WIP: OrderBy implementation

cache/cache.go

@@ -25,7 +25,7 @@ func NewSchemaCache(tables []*schema.Table) *SchemaCache {
 func (o *SchemaCache) add(table *schema.Table) {
 	o.mu.Lock()
 	defer o.mu.Unlock()
-	o.data[table.Type.Name()] = table
+	o.data[table.Type().Name()] = table
 }
 
 func (o *SchemaCache) Get(typeName string) (*schema.Table, bool) {

exec/exec.go

@@ -157,100 +157,6 @@ type Exec[T any] interface {
 	execute(conn *simpleorm.DBConnection, tx *sql.Tx) error
 }
 
-type Select[T any] struct {
-	target    schema.Table
-	whereStmt string
-	args      []any
-	results   []T
-	Limit     int64
-	Offset    int64
-}
-
-func CreateSelect[T any](orm *simpleorm.ORM, whereStmt string, args ...any) (Select[T], error) {
-	table, ok := orm.Cache().Get(reflect.TypeFor[T]().Name())
-	if !ok {
-		return Select[T]{}, errors.New("Failed to get table from schema cache")
-	}
-
-	return Select[T]{target: *table, whereStmt: whereStmt, args: args, Limit: -1, Offset: -1}, nil
-}
-
-func (s *Select[T]) Results() []T {
-	return s.results
-}
-
-func (s *Select[T]) Execute(conn *simpleorm.DBConnection) error {
-	return s.execute(conn, nil)
-}
-
-func (s *Select[T]) execute(conn *simpleorm.DBConnection, tx *sql.Tx) error {
-	// Reinit the results, new execution
-	s.results = []T{}
-	dml, err := s.target.GetSelectDML()
-	if err != nil {
-		return err
-	}
-
-	if s.whereStmt != "" {
-		dml += " WHERE " + s.whereStmt
-	}
-
-	var effectiveArgs []any = s.args
-	if s.Limit != -1 {
-		dml += " LIMIT ?"
-		effectiveArgs = append(effectiveArgs, s.Limit)
-	}
-
-	if s.Offset != -1 {
-		dml += " OFFSET ?"
-		effectiveArgs = append(effectiveArgs, s.Offset)
-	}
-
-	log.LogDebug("Preparing sql: %s, with args: %s", dml, effectiveArgs)
-
-	var stmt *sql.Stmt
-	if tx != nil {
-		stmt, err = tx.Prepare(dml)
-	} else {
-		stmt, err = conn.Prepare(dml)
-	}
-
-	if err != nil {
-		return err
-	}
-	defer stmt.Close()
-
-	log.LogDebug("Executing statement: %s", stmt)
-
-	var rows *sql.Rows
-	if len(effectiveArgs) == 0 {
-		rows, err = stmt.Query()
-	} else {
-		// Flattent args to make sure it can be parsed correctly
-		var flatArgs []any
-		for _, a := range effectiveArgs {
-			if s, ok := a.([]any); ok {
-				flatArgs = append(flatArgs, s...)
-			} else {
-				flatArgs = append(flatArgs, a)
-			}
-		}
-		rows, err = stmt.Query(flatArgs...)
-
-	}
-
-	if err != nil {
-		return err
-	}
-
-	s.results, err = readRows[T](s.target, rows)
-	if err != nil {
-		return err
-	}
-
-	return nil
-}
-
 type Count[T any] struct {
 	target    schema.Table
 	whereStmt string
@@ -514,9 +420,10 @@ func (d *Delete[T]) execute(conn *simpleorm.DBConnection, tx *sql.Tx) error {
 }
 
 func createSelectResultContainer(t schema.Table) []any {
-	vals := make([]any, t.Type.NumField())
+	typ := t.Type()
+	vals := make([]any, typ.NumField())
 	for i := range vals {
-		switch t.Type.Field(i).Type.Kind().String() {
+		switch typ.Field(i).Type.Kind().String() {
 		case "string":
 			var fieldContainer string
 			vals[i] = &fieldContainer
@@ -532,13 +439,14 @@ func createSelectResultContainer(t schema.Table) []any {
 }
 
 func prepareParams(src any, t schema.Table) []any {
+	typ := t.Type()
 	var params []any
-	for _, col := range t.Columns {
+	for _, col := range t.Columns() {
 		_, ok := col.Modifiers["pk"]
 		if ok && t.IsPkAuto() {
 			continue
 		}
-		field, ok := t.Type.FieldByName(col.FieldName)
+		field, ok := typ.FieldByName(col.FieldName)
 		if !ok {
 			continue
 		}
@@ -550,11 +458,12 @@ func prepareParams(src any, t schema.Table) []any {
 }
 
 func getPk(src any, t schema.Table) ([]any, error) {
+	typ := t.Type()
 	var values []any
-	for _, constraint := range t.Constraints {
+	for _, constraint := range t.Constraints() {
 		if constraint.Type == "pk" {
 			for _, col := range constraint.Columns {
-				field, ok := t.Type.FieldByName(col.FieldName)
+				field, ok := typ.FieldByName(col.FieldName)
 				if !ok {
 					continue
 
@@ -582,10 +491,11 @@ func readRows[T any](table schema.Table, rows *sql.Rows) ([]T, error) {
 			return nil, err
 		}
 
-		targetType := table.Type
+		targetType := table.Type()
+		cols := table.Columns()
 		parsedResult := reflect.New(targetType)
 		for i, fieldVal := range rowContainer {
-			col := table.Columns[i]
+			col := cols[i]
 			targetField := parsedResult.Elem().Field(i)
 
 			rawValue := reflect.Indirect(reflect.ValueOf(fieldVal))

