protoc-gen-go-sqlmap:

This is a protobuf-plugin based on gogo to generate SQL-Select mappers in go. In future insert and updates should also be supported.

Usage:

• Clone this repo (churrently you should checkout dev)
• use the make install to install protoc-gen-go-sqlmap into your $GOPATH
• in protoc you can now use --go-sqlmap_out=.

To make use of this plugin, add following extensions to you .proto-file:

import "github.com/roderm/protoc-gen-go-sqlmap/sqlgen/sqlgen.proto" // Import of the extensions

message Some {
    option (sqlgen.table) = {name:"tbl_some", crud:[R]}; // table name and generate read-function
    string Id = 1 [(sqlgen.dbpk) = AUTO, (sqlgeb.dbcol) = "some_id"]; // It's an autogenerated key in the field "some_id"
    repeated Attribute Attributes = 2; [(sqlgeb.dbcol) = "some_id", (sqlgen.dbfk) = "tbl_some_attributes.some_id"]; // Make a one-to-many link to load
}

message Attribute {
    option (sqlgen.table) = {name:"tbl_some_attributes", crud:[C,R,D]}; // genereate inser,select and delete function
    string Id = 1 [(sqlgen.dbpk) = AUTO, (sqlgeb.dbcol) = "attributes_id"];
    string Name = 2 [(sqlgeb.dbcol) = "attributes_name"];
    bytes Value = 3 [(sqlgeb.dbcol) = "attributes_value"];
    Some Parent = 4 [(sqlgeb.dbcol) = "some_id", (sqlgeb.dbfk) = "tbl_some.some_id"]; // Make a one-to-one link to load
}

After generation of the .sqlmap.go-file you should be able to load the data as following:

store = package.NewStore(db_conn)
rows, err = store.Some(context.TODO(), package.SomeWithAttributes())

Additional there can be given extra parameters for filtering (Currently only forks for Postgres/Cockroach): store.Some(context.TODO(), SomeFilter(pg.EQ("some_id", "some_id")) or for the sub-query: store.Some(context.TODO(), package.SomeWithAttributes(AttributeFilter(pg.EQ("name", "FirstArgument")))

Roadmap:

• [x] Implement loading of one-to-many
• [x] Implement loading of one-to-many
• [x] Implement insert
• [x] Implement delete
• [ ] Implement update
• [-] Write generator test
• [ ] Support multiple PKs
• [ ] Add multiple FKs for single Message
• [ ] Support oneOf type in proto3
• [ ] Load external messages to resolve foreign keys
• [ ] Implement other Database-Syntax
  • [x] CockroachDB
  • [ ] PostgreSQL
  • [ ] MySQL / MariaDB

Gotcha's

• Proto Import: github.com/gogo/protobuf/protobuf/google/protobuf/descriptor.proto
• actual go-package: github.com/gogo/protobuf/protoc-gen-gogo/descriptor => fixed with gofast_out=Mgoogle/protobuf/descriptor.proto=github.com/gogo/protobuf/protoc-gen-gogo/descriptor:.