• for example, template:

select * from test where 0=0 {#name} and name like {name} {/name} {#id} and id = {id} {/id}

• when the 'id' parameter is not specified, the statement '{#id} and id = {id} {/id}' will be eliminated at the time of execution
• when 'id' is passed in but 'name' is not passed, the SQL statement is generated as follows:

select * from test where 0=0 and id = ?

Start the project

• launch main.go

Access the API (1)

POST http://127.0.0.1:8899/query/testDB/testGroup/listByIdOrName

select URI: /query/{db.name}/{group.name}/{api.name} insert/update/delete URI: /command/{db.name}/{group.name}/{api.name}

• request

{
  "name": "%test%",
  "size": 10
}

• response

{
  "result": [
    {
      "createdAt": "2023-12-09T16:12:31+08:00",
      "id": 1,
      "name": "[test]data1",
      "status": 2,
      "tag": "test",
      "updatedAt": "2023-12-09T17:19:15+08:00"
    },
    {
      "createdAt": "2023-12-09T17:14:08+08:00",
      "id": 2,
      "name": "[test]data2",
      "status": 1,
      "tag": "test",
      "updatedAt": "2024-01-28T02:08:41+08:00"
    }
  ]
}

• if the request is a command request (with the /command/xxx/xxx/xxx/xxx api), the response structure is as follows:

{
  "result": {
    "rowsAffected": 0,
    "lastInsertId": 0
  }
}

• if the request is abnormal, an error message is returned, and the response structure is as follows:

{
  "error": "Error 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '{ids}' at line 1"
}

---

Control field returns (like Graphql)

Hide the 'id' and 'name' fields (URI with 'hide' parameter)

POST http://127.0.0.1:8899/query/testDB/testGroup/listByIdOrName?hide=id,name

• request

{
  "id": 1
}

• response

{
  "result": [
    {
      "createdAt": "2023-12-09T16:12:31+08:00",
      "status": 2,
      "tag": "test",
      "updatedAt": "2023-12-09T17:19:15+08:00"
    }
  ]
}

Format the return field as upper camel, only the 'Id' and 'Name' fields are returned (URI with 'format' and 'shaw' parameters)

POST http://127.0.0.1:8899/query/testDB/testGroup/listByIdOrName?format=upperCamel&show=Id,Name

• request

{
  "id": 1
}

• response

{
  "result": [
    {
      "Id": 1,
      "Name": "[test]data1"
    }
  ]
}

---

Support 'in' query

Pass in the array parameters

• sql template

sql: select * from test where id in {ids}

• request

{
  "ids": [
    1,
    2
  ]
}

---

View the logs

• /logs/runtime.log

---

APIs

SELECT

POST http://127.0.0.1:8899/query/{db.name}/{group.name}/{api.name}

INSERT UPDATE DELETE

POST http://127.0.0.1:8899/command/{db.name}/{group.name}/{api.name}

OTHER

GET http://127.0.0.1:8899/info

GET http://127.0.0.1:8899/health