exec/select.go

@@ -0,0 +1,153 @@
+package exec
+
+import (
+	"database/sql"
+	"errors"
+	"reflect"
+
+	"git.gdulai.com/gdulai/simpleorm"
+	"git.gdulai.com/gdulai/simpleorm/schema"
+	log "gitlab.com/gdulai/simpleloglvl"
+)
+
+// Select execution which is translated to a select sql query.
+type Select[T any] struct {
+	target    schema.Table
+	whereStmt string
+	args      []any
+	limit     int64
+	offset    int64
+	ordering  []schema.OrderBy
+	results   []T
+}
+
+// Creates the select query builder
+func CreateSelect[T any](orm *simpleorm.ORM) (Select[T], error) {
+	table, ok := orm.Cache().Get(reflect.TypeFor[T]().Name())
+	if !ok {
+		return Select[T]{}, errors.New("Failed to get table from schema cache")
+	}
+
+	return Select[T]{target: *table, limit: -1, offset: -1}, nil
+}
+
+// Sets the where part of the select query and the arguments
+// Returns the pointer of the Select instance
+func (s *Select[T]) Where(whereStmt string, args ...any) *Select[T] {
+	s.whereStmt = whereStmt
+	s.args = args
+	return s
+}
+
+// Sets the limit part of the select query
+// Returns the pointer of the Select instance
+func (s *Select[T]) Limit(limit int64) *Select[T] {
+	s.limit = limit
+	return s
+}
+
+// Sets the offset part of the select query
+// Returns the pointer of the Select instance
+func (s *Select[T]) Offset(offset int64) *Select[T] {
+	s.offset = offset
+	return s
+}
+
+// Sets the order by part of the select query
+// Returns the pointer of the Select instance
+func (s *Select[T]) OrderBy(ordering ...schema.OrderBy) *Select[T] {
+	s.ordering = ordering
+	return s
+}
+
+// Returns the result of the select
+func (s *Select[T]) Results() []T {
+	return s.results
+}
+
+// Executes the select query based on the Select exec instance
+// Returns an error if theres any
+func (s *Select[T]) Execute(conn *simpleorm.DBConnection) error {
+	return s.execute(conn, nil)
+}
+
+// Executes the select query based on the Select exec instance
+// If tx is given, the transaction is used instead of the conn
+// Returns an error if theres any
+func (s *Select[T]) execute(conn *simpleorm.DBConnection, tx *sql.Tx) error {
+	// Reinit the results, new execution
+	s.results = []T{}
+	dml, err := s.target.GetSelectDML()
+	if err != nil {
+		return err
+	}
+
+	if s.whereStmt != "" {
+		dml += " WHERE " + s.whereStmt
+	}
+
+	var effectiveArgs []any = s.args
+	if s.limit != -1 {
+		dml += " LIMIT ?"
+		effectiveArgs = append(effectiveArgs, s.limit)
+	}
+
+	if s.offset != -1 {
+		dml += " OFFSET ?"
+		effectiveArgs = append(effectiveArgs, s.offset)
+	}
+
+	if len(s.ordering) > 0 {
+		orderBy, err := s.target.GetOrderByDML(s.ordering...)
+		if err != nil {
+			log.LogError("Failed to create ORDER BY part: %s", err)
+		} else {
+			dml += orderBy
+		}
+	}
+
+	log.LogInfo("Preparing sql: %s", dml)
+	log.LogDebug("Preparing sql: %s, with args: %s", dml, effectiveArgs)
+
+	var stmt *sql.Stmt
+	if tx != nil {
+		stmt, err = tx.Prepare(dml)
+	} else {
+		stmt, err = conn.Prepare(dml)
+	}
+
+	if err != nil {
+		return err
+	}
+	defer stmt.Close()
+
+	log.LogDebug("Executing statement: %s", stmt)
+
+	var rows *sql.Rows
+	if len(effectiveArgs) == 0 {
+		rows, err = stmt.Query()
+	} else {
+		// Flattent args to make sure it can be parsed correctly
+		var flatArgs []any
+		for _, a := range effectiveArgs {
+			if s, ok := a.([]any); ok {
+				flatArgs = append(flatArgs, s...)
+			} else {
+				flatArgs = append(flatArgs, a)
+			}
+		}
+		rows, err = stmt.Query(flatArgs...)
+
+	}
+
+	if err != nil {
+		return err
+	}
+
+	s.results, err = readRows[T](s.target, rows)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}

orm.go

@@ -7,7 +7,6 @@ import (
 	"strings"
 
 	"git.gdulai.com/gdulai/simpleorm/cache"
-	"git.gdulai.com/gdulai/simpleorm/parser"
 	"git.gdulai.com/gdulai/simpleorm/schema"
 
 	log "gitlab.com/gdulai/simpleloglvl"
@@ -21,28 +20,39 @@ type ORM struct {
 // Inits the ORM library.
 // Param objs is an array which should be an array of the types which describe the tables.
 func NewORM(objs ...any) *ORM {
-	var parsers []*parser.Parser
+	typeParsers := make(map[string]*schema.Parser)
-	var tables []*schema.Table
+
+	log.LogDebug("[ORM] Parsing entities to tables...")
+	log.LogDebug("[ORM] Step 1: Parsing table columns")
 	for _, obj := range objs {
-		log.LogDebug("[ORM] Mapping type for: %s", reflect.TypeOf(obj).Name())
+		typ := reflect.TypeOf(obj)
-		parser := parser.NewParser(obj)
+		log.LogDebug("[ORM] Mapping type for: %s", typ.Name())
-		parsers = append(parsers, parser)
+
-		tables = append(tables, parser.ParseColumns())
+		parser := schema.NewParser(obj)
+		parser.ParseColumns()
+
+		typeParsers[typ.Name()] = parser
 	}
 
-	log.LogDebug("[ORM] Tables initiated, creating cache.")
+	log.LogDebug("[ORM] Step 1: Finished parsing columns!")
+	log.LogDebug("[ORM] Step 2: Parsing constraints...")
+
+	for _, parser := range typeParsers {
+		parser.ParseConstraints(typeParsers)
+	}
+
+	log.LogDebug("[ORM] Step 2: Finished parsing contraints!")
+	log.LogDebug("[ORM] Step 3: Creating and caching schema...")
+
+	var tables []*schema.Table
+	for _, parser := range typeParsers {
+		tables = append(tables, parser.ParseTable())
+	}
 
 	// Create cache with the initialized tables
 	cache := cache.NewSchemaCache(tables)
 
