feat: complete contract-driven business development and MySQL integration

examples/contracts/business.api

@@ -0,0 +1,61 @@
+syntax = "v1"
+@app (
+    defaultResponse: CommonResponse
+    request: {"unknownQuery":"reject","utf8":"reject","charset":"utf8"}
+)
+response CommonResponse (
+    codeType: int32
+    successCode: 0
+    errorCode: 9999
+    messageField: msg
+    dataMode: always
+    requestIdField: "-"
+)
+type Item {
+    Name string `json:"name"`
+}
+type Query {
+    Mode string   `form:"mode,optional"`
+    Tags []string `form:"tags,optional"`
+}
+type Upload {
+    Title      string `multipart:"title" binding:"required,max=20"`
+    Metadata   Item   `multipartJSON:"metadata"`
+    Attachment File   `file:"attachment,maxBytes=1024"`
+    Extras     []File `file:"extras,optional,maxFiles=2,maxBytes=512"`
+}
+@server (group: demo; middleware: RequireAccess)
+service business {
+    @handler upload
+    @body (mode: multipart; maxBytes: 4096; maxParts: 6; maxFieldBytes: 128)
+    post /upload (Upload) returns (Item)
+
+    @handler list
+    get /list (Query) returns ([]Item)
+    @handler nullable
+    get /nullable (Query) returns (*Item)
+    @handler nothing
+    post /nothing returns (null)
+    @handler rawNull
+    @response raw
+    get /rawNull returns (null)
+    @handler rawArray
+    @response raw
+    get /rawArray returns ([]Item)
+    @handler empty
+    @request (body: emptyObject)
+    post /empty returns (null)
+    @handler absent
+    @request (body: none)
+    post /absent returns (null)
+    @handler optional
+    @request (body: optional)
+    post /optional (Item) returns (Item)
+    @handler echo
+    post /echo (Item) returns (Item)
+    @handler tolerant
+    @request (unknownQuery: ignore; utf8: replace; charset: any)
+    post /tolerant (Item) returns (Item)
+    @handler noContent
+    delete /noContent
+}