sql/mysql: add support for column-level auto_increment

schema/schemaspec/spec.go

@@ -112,7 +112,7 @@ func (a *Attr) Int() (int, error) {
 	}
 	s, err := strconv.Atoi(lit.V)
 	if err != nil {
-		return 0, fmt.Errorf("schema: cannot read attribute %q as integer", a.K)
+		return 0, fmt.Errorf("schema: cannot read attribute %q as int: %w", a.K, err)
 	}
 	return s, nil
 }
@@ -131,7 +131,11 @@ func (a *Attr) Bool() (bool, error) {
 	if !ok {
 		return false, fmt.Errorf("schema: cannot read attribute %q as literal", a.K)
 	}
-	return strconv.ParseBool(lit.V)
+	b, err := strconv.ParseBool(lit.V)
+	if err != nil {
+		return false, fmt.Errorf("schema: cannot read attribute %q as bool: %w", a.K, err)
+	}
+	return b, nil
 }
 
 // Ref returns the string representation of the Attr. If the value is not a Ref or the value

sql/mysql/sqlspec.go

@@ -140,6 +140,15 @@ func convertColumn(spec *sqlspec.Column, _ *schema.Table) (*schema.Column, error
 		}
 		c.AddAttrs(&OnUpdate{A: exp.X})
 	}
+	if attr, ok := spec.Attr("auto_increment"); ok {
+		b, err := attr.Bool()
+		if err != nil {
+			return nil, err
+		}
+		if b {
+			c.AddAttrs(&AutoIncrement{})
+		}
+	}
 	return c, err
 }
 

sql/mysql/sqlspec_test.go

@@ -23,9 +23,11 @@ table "table" {
 	}
 	column "price1" {
 		type = int
+		auto_increment = false
 	}
 	column "price2" {
 		type = int
+		auto_increment = true
 	}
 	column "account_name" {
 		type = varchar(32)
@@ -136,6 +138,7 @@ table "accounts" {
 							T: TypeInt,
 						},
 					},
+					Attrs: []schema.Attr{&AutoIncrement{}},
 				},
 				{
 					Name: "account_name",