-	log.LogDebug("[ORM] Cache created.")
+	log.LogDebug("[ORM] Step 3: Cache created.")
-
-	// Finish the parsing with the constraints and add the to the tables
-	for _, parser := range parsers {
-		log.LogDebug("[ORM] Parsing constraing for: %s", parser.Table.Name)
-		parser.ParseConstraints(cache)
-		log.LogDebug("[ORM] Parsed constraints for: %s", parser.Table.Name)
-	}
 
 	return &ORM{cache: cache}
 }

parser/parser.go

@@ -1,101 +0,0 @@
-package parser
-
-import (
-	"reflect"
-	"strings"
-
-	cache "git.gdulai.com/gdulai/simpleorm/cache"
-	"git.gdulai.com/gdulai/simpleorm/schema"
-	"git.gdulai.com/gdulai/simpleorm/util"
-	log "gitlab.com/gdulai/simpleloglvl"
-)
-
-type Parser struct {
-	typ   reflect.Type
-	Table *schema.Table
-}
-
-func NewParser[T any](obj T) *Parser {
-	objType := reflect.TypeOf(obj)
-	return &Parser{typ: objType}
-}
-
-// This is step 1 of the parsing, it creates the table instance and
-func (p *Parser) ParseColumns() *schema.Table {
-	table := schema.Table{Name: util.CamelToSnake(p.typ.Name()), Type: p.typ}
-
-	var columns []schema.Column
-	for field := range p.typ.Fields() {
-		field := field
-		col := schema.NewColumn(util.CamelToSnake((field.Name)), field.Name, determineType(field.Type), field.Tag)
-		columns = append(columns, col)
-	}
-
-	table.Columns = columns
-	p.Table = &table
-	return p.Table
-}
-
-func (p *Parser) ParseConstraints(cache *cache.SchemaCache) {
-	pkConstraint := schema.Constraint{Name: "pk_" + strings.ToLower(p.Table.Name), Type: "pk"}
-	fkConstraints := make(map[string]schema.Constraint)
-	for _, col := range p.Table.Columns {
-		_, ok := col.Modifiers["pk"]
-		if ok {
-			pkConstraint.Columns = append(pkConstraint.Columns, col)
-			continue
-		}
-
-		fkMod, ok := col.Modifiers["fk"]
-		if !ok {
-			continue
-		}
-
-		fkModParts := strings.Split(fkMod, ".")
-		refTable, ok := cache.Get(fkModParts[0])
-		if !ok {
-			log.LogError("[ORM] Table %s not found in OrmCache!", fkModParts[0])
-			return
-		}
-
-		fkId, ok := col.Modifiers["fk_id"]
-		if fkId == "" {
-			fkId = "fk_" + strings.ToLower(refTable.Name)
-		}
-
-		fkConstraint, ok := fkConstraints[fkId]
-		if !ok {
-			fkConstraint = schema.Constraint{Name: fkId, Type: "fk", RefTable: refTable}
-		}
-
-		fkConstraint.Columns = append(fkConstraint.Columns, col)
-
-		refField := fkModParts[1]
-		for _, refC := range refTable.Columns {
-			if refC.FieldName == refField {
-				fkConstraint.RefColumns = append(fkConstraint.RefColumns, refC)
-			}
-		}
-
-		fkConstraints[fkId] = fkConstraint
-	}
-	p.Table.Constraints = append(p.Table.Constraints, pkConstraint)
-	for _, fkConstraint := range fkConstraints {
-		p.Table.Constraints = append(p.Table.Constraints, fkConstraint)
-	}
-
-}
-
-func determineType(typ reflect.Type) string {
-	typStr := typ.String()
-	switch typStr {
-	case "string":
-		return "TEXT"
-	case "int", "bool":
-		return "INTEGER"
-	case "time.Time", "int64":
-		return "BIGINT"
-	}
-
-	return "VARCHAR(255)"
-}

repository/repository.go

@@ -23,7 +23,7 @@ func NewRepository[T HasPK](conn *simpleorm.DBConnection, orm *simpleorm.ORM) *R
 }
 
 func (r *Repository[T]) SelectAll() []*T {
-	selectExec, err := exec.CreateSelect[T](r.orm, "")
+	selectExec, err := exec.CreateSelect[T](r.orm)
 	if err != nil {
 		log.LogError("Failed to create select execution: %s", err)
 		return []*T{}
@@ -53,7 +53,7 @@ func (r *Repository[T]) SelectByPk(pks ...any) *T {
 
 	var whereStmtBuilder strings.Builder
 
-	for _, constr := range table.Constraints {
+	for _, constr := range table.Constraints() {
 		if constr.Type != "pk" {
 			continue
 		}
@@ -68,12 +68,14 @@ func (r *Repository[T]) SelectByPk(pks ...any) *T {
 
 	}
 
-	selectExec, err := exec.CreateSelect[T](r.orm, whereStmtBuilder.String(), pks)
+	selectExec, err := exec.CreateSelect[T](r.orm)
 	if err != nil {
 		log.LogError("Failed to create select execution: %s", err)
 		return nil
 	}
 
+	selectExec.Where(whereStmtBuilder.String(), pks)
+
 	err = selectExec.Execute(r.conn)
 	if err != nil {
 		log.LogError("Failed to load entity: %s", err)

schema/constraint.go

@@ -3,14 +3,16 @@ package schema
 import (
 	"errors"
 	"strings"
+
+	"git.gdulai.com/gdulai/simpleorm/util"
 )
 
 type Constraint struct {
-	Name       string
+	Name        string
-	Type       string
+	Type        string
-	Columns    []Column
+	Columns     []Column
-	RefTable   *Table
+	RefTypeName string
-	RefColumns []Column
+	RefColumns  []Column
 }
 
 func (c *Constraint) GetDDL() (string, error) {
@@ -26,7 +28,9 @@ func (c *Constraint) GetDDL() (string, error) {
 
 func (c *Constraint) getPkDDL() string {
 	var ddl strings.Builder
-	ddl.WriteString("CONSTRAINT " + c.Name + " PRIMARY KEY(")
+	ddl.WriteString("CONSTRAINT ")
+	ddl.WriteString(c.Name)
+	ddl.WriteString(" PRIMARY KEY(")
 	for i, col := range c.Columns {
 		if i != 0 {
 			ddl.WriteString(", ")
@@ -39,7 +43,9 @@ func (c *Constraint) getPkDDL() string {
 
