Added MySQL System Catalogs

Makefile

@@ -29,6 +29,9 @@ sqlc-dev:
 sqlc-pg-gen:
 	go build -o ~/bin/sqlc-pg-gen ./internal/tools/sqlc-pg-gen
 
+sqlc-dolphin-gen:
+	go build -o ~/bin/sqlc-dolphin-gen ./internal/tools/sqlc-dolphin-gen
+
 sqlc-gen-json:
 	go build -o ~/bin/sqlc-gen-json ./cmd/sqlc-gen-json
 

internal/codegen/golang/result.go

@@ -3,6 +3,8 @@ package golang
 import (
 	"bufio"
 	"fmt"
+	"log"
+	"slices"
 	"sort"
 	"strings"
 
@@ -13,10 +15,27 @@ import (
 	"github.com/sqlc-dev/sqlc/internal/plugin"
 )
 
+// getSchemasToSkip Returns a list of schemas which should not be included in the generated output
+func getSchemasToSkip(req *plugin.GenerateRequest) []string {
+	switch req.Settings.Engine {
+	case "postgresql":
+		return []string{"pg_catalog", "information_schema"}
+	case "mysql":
+		return []string{"information_schema", "performance_schema", "sys", "mysql"}
+	case "sqlite":
+		return []string{}
+	default:
+		log.Printf("WARN internal/codegen/golang/result.go:getSchemasToSkip unhandled engine: %s\n", req.Settings.Engine)
+		return []string{}
+	}
+}
+
 func buildEnums(req *plugin.GenerateRequest, options *opts.Options) []Enum {
 	var enums []Enum
+	schemasToSkip := getSchemasToSkip(req)
+
 	for _, schema := range req.Catalog.Schemas {
-		if schema.Name == "pg_catalog" || schema.Name == "information_schema" {
+		if slices.Contains(schemasToSkip, schema.Name) {
 			continue
 		}
 		for _, enum := range schema.Enums {
@@ -62,8 +81,10 @@ func buildEnums(req *plugin.GenerateRequest, options *opts.Options) []Enum {
 
 func buildStructs(req *plugin.GenerateRequest, options *opts.Options) []Struct {
 	var structs []Struct
+	schemasToSkip := getSchemasToSkip(req)
+
 	for _, schema := range req.Catalog.Schemas {
-		if schema.Name == "pg_catalog" || schema.Name == "information_schema" {
+		if slices.Contains(schemasToSkip, schema.Name) {
 			continue
 		}
 		for _, table := range schema.Tables {

internal/engine/dolphin/catalog.go

@@ -4,13 +4,22 @@ import (
 	"github.com/sqlc-dev/sqlc/internal/sql/catalog"
 )
 
+// toPointer converts an int to a pointer without a temporary
+// variable at the call-site, and is used by the generated schemas
+func toPointer(x int) *int {
+	return &x
+}
+
 func NewCatalog() *catalog.Catalog {
 	def := "public" // TODO: What is the default database for MySQL?
-	return &catalog.Catalog{
-		DefaultSchema: def,
-		Schemas: []*catalog.Schema{
-			defaultSchema(def),
-		},
-		Extensions: map[string]struct{}{},
-	}
+
+	c := catalog.New(def)
+	// New() creates an empty schema which we'll replace with MySQL stdlib functions
+	c.Schemas[0] = defaultSchema(def)
+	c.Schemas = append(c.Schemas, genInformationSchema())
+	c.Schemas = append(c.Schemas, genPerformanceSchema())
+	c.Schemas = append(c.Schemas, genSysSchema())
+	c.Schemas = append(c.Schemas, genMysqlCatalog())
+
+	return c
 }