feat: 为动态SQL添加泛型参数支持

[zhouyusd]

让动态SQL支持泛型参数

• Do only one thing
• Non breaking API changes
• Tested

What did this pull request do?

有的时候参数作为查询条件，零值是有意义的，需要实现nil的时候忽略该查询条件，尝试了泛型
原先gen版本只能解析到类型名，不带泛型参数

User Case Description

wrapper.go

package wrapper

type Wrapper[T any] struct {
	Value T
}

type UserQuerier interface {
  // SELECT * FROM users
  // {{ where }}
  //   {{ if status != nil }}status = @status.Value{{ end }}
  // {{ end }}
  GetUsers(status *wrapper.Wrapper[int]) ([]*gen.T, error)
}

原先生成效果

type IUserDo interface {
    ...

    GetUsers(status *Wrapper) ([]*model.User, error)
}

现在生成效果

type IUserDo interface {
    ...

    GetUsers(status *wrapper.Wrapper[int]) ([]*model.User, error)
}

[propel-code-bot]

Add generic-type awareness and pagination/count support to dynamic SQL generator

This PR is a substantial extension of gorm/gen that enables the code-generator to understand Go generic type parameters when parsing interfaces and to enrich dynamic SQL with SELECT / ORDER BY blocks plus built-in pagination & total-count handling. Core parsing, clause building, template generation, helper functions and public API are all updated while keeping existing APIs backward-compatible.

Key Changes

• Parser: new function astGetGenericType, extended handling for ast.IndexExpr / ast.IndexListExpr / ast.SelectorExpr; helper flags IsGenPage, IsCount to detect gen.Page and int64 count returns.
• Model: status enum now includes SELECT and ORDERBY; Page struct added to public API (generator.go) with GetLimit/GetOffset helpers.
• Clause system: deprecated SQLClause.Finish() in favour of SQLClause.Finishes(...bool) returning a slice of builder lines; new clause types SelectClause and OrderByClause with corresponding Create/Finishes implementations.
• Section builder: major refactor to parse new blocks, track order-by state, and emit multiple template lines via variadic appendTmpl; validation now forbids SELECT/ORDERBY without matching page/count usage.
• Templates: internal/template/method.go updated to emit pagination/record/count SQL builders using new helpers; supports conditional param slice and switched exec SQL var (recordSQL vs generateSQL).
• Helper utilities: added JoinRecordBuilder, JoinCountBuilder; modified JoinWhereBuilder and others for trimming.
• Generator: detects Page param and count result, wires pagination into generated code; propagates import paths and enhances error checks.
• Bug-fix: commit includes fallback to interface{} when astGetType returns empty, preventing malformed generic strings.
• Misc: extended validation in export.go, new enum constants, many small safety tweaks.

Affected Areas

• internal/parser/ – type parsing
• internal/generate/ – clause, section, interface processing, export
• internal/template/ – DIY and CRUD method templates
• helper/clause.go – SQL builder helpers
• generator.go public API
• internal/model enums & helpers

This summary was automatically generated by @propel-code-bot

[propel-code-bot]

LGTM, ship it! 🚢

Why was this auto-approved?

AI analysis completed with no actionable comments or suggestions.