 func (c *Constraint) getFkDDL() string {
 	var ddl strings.Builder
-	ddl.WriteString("CONSTRAINT " + c.Name + " FOREIGN KEY(")
+	ddl.WriteString("CONSTRAINT ")
+	ddl.WriteString(c.Name)
+	ddl.WriteString(" FOREIGN KEY(")
 
 	for i, col := range c.Columns {
 		if i != 0 {
@@ -47,7 +53,10 @@ func (c *Constraint) getFkDDL() string {
 		}
 		ddl.WriteString(col.Name)
 	}
-	ddl.WriteString(") REFERENCES " + c.RefTable.Name + "(")
+
+	ddl.WriteString(") REFERENCES ")
+	ddl.WriteString(util.CamelToSnake(c.RefTypeName))
+	ddl.WriteString("(")
 
 	for i, col := range c.RefColumns {
 		if i != 0 {

schema/parser.go

@@ -0,0 +1,103 @@
+package schema
+
+import (
+	"reflect"
+	"strings"
+
+	"git.gdulai.com/gdulai/simpleorm/util"
+	log "gitlab.com/gdulai/simpleloglvl"
+)
+
+type Parser struct {
+	typ         reflect.Type
+	columns     []Column
+	constraints []Constraint
+}
+
+func NewParser[T any](obj T) *Parser {
+	objType := reflect.TypeOf(obj)
+	return &Parser{typ: objType}
+}
+
+// Step 1 of the parsing, it creates the table instance and
+func (p *Parser) ParseColumns() {
+	var columns []Column
+	for field := range p.typ.Fields() {
+		field := field
+		col := NewColumn(util.CamelToSnake((field.Name)), field.Name, determineType(field.Type), field.Tag)
+		columns = append(columns, col)
+	}
+	p.columns = columns
+}
+
+// Step 2 of the parsing, it creates the constrains with the table references
+func (p *Parser) ParseConstraints(tableParsers map[string]*Parser) {
+	pkConstraint := Constraint{Name: "pk_" + strings.ToLower(util.CamelToSnake((p.typ.Name()))), Type: "pk"}
+	fkConstraints := make(map[string]Constraint)
+	for _, col := range p.columns {
+		_, ok := col.Modifiers["pk"]
+		if ok {
+			pkConstraint.Columns = append(pkConstraint.Columns, col)
+			continue
+		}
+
+		fkMod, ok := col.Modifiers["fk"]
+		if !ok {
+			continue
+		}
+
+		fkModParts := strings.Split(fkMod, ".")
+		refTypeName := fkModParts[0]
+		refTableName := util.CamelToSnake(refTypeName)
+		parser, ok := tableParsers[refTypeName]
+		if !ok {
+			log.LogError("[ORM] Reference table not found", refTypeName)
+		}
+
+		fkId, ok := col.Modifiers["fk_id"]
+		if fkId == "" {
+			fkId = "fk_" + strings.ToLower(refTableName)
+		}
+
+		fkConstraint, ok := fkConstraints[fkId]
+		if !ok {
+			fkConstraint = Constraint{Name: fkId, Type: "fk", RefTypeName: refTypeName}
+		}
+
+		fkConstraint.Columns = append(fkConstraint.Columns, col)
+
+		refField := fkModParts[1]
+		for _, refC := range parser.columns {
+			if refC.FieldName == refField {
+				fkConstraint.RefColumns = append(fkConstraint.RefColumns, refC)
+			}
+		}
+
+		fkConstraints[fkId] = fkConstraint
+	}
+
+	p.constraints = append(p.constraints, pkConstraint)
+	for _, fkConstraint := range fkConstraints {
+		p.constraints = append(p.constraints, fkConstraint)
+	}
+}
+
+// Step 3 of the paring, create the schema.Table instance
+// Returns the schema.Table pointer
+func (p Parser) ParseTable() *Table {
+	return &Table{name: util.CamelToSnake(p.typ.Name()), typ: p.typ, columns: p.columns, constraints: p.constraints}
+}
+
+func determineType(typ reflect.Type) string {
+	typStr := typ.String()
+	switch typStr {
+	case "string":
+		return "TEXT"
+	case "int", "bool":
+		return "INTEGER"
+	case "time.Time", "int64":
+		return "BIGINT"
+	}
+
+	return "VARCHAR(255)"
+}

schema/table.go

@@ -1,23 +1,47 @@
 package schema
 
 import (
+	"errors"
 	"reflect"
 	"strings"
 
 	"git.gdulai.com/gdulai/simpleorm/util"
 )
 
+type OrderBy struct {
+	Field     string
+	Direction string
+}
+
 type Table struct {
-	Name        string
+	name        string
-	Type        reflect.Type
+	typ         reflect.Type
-	Columns     []Column
+	columns     []Column
-	Constraints []Constraint
+	constraints []Constraint
+}
+
+func (t Table) Name() string {
+	return t.name
+}
+
+func (t Table) Type() reflect.Type {
+	return t.typ
+}
+
+func (t Table) Columns() []Column {
+	return t.columns
+}
+
+func (t Table) Constraints() []Constraint {
+	return t.constraints
 }
 
 func (t Table) GetDDL() (string, error) {
 	var ddl strings.Builder
-	ddl.WriteString("CREATE TABLE IF NOT EXISTS " + t.Name + " (")
+	ddl.WriteString("CREATE TABLE IF NOT EXISTS ")
-	for i, col := range t.Columns {
+	ddl.WriteString(t.name)
+	ddl.WriteString(" (")
+	for i, col := range t.columns {
 		if i != 0 {
 			ddl.WriteString(", ")
 		}
@@ -27,12 +51,13 @@ func (t Table) GetDDL() (string, error) {
 		}
 		ddl.WriteString(colDdl)
 	}
-	for _, constr := range t.Constraints {
+	for _, constr := range t.constraints {
 		constrDdl, err := constr.GetDDL()
 		if err != nil {
 			return "", err
 		}
-		ddl.WriteString(", " + constrDdl)
+		ddl.WriteString(", ")
+		ddl.WriteString(constrDdl)
 	}
 
 	ddl.WriteString(");")
@@ -43,7 +68,7 @@ func (t Table) GetSelectDML() (string, error) {
 	var dml strings.Builder
 	dml.WriteString("SELECT ")
 
