New

internal/db/dialect/dialect.go

@@ -0,0 +1,14 @@
+// Filename: internal/db/dialect/dialect.go
+package dialect
+
+import (
+	"gorm.io/gorm/clause"
+)
+
+// “通用语言”接口。
+type DialectAdapter interface {
+	// OnConflictUpdateAll 生成一个完整的、适用于当前数据库的 "ON CONFLICT DO UPDATE" 子句。
+	// conflictColumns: 唯一的约束列，例如 ["time", "group_id", "model_name"]
+	// updateColumns:   需要累加更新的列，例如 ["request_count", "success_count", ...]
+	OnConflictUpdateAll(conflictColumns []string, updateColumns []string) clause.Expression
+}

internal/db/dialect/mysql_adapter.go

@@ -0,0 +1,30 @@
+// Filename: internal/db/mysql_adapter.go
+package dialect
+
+import (
+	"gorm.io/gorm"
+	"gorm.io/gorm/clause"
+)
+
+type mysqlAdapter struct{}
+
+func NewMySQLAdapter() DialectAdapter {
+	return &mysqlAdapter{}
+}
+
+func (a *mysqlAdapter) OnConflictUpdateAll(conflictColumns []string, updateColumns []string) clause.Expression {
+	conflictCols := make([]clause.Column, len(conflictColumns))
+	for i, col := range conflictColumns {
+		conflictCols[i] = clause.Column{Name: col}
+	}
+
+	assignments := make(map[string]interface{})
+	for _, col := range updateColumns {
+		assignments[col] = gorm.Expr(col + " + VALUES(" + col + ")")
+	}
+
+	return clause.OnConflict{
+		Columns:   conflictCols,
+		DoUpdates: clause.Assignments(assignments),
+	}
+}

internal/db/dialect/postgres_adapter.go

@@ -0,0 +1,30 @@
+// Filename: internal/db/dialect/postgres_adapter.go (全新文件)
+package dialect
+
+import (
+	"gorm.io/gorm"
+	"gorm.io/gorm/clause"
+)
+
+type postgresAdapter struct{}
+
+func NewPostgresAdapter() DialectAdapter {
+	return &postgresAdapter{}
+}
+
+func (a *postgresAdapter) OnConflictUpdateAll(conflictColumns []string, updateColumns []string) clause.Expression {
+	conflictCols := make([]clause.Column, len(conflictColumns))
+	for i, col := range conflictColumns {
+		conflictCols[i] = clause.Column{Name: col}
+	}
+
+	assignments := make(map[string]interface{})
+	for _, col := range updateColumns {
+		assignments[col] = gorm.Expr(col + " + excluded." + col)
+	}
+
+	return clause.OnConflict{
+		Columns:   conflictCols,
+		DoUpdates: clause.Assignments(assignments),
+	}
+}

internal/db/dialect/sqlite_adapter.go

@@ -0,0 +1,30 @@
+// Filename: internal/db/sqlite_adapter.go (全新文件 - 最终版)
+package dialect
+
+import (
+	"gorm.io/gorm"
+	"gorm.io/gorm/clause"
+)
+
+type sqliteAdapter struct{}
+
+func NewSQLiteAdapter() DialectAdapter {
+	return &sqliteAdapter{}
+}
+
+func (a *sqliteAdapter) OnConflictUpdateAll(conflictColumns []string, updateColumns []string) clause.Expression {
+	conflictCols := make([]clause.Column, len(conflictColumns))
+	for i, col := range conflictColumns {
+		conflictCols[i] = clause.Column{Name: col}
+	}
+
+	assignments := make(map[string]interface{})
+	for _, col := range updateColumns {
+		assignments[col] = gorm.Expr(col + " + excluded." + col)
+	}
+
+	return clause.OnConflict{
+		Columns:   conflictCols,
+		DoUpdates: clause.Assignments(assignments),
+	}
+}