WIP: OrderBy implementation

exec/select.go

@@ -98,10 +98,11 @@ func (s *Select[T]) execute(conn *simpleorm.DBConnection, tx *sql.Tx) error {
 	}
 
 	if len(s.ordering) > 0 {
-		dml += " ORDER BY"
-		for _, orderBy := range s.ordering {
-
-			dml += " " + orderBy.Field + " " + orderBy.Direction
+		orderBy, err := s.target.GetOrderByDML(s.ordering...)
+		if err != nil {
+			log.LogError("Failed to create ORDER BY part: %s", err)
+		} else {
+			dml += orderBy
 		}
 	}
 

schema/table.go

@@ -1,6 +1,7 @@
 package schema
 
 import (
+	"errors"
 	"reflect"
 	"strings"
 
@@ -218,6 +219,31 @@ func (t Table) GetDeleteDML(count int) (string, error) {
 	return dml.String(), nil
 }
 
+func (t Table) GetOrderByDML(ordering ...OrderBy) (string, error) {
+	var dml strings.Builder
+	dml.WriteString(" ORDER BY")
+	for _, orderBy := range ordering {
+		col, err := t.getColumnByField(orderBy.Field)
+		if err != nil {
+			return "", err
+		}
+		dml.WriteString(" ")
+		dml.WriteString(col.Name)
+		dml.WriteString(" ")
+		dml.WriteString(orderBy.Direction)
+	}
+	return dml.String(), nil
+}
+
+func (t Table) getColumnByField(fieldName string) (Column, error) {
+	for _, col := range t.columns {
+		if col.FieldName == fieldName {
+			return col, nil
+		}
+	}
+	return Column{}, errors.New("No column for field " + fieldName + " in table " + t.name)
+}
+
 func (t Table) IsPkAuto() bool {
 	for _, constr := range t.constraints {
 		if constr.Type != "pk" {

test/select_test.go

@@ -4,6 +4,7 @@ import (
 	"strconv"
 	"testing"
 
+	simpleorm "git.gdulai.com/gdulai/simpleorm"
 	"git.gdulai.com/gdulai/simpleorm/exec"
 	"git.gdulai.com/gdulai/simpleorm/schema"
 	log "gitlab.com/gdulai/simpleloglvl"
@@ -277,35 +278,22 @@ func TestSelectWithLimitAndOffset(t *testing.T) {
 	}
 }
 
-func TestSelectOrderBy(t *testing.T) {
+func TestSelectOrderByDesc(t *testing.T) {
 	// GIVEN
 	orm, conn := testSetup()
 	defer cleanUp("test.db", conn)
 
-	testA := Test{Int64Field: -1, IntField: 1, StringField: "A"}
-	testB := Test{Int64Field: -1, IntField: 1, StringField: "B"}
-	testC := Test{Int64Field: -1, IntField: 1, StringField: "C"}
-	testD := Test{Int64Field: -1, IntField: 1, StringField: "D"}
-	testE := Test{Int64Field: -1, IntField: 1, StringField: "E"}
-
-	insertExec, err := exec.NewInsert[Test](orm, testA, testB, testC, testD, testE)
+	err := orderBySetup(conn, orm)
 	if err != nil {
-		log.LogError("TestSelectOrderBy setup failed: %s", err)
+		log.LogError("TestSelectOrderByAsc setup failed: %s", err)
 		t.Fail()
 		return
 	}
 
-	err = insertExec.Execute(conn)
-	if err != nil {
-		log.LogError("TestSelectOrderBy setup failed: %s", err)
-		t.Fail()
-		return
-	}
 	// WHEN
-
 	selectExec, err := exec.CreateSelect[Test](orm)
 	if err != nil {
-		log.LogError("TestSelectOrderBy failed: %s", err)
+		log.LogError("TestSelectOrderByDesc failed: %s", err)
 		t.Fail()
 		return
 	}
@@ -313,7 +301,47 @@ func TestSelectOrderBy(t *testing.T) {
 
 	err = selectExec.Execute(conn)
 	if err != nil {
-		log.LogError("TestSelectOrderBy failed: %s", err)
+		log.LogError("TestSelectOrderByDesc failed: %s", err)
+		t.Fail()
+		return
+	}
+
+	// THEN
+	var resultStr string
+	for _, obj := range selectExec.Results() {
+		resultStr += obj.StringField
+	}
+
+	if resultStr != "EDCBA" {
+		log.LogError("TestSelectOrderByDesc failed, epxected: EDCBA actual: %s", resultStr)
+		t.Fail()
+	}
+}
+
+func TestSelectOrderByAsc(t *testing.T) {
+	// GIVEN
+	orm, conn := testSetup()
+	defer cleanUp("test.db", conn)
+
+	err := orderBySetup(conn, orm)
+	if err != nil {
+		log.LogError("TestSelectOrderByAsc setup failed: %s", err)
+		t.Fail()
+		return
+	}
+
+	// WHEN
+	selectExec, err := exec.CreateSelect[Test](orm)
+	if err != nil {
+		log.LogError("TestSelectOrderByAsc failed: %s", err)
+		t.Fail()
+		return
+	}
+	selectExec.OrderBy(schema.OrderBy{Field: "StringField", Direction: "ASC"})
+
+	err = selectExec.Execute(conn)
+	if err != nil {
+		log.LogError("TestSelectOrderByAsc failed: %s", err)
 		t.Fail()
 		return
 	}
@@ -325,7 +353,27 @@ func TestSelectOrderBy(t *testing.T) {
 	}
 
 	if resultStr != "ABCDE" {
-		log.LogError("TestSelectOrderBy failed, epxected: ABCDE actual: %s", resultStr)
+		log.LogError("TestSelectOrderByAsc failed, epxected: ABCDE actual: %s", resultStr)
 		t.Fail()
 	}
 }
+
+func orderBySetup(conn *simpleorm.DBConnection, orm *simpleorm.ORM) error {
+	insertExec, err := exec.NewInsert[Test](orm,
+		Test{Int64Field: -1, IntField: 1, StringField: "C"},
+		Test{Int64Field: -1, IntField: 1, StringField: "D"},
+		Test{Int64Field: -1, IntField: 1, StringField: "E"},
+		Test{Int64Field: -1, IntField: 1, StringField: "A"},
+		Test{Int64Field: -1, IntField: 1, StringField: "B"},
+	)
+	if err != nil {
+		return err
+	}
+
+	err = insertExec.Execute(conn)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}