-	for i, col := range t.Columns {
+	for i, col := range t.columns {
 		if i != 0 {
 			dml.WriteString(", ")
 		}
@@ -54,21 +79,24 @@ func (t Table) GetSelectDML() (string, error) {
 		dml.WriteString(colDml)
 	}
 
-	dml.WriteString(" FROM " + t.Name)
+	dml.WriteString(" FROM ")
+	dml.WriteString(t.name)
 	return dml.String(), nil
 }
 
 func (t Table) GetCountDML() string {
-	return "SELECT COUNT(*) FROM " + t.Name
+	return "SELECT COUNT(*) FROM " + t.name
 }
 
 func (t Table) GetInsertDML(count int) (string, error) {
 	var dml strings.Builder
-	dml.WriteString("INSERT INTO " + util.CamelToSnake(t.Type.Name()) + " (")
+	dml.WriteString("INSERT INTO ")
+	dml.WriteString(util.CamelToSnake(t.typ.Name()))
+	dml.WriteString(" (")
 
-	columnsLen := len(t.Columns)
+	columnsLen := len(t.columns)
 	effectiveColumnsLen := 0
-	for i, col := range t.Columns {
+	for i, col := range t.columns {
 		_, ok := col.Modifiers["pk"]
 		if ok && t.IsPkAuto() {
 			continue
@@ -111,12 +139,14 @@ func (t Table) GetInsertDML(count int) (string, error) {
 
 func (t Table) GetUpdateDML() (string, error) {
 	var dml strings.Builder
-	dml.WriteString("UPDATE  " + util.CamelToSnake(t.Type.Name()) + " SET ")
+	dml.WriteString("UPDATE  ")
+	dml.WriteString(util.CamelToSnake(t.typ.Name()))
+	dml.WriteString(" SET ")
 
-	colLen := len(t.Columns)
+	colLen := len(t.columns)
 	var pkColumns []string
 	// Colum names
-	for i, col := range t.Columns {
+	for i, col := range t.columns {
 		modifiers := col.Modifiers
 
 		_, ok := modifiers["pk"]
@@ -133,9 +163,11 @@ func (t Table) GetUpdateDML() (string, error) {
 		}
 
 		if i != colLen-1 {
-			dml.WriteString(colDml + ", ")
+			dml.WriteString(colDml)
+			dml.WriteString(", ")
 		} else {
-			dml.WriteString(colDml + " ")
+			dml.WriteString(colDml)
+			dml.WriteString(" ")
 		}
 	}
 
@@ -145,7 +177,8 @@ func (t Table) GetUpdateDML() (string, error) {
 		if i != 0 {
 			dml.WriteString(" AND ")
 		}
-		dml.WriteString(pkCol + " = ?")
+		dml.WriteString(pkCol)
+		dml.WriteString(" = ?")
 	}
 
 	return dml.String(), nil
@@ -153,17 +186,21 @@ func (t Table) GetUpdateDML() (string, error) {
 
 func (t Table) GetDeleteDML(count int) (string, error) {
 	var dml strings.Builder
-	dml.WriteString("DELETE FROM " + t.Name + " WHERE ")
+	dml.WriteString("DELETE FROM ")
+	dml.WriteString(t.name)
+	dml.WriteString(" WHERE ")
 
-	for _, col := range t.Columns {
+	for _, col := range t.columns {
 		modifiers := col.Modifiers
 
 		_, ok := modifiers["pk"]
 		if ok {
 			if count > 1 {
-				dml.WriteString(col.Name + " IN (")
+				dml.WriteString(col.Name)
+				dml.WriteString(" IN (")
 			} else {
-				dml.WriteString(col.Name + " = ")
+				dml.WriteString(col.Name)
+				dml.WriteString(" = ")
 			}
 		}
 	}
@@ -182,8 +219,33 @@ 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 {
+	for _, constr := range t.constraints {
 		if constr.Type != "pk" {
 			continue
 		}

test/exec_test.go

@@ -9,36 +9,6 @@ import (
 	log "gitlab.com/gdulai/simpleloglvl"
 )
 
-func TestSelectEmpty(t *testing.T) {
-	// GIVEN
-	orm, conn := testSetup()
-	defer cleanUp("test.db", conn)
-
-	// WHEN
-	selectExec, err := exec.CreateSelect[Test](orm, "")
-
-	// THEN
-	if err != nil {
-		log.LogError("Failed to create select. %s", err)
-		t.Fail()
-		return
-	}
-
-	err = selectExec.Execute(conn)
-	if err != nil {
-		log.LogError("Select failure. %s", err)
-		t.Fail()
-		return
-	}
-
-	res := selectExec.Results()
-	if len(res) > 0 {
-		log.LogError("Expected empty result.")
-		t.Fail()
-		return
-	}
-}
-
 func TestInsert(t *testing.T) {
 	// GIVEN
 	orm, conn := testSetup()
@@ -133,193 +103,6 @@ func TestInsertMultiple(t *testing.T) {
 
 }
 
-func TestInsertAndSelectSingle(t *testing.T) {
-	// GIVEN
-	orm, conn := testSetup()
-	defer cleanUp("test.db", conn)
-
-	testObj := Test{Int64Field: 54, IntField: 12, StringField: "asdf"}
-
-	// WHEN
-	insertExec, err := exec.NewInsert(orm, testObj)
-	if err != nil {
-		log.LogError("TestInsertAndSelectSingle setup failed: %s", err)
-		t.Fail()
-		return
-	}
-
-	selectExec, err := exec.CreateSelect[Test](orm, "")
-	if err != nil {
-		log.LogError("TestInsertAndSelectSingle setup failed: %s", err)
-		t.Fail()
-		return
-	}
-
-	insertErr := insertExec.Execute(conn)
-	selectErr := selectExec.Execute(conn)
-
-	// THEN
-	if insertErr != nil {
-		log.LogError("TestInsertAndSelectSingle insert failed: %s", err)
-		t.Fail()
-		return
-	}
-
-	if selectErr != nil {
-		log.LogError("TestInsertAndSelectSingle failure. %s", err)
-		t.Fail()
-		return
-	}
-
-	insertRes := insertExec.Results()
-	if len(insertRes) != 1 {
-		log.LogError("TestInsertAndSelectSingle test failed. Expected: 1, Actual: %s", len(insertRes))
-		t.Fail()
-		return
-	}
-
-	selectRes := selectExec.Results()
-	if len(selectRes) != 1 {
-		log.LogError("TestInsertAndSelectSingle test failed. Expected: 1, Actual: %s", len(selectRes))
-		t.Fail()
-		return
-	}
-
-	singleRes := insertRes[0]
-	if singleRes.ID != 1 || singleRes.Int64Field != 54 || singleRes.IntField != 12 || singleRes.StringField != "asdf" {
-		log.LogError("TestInsertAndSelectSingle invalid result. Expected: %s, Actual: %s", testObj, singleRes)
-		t.Fail()
-	}
-
-	singleRes = selectRes[0]
-	if singleRes.ID != 1 || singleRes.Int64Field != 54 || singleRes.IntField != 12 || singleRes.StringField != "asdf" {
-		log.LogError("TestInsertAndSelectSingle invalid result. Expected: %s, Actual: %s", testObj, singleRes)
-		t.Fail()
-	}
-
-}
-
-func TestInsertSelectWithCompositePk(t *testing.T) {
-	// GIVEN
-	orm, conn := testSetup()
-	defer cleanUp("test.db", conn)
-
-	testObj := TestWithCompositePk{ID: 12, Name: "Test"}
-
-	// WHEN
-	insertExec, err := exec.NewInsert(orm, testObj)
-	if err != nil {
-		log.LogError("TestInsertSelectWithCompositePk setup failed: %s", err)
-		t.Fail()
-		return
-	}
-
-	selectExec, err := exec.CreateSelect[TestWithCompositePk](orm, "")
-	if err != nil {
-		log.LogError("TestInsertSelectWithCompositePk setup failed: %s", err)
-		t.Fail()
-		return
-	}
-
-	err = insertExec.Execute(conn)
-	if err != nil {
-		log.LogError("TestInsertSelectWithCompositePk insert failed: %s", err)
-		t.Fail()
-		return
-	}
-
-	err = selectExec.Execute(conn)
-
-	// THEN
-	if err != nil {
-		log.LogError("TestInsertSelectWithCompositePk failure. %s", err)
-		t.Fail()
-		return
-	}
-
-	res := selectExec.Results()
-	if len(res) != 1 {
-		log.LogError("TestInsertSelectWithCompositePk test failed. Expected: 1, Actual: %s", len(res))
-		t.Fail()
-		return
-	}
-
-	singleRes := res[0]
-	if singleRes.ID != 12 || singleRes.Name != "Test" {
-		log.LogError("TestInsertSelectWithCompositePk invalid result. Expected: %s, Actual: %s", testObj, singleRes)
-		t.Fail()
-	}
-
-}
-
-func TestInsertMultipleAndSelectWithParam(t *testing.T) {
-	// GIVEN
-	orm, conn := testSetup()
-	defer cleanUp("test.db", conn)
-
-	// WHEN
-	testObj := Test{Int64Field: 54, IntField: 12, StringField: "asdf"}
-	testObjSecond := Test{Int64Field: 12, IntField: 54, StringField: "fdsa"}
-
-	insertExec, err := exec.NewInsert(orm, testObj)
-	if err != nil {
-		log.LogError("TestInsertMultipleAndSelectWithParam setup failed: %s", err)
-		t.Fail()
-		return
-	}
-
-	insertSecond, err := exec.NewInsert(orm, testObjSecond)
-	if err != nil {
-		log.LogError("TestInsertMultipleAndSelectWithParam setup failed: %s", err)
-		t.Fail()
-		return
-	}
-
-	selectExec, err := exec.CreateSelect[Test](orm, "string_field = ?", "fdsa")
-	if err != nil {
-		log.LogError("TestInsertMultipleAndSelectWithParam setup failed: %s", err)
-		t.Fail()
-		return
-	}
-
-	err = insertExec.Execute(conn)
-	if err != nil {
-		log.LogError("TestInsertMultipleAndSelectWithParam first insert failed: %s", err)
-		t.Fail()
-		return
-	}
-
-	err = insertSecond.Execute(conn)
-	if err != nil {
-		log.LogError("TestInsertMultipleAndSelectWithParam second insert failed: %s", err)
-		t.Fail()
-		return
-	}
-
-	err = selectExec.Execute(conn)
-
-	// THEN
-	if err != nil {
-		log.LogError("TestInsertMultipleAndSelectWithParam failure. %s", err)
-		t.Fail()
-		return
-	}
-
-	res := selectExec.Results()
-	if len(res) != 1 {
-		log.LogError(" TestInsertMultipleAndSelectWithParam test failed. Expected: 1, Actual: %s", len(res))
-		t.Fail()
-		return
-	}
-
-	singleRes := res[0]
-	if singleRes.ID != 2 || singleRes.Int64Field != 12 || singleRes.IntField != 54 || singleRes.StringField != "fdsa" {
-		log.LogError("TestInsertMultipleAndSelectWithParam invalid result. Expected: %s, Actual: %s", testObjSecond, singleRes)
-		t.Fail()
-		return
-	}
-}
-
 func TestInsertAndUpdate(t *testing.T) {
 	// GIVEN
 	orm, conn := testSetup()
@@ -335,13 +118,15 @@ func TestInsertAndUpdate(t *testing.T) {
 		return
 	}
 
-	selectExec, err := exec.CreateSelect[Test](orm, "string_field = ?", "asdf")
+	selectExec, err := exec.CreateSelect[Test](orm)
 	if err != nil {
 		log.LogError("TestInsertMultipleAndSelectWithParam setup failed: %s", err)
 		t.Fail()
 		return
 	}
 
+	selectExec.Where("string_field = ?", "asdf")
+
 	err = insertExec.Execute(conn)
 	if err != nil {
 		log.LogError("TestInsertAndUpdate insert failed: %s", err)
@@ -422,7 +207,7 @@ func TestInsertAndDelete(t *testing.T) {
 		return
 	}
 
-	selectExec, err := exec.CreateSelect[Test](orm, "")
+	selectExec, err := exec.CreateSelect[Test](orm)
 	if err != nil {
 		log.LogError("TestInsertAndDelete setup failed: %s", err)
 		t.Fail()
@@ -478,7 +263,7 @@ func TestBoolInsertAndSelectSingle(t *testing.T) {
 		return
 	}
 
-	selectExec, err := exec.CreateSelect[TestWithBool](orm, "")
+	selectExec, err := exec.CreateSelect[TestWithBool](orm)
 	if err != nil {
 		log.LogError("TestBoolInsertAndSelectSingle setup failed: %s", err)
 		t.Fail()
@@ -532,7 +317,7 @@ func TestTimeInsertAndSelectSingle(t *testing.T) {
 		return
 	}
 
-	selectExec, err := exec.CreateSelect[TestWithTime](orm, "")
+	selectExec, err := exec.CreateSelect[TestWithTime](orm)
 	if err != nil {
 		log.LogError("TestTimeInsertAndSelectSingle setup failed: %s", err)
 		t.Fail()
@@ -638,13 +423,15 @@ func TestTransactionRollback(t *testing.T) {
 		return
 	}
 
-	selectExec, err := exec.CreateSelect[Test](orm, "id = ?", insertExec.Results()[0].ID)
+	selectExec, err := exec.CreateSelect[Test](orm)
 	if err != nil {
 		log.LogError("TestTransactionRollback WHEN failed: %s", err)
 		t.Fail()
 		return
 	}
 
+	selectExec.Where("id = ?", insertExec.Results()[0].ID)
+
 	transErr = transaction.Execute(&selectExec)
 	if transErr != nil {
 		log.LogError("TestTransactionRollback WHEN failed: %s", err)
@@ -683,56 +470,6 @@ func TestTransactionRollback(t *testing.T) {
 	}
 }
 
-func TestSelectWithLimitAndOffset(t *testing.T) {
-	// GIVEN
-	orm, conn := testSetup()
-	defer cleanUp("test.db", conn)
-
-	testEntites := []Test{}
-
-	for i := 0; i < 1000; i++ {
-		testEntites = append(testEntites, Test{Int64Field: -1, IntField: i, StringField: "Entity " + strconv.Itoa(i)})
-	}
-
-	insertExec, err := exec.NewInsert[Test](orm, testEntites...)
-	if err != nil {
-		log.LogError("TestSelectWithLimitAndOffset setup failed: %s", err)
-		t.Fail()
-		return
-	}
-
-	err = insertExec.Execute(conn)
-	if err != nil {
-		log.LogError("TestSelectWithLimitAndOffset setup failed: %s", err)
-		t.Fail()
-		return
-	}
-	// WHEN
-
-	selectExec, err := exec.CreateSelect[Test](orm, "")
-	if err != nil {
-		log.LogError("TestSelectWithLimitAndOffset failed: %s", err)
-		t.Fail()
-		return
-	}
-	selectExec.Limit = 100
-	selectExec.Offset = 0
-
-	err = selectExec.Execute(conn)
-	if err != nil {
-		log.LogError("TestSelectWithLimitAndOffset failed: %s", err)
-		t.Fail()
-		return
-	}
-
-	// THEN
-
-	if len(selectExec.Results()) != 100 {
-		log.LogError("TestSelectWithLimitAndOffset expected result size 100, actual: %s", len(selectExec.Results()))
-		t.Fail()
-	}
-}
-
 func TestCount(t *testing.T) {
 	// GIVEN
 	orm, conn := testSetup()

test/select_test.go

@@ -0,0 +1,379 @@
+package simpleorm_test
+
+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"
+)
+
+func TestSelectEmpty(t *testing.T) {
+	// GIVEN
+	orm, conn := testSetup()
+	defer cleanUp("test.db", conn)
+
+	// WHEN
+	selectExec, err := exec.CreateSelect[Test](orm)
+
+	// THEN
+	if err != nil {
+		log.LogError("Failed to create select. %s", err)
+		t.Fail()
+		return
+	}
+
+	err = selectExec.Execute(conn)
+	if err != nil {
+		log.LogError("Select failure. %s", err)
+		t.Fail()
+		return
+	}
+
+	res := selectExec.Results()
+	if len(res) > 0 {
+		log.LogError("Expected empty result.")
+		t.Fail()
+		return
+	}
+}
+
+func TestSelectSingle(t *testing.T) {
+	// GIVEN
+	orm, conn := testSetup()
+	defer cleanUp("test.db", conn)
+
+	testObj := Test{Int64Field: 54, IntField: 12, StringField: "asdf"}
+
+	// WHEN
+	insertExec, err := exec.NewInsert(orm, testObj)
+	if err != nil {
+		log.LogError("TestInsertAndSelectSingle setup failed: %s", err)
+		t.Fail()
+		return
+	}
+
+	selectExec, err := exec.CreateSelect[Test](orm)
+	if err != nil {
+		log.LogError("TestInsertAndSelectSingle setup failed: %s", err)
+		t.Fail()
+		return
+	}
+
+	insertErr := insertExec.Execute(conn)
+	selectErr := selectExec.Execute(conn)
+
+	// THEN
+	if insertErr != nil {
+		log.LogError("TestInsertAndSelectSingle insert failed: %s", err)
+		t.Fail()
+		return
+	}
+
+	if selectErr != nil {
+		log.LogError("TestInsertAndSelectSingle failure. %s", err)
+		t.Fail()
+		return
+	}
+
+	insertRes := insertExec.Results()
+	if len(insertRes) != 1 {
+		log.LogError("TestInsertAndSelectSingle test failed. Expected: 1, Actual: %s", len(insertRes))
+		t.Fail()
+		return
+	}
+
+	selectRes := selectExec.Results()
+	if len(selectRes) != 1 {
+		log.LogError("TestInsertAndSelectSingle test failed. Expected: 1, Actual: %s", len(selectRes))
+		t.Fail()
+		return
+	}
+
+	singleRes := insertRes[0]
+	if singleRes.ID != 1 || singleRes.Int64Field != 54 || singleRes.IntField != 12 || singleRes.StringField != "asdf" {
+		log.LogError("TestInsertAndSelectSingle invalid result. Expected: %s, Actual: %s", testObj, singleRes)
+		t.Fail()
+	}
+
+	singleRes = selectRes[0]
+	if singleRes.ID != 1 || singleRes.Int64Field != 54 || singleRes.IntField != 12 || singleRes.StringField != "asdf" {
+		log.LogError("TestInsertAndSelectSingle invalid result. Expected: %s, Actual: %s", testObj, singleRes)
+		t.Fail()
+	}
+
+}
+
+func TestSelectWithCompositePk(t *testing.T) {
+	// GIVEN
+	orm, conn := testSetup()
+	defer cleanUp("test.db", conn)
+
+	testObj := TestWithCompositePk{ID: 12, Name: "Test"}
+
+	// WHEN
+	insertExec, err := exec.NewInsert(orm, testObj)
+	if err != nil {
+		log.LogError("TestInsertSelectWithCompositePk setup failed: %s", err)
+		t.Fail()
+		return
+	}
+
+	selectExec, err := exec.CreateSelect[TestWithCompositePk](orm)
+	if err != nil {
+		log.LogError("TestInsertSelectWithCompositePk setup failed: %s", err)
+		t.Fail()
+		return
+	}
+
+	err = insertExec.Execute(conn)
+	if err != nil {
+		log.LogError("TestInsertSelectWithCompositePk insert failed: %s", err)
+		t.Fail()
+		return
+	}
+
+	err = selectExec.Execute(conn)
+
+	// THEN
+	if err != nil {
+		log.LogError("TestInsertSelectWithCompositePk failure. %s", err)
+		t.Fail()
+		return
+	}
+
+	res := selectExec.Results()
+	if len(res) != 1 {
+		log.LogError("TestInsertSelectWithCompositePk test failed. Expected: 1, Actual: %s", len(res))
+		t.Fail()
+		return
+	}
+
+	singleRes := res[0]
+	if singleRes.ID != 12 || singleRes.Name != "Test" {
+		log.LogError("TestInsertSelectWithCompositePk invalid result. Expected: %s, Actual: %s", testObj, singleRes)
+		t.Fail()
+	}
+
+}
+
+func TestSelectWithParam(t *testing.T) {
+	// GIVEN
+	orm, conn := testSetup()
+	defer cleanUp("test.db", conn)
+
+	// WHEN
+	testObj := Test{Int64Field: 54, IntField: 12, StringField: "asdf"}
+	testObjSecond := Test{Int64Field: 12, IntField: 54, StringField: "fdsa"}
+
+	insertExec, err := exec.NewInsert(orm, testObj)
+	if err != nil {
+		log.LogError("TestInsertMultipleAndSelectWithParam setup failed: %s", err)
+		t.Fail()
+		return
+	}
+
+	insertSecond, err := exec.NewInsert(orm, testObjSecond)
+	if err != nil {
+		log.LogError("TestInsertMultipleAndSelectWithParam setup failed: %s", err)
+		t.Fail()
+		return
+	}
+
+	selectExec, err := exec.CreateSelect[Test](orm)
+	if err != nil {
+		log.LogError("TestInsertMultipleAndSelectWithParam setup failed: %s", err)
+		t.Fail()
+		return
+	}
+
+	selectExec.Where("string_field = ?", "fdsa")
+
+	err = insertExec.Execute(conn)
+	if err != nil {
+		log.LogError("TestInsertMultipleAndSelectWithParam first insert failed: %s", err)
+		t.Fail()
+		return
+	}
+
+	err = insertSecond.Execute(conn)
+	if err != nil {
+		log.LogError("TestInsertMultipleAndSelectWithParam second insert failed: %s", err)
+		t.Fail()
+		return
+	}
+
+	err = selectExec.Execute(conn)
+
+	// THEN
+	if err != nil {
+		log.LogError("TestInsertMultipleAndSelectWithParam failure. %s", err)
+		t.Fail()
+		return
+	}
+
+	res := selectExec.Results()
+	if len(res) != 1 {
+		log.LogError(" TestInsertMultipleAndSelectWithParam test failed. Expected: 1, Actual: %s", len(res))
+		t.Fail()
+		return
+	}
+
+	singleRes := res[0]
+	if singleRes.ID != 2 || singleRes.Int64Field != 12 || singleRes.IntField != 54 || singleRes.StringField != "fdsa" {
+		log.LogError("TestInsertMultipleAndSelectWithParam invalid result. Expected: %s, Actual: %s", testObjSecond, singleRes)
+		t.Fail()
+		return
+	}
+}
+
+func TestSelectWithLimitAndOffset(t *testing.T) {
+	// GIVEN
+	orm, conn := testSetup()
+	defer cleanUp("test.db", conn)
+
+	testEntites := []Test{}
+
+	for i := 0; i < 1000; i++ {
+		testEntites = append(testEntites, Test{Int64Field: -1, IntField: i, StringField: "Entity " + strconv.Itoa(i)})
+	}
+
+	insertExec, err := exec.NewInsert[Test](orm, testEntites...)
+	if err != nil {
+		log.LogError("TestSelectWithLimitAndOffset setup failed: %s", err)
+		t.Fail()
+		return
+	}
+
+	err = insertExec.Execute(conn)
+	if err != nil {
+		log.LogError("TestSelectWithLimitAndOffset setup failed: %s", err)
+		t.Fail()
+		return
+	}
+	// WHEN
+
+	selectExec, err := exec.CreateSelect[Test](orm)
+	if err != nil {
+		log.LogError("TestSelectWithLimitAndOffset failed: %s", err)
+		t.Fail()
+		return
+	}
+	selectExec.Limit(100).Offset(0)
+
+	err = selectExec.Execute(conn)
+	if err != nil {
+		log.LogError("TestSelectWithLimitAndOffset failed: %s", err)
+		t.Fail()
+		return
+	}
+
+	// THEN
+
+	if len(selectExec.Results()) != 100 {
+		log.LogError("TestSelectWithLimitAndOffset expected result size 100, actual: %s", len(selectExec.Results()))
+		t.Fail()
+	}
+}
+
+func TestSelectOrderByDesc(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("TestSelectOrderByDesc failed: %s", err)
+		t.Fail()
+		return
+	}
+	selectExec.OrderBy(schema.OrderBy{Field: "StringField", Direction: "DESC"})
+
+	err = selectExec.Execute(conn)
+	if err != nil {
+		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
+	}
+
+	// THEN
+	var resultStr string
+	for _, obj := range selectExec.Results() {
+		resultStr += obj.StringField
+	}
+
+	if resultStr != "ABCDE" {
+		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
+}