Update check_table_integrity.go, check_table_integrity_test.go, create_table.go, create_table_test.go, insert.go, insert_test.go, object_structure.go, store.go, table_structure.go, types.go

check_table_integrity.go

@@ -0,0 +1,15 @@
+package advsql
+
+func (s *Store) checkTableIntegrity(value interface{}) (bool, error) {
+	valueStructure, err := objectStructure(value)
+	if err != nil {
+		return false, err
+	}
+
+	tableStructure, err := s.tableStructure(valueStructure.TypeName)
+	if err != nil {
+		return false, err
+	}
+
+	return compareStructures(valueStructure, tableStructure), nil
+}

check_table_integrity_test.go

@@ -0,0 +1,34 @@
+package advsql
+
+import (
+	"log"
+	"testing"
+
+	_ "github.com/go-sql-driver/mysql"
+)
+
+func TestCheckTableIntegrity(t *testing.T) {
+	store, err := NewStoreMySQL("localhost", 3306, "kaikei", "u399D-TFulJykgRF4ijW6G7tK6zdO-jy", "kaikei")
+	if err != nil {
+		t.Fatal("could not make store", err)
+	}
+
+	type Person struct {
+		Surname  string
+		Lastname string
+		Age      int
+	}
+
+	p := &Person{
+		Surname:  "Timon",
+		Lastname: "Ringwald",
+		Age:      25,
+	}
+
+	integrity, err := store.checkTableIntegrity(p)
+	if err != nil {
+		t.Fatal("could not check table integrity", err)
+	}
+
+	log.Println("integrity:", integrity)
+}

create_table.go

@@ -0,0 +1,96 @@
+package advsql
+
+import (
+	"log"
+	"reflect"
+	"strings"
+)
+
+func (s *Store) createTable(structure *structure) error {
+	b := new(strings.Builder)
+	b.WriteString("CREATE TABLE ")
+	b.WriteString(structure.TypeName)
+	b.WriteString("(")
+
+	fieldAmount := len(structure.Fields)
+
+	for i, field := range structure.Fields {
+		b.WriteString(field.FieldName)
+		b.WriteString(" ")
+		b.WriteString(getTypeSpecForDB(field.FieldType))
+
+		if i < fieldAmount-1 {
+			b.WriteString(",")
+		}
+	}
+
+	b.WriteString(")")
+
+	log.Println("sql command: " + b.String())
+
+	_, err := s.db.Exec(b.String())
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func getTypeSpecForDB(t reflect.Type) string {
+	noPtrType := t
+	dereferenced := false
+
+	// derefence all pointers recursively
+	for noPtrType.Kind() == reflect.Ptr {
+		noPtrType = t.Elem()
+		dereferenced = true
+	}
+
+	// actual data types
+	b := new(strings.Builder)
+	switch noPtrType.Kind() {
+	case reflect.Bool:
+		b.WriteString("INT")
+
+	case reflect.Int:
+		b.WriteString("BIGINT")
+	case reflect.Int8:
+		b.WriteString("TINYINT")
+	case reflect.Int16:
+		b.WriteString("SMALLINT")
+	case reflect.Int32:
+		b.WriteString("INT")
+	case reflect.Int64:
+		b.WriteString("BIGINT")
+
+	case reflect.Uint:
+		b.WriteString("BIGINT UNSIGNED")
+	case reflect.Uint8:
+		b.WriteString("TINYINT UNSIGNED")
+	case reflect.Uint16:
+		b.WriteString("SMALLINT UNSIGNED")
+	case reflect.Uint32:
+		b.WriteString("INT UNSIGNED")
+	case reflect.Uint64:
+		b.WriteString("BIGINT UNSIGNED")
+
+	case reflect.Float32:
+		b.WriteString("FLOAT")
+	case reflect.Float64:
+		b.WriteString("DOUBLE")
+
+	case reflect.String:
+		b.WriteString("TEXT")
+
+	case reflect.Ptr:
+		panic("something's broken. All pointers should have been dereferenced by now")
+	default:
+		panic("type spec for db not implemented yet: " + noPtrType.Kind().String())
+	}
+
+	if !dereferenced {
+		b.WriteString(" NOT NULL")
+	}
+
+	return b.String()
+}

create_table_test.go

@@ -0,0 +1,34 @@
+package advsql
+
+import (
+	"testing"
+)
+
+func TestCreateTable(t *testing.T) {
+	store, err := NewStoreMySQL("localhost", 3306, "kaikei", "u399D-TFulJykgRF4ijW6G7tK6zdO-jy", "kaikei")
+	if err != nil {
+		t.Fatal("could not make store", err)
+	}
+
+	type Person struct {
+		Surname  string
+		Lastname string
+		Age      int
+	}
+
+	p := &Person{
+		Surname:  "Timon",
+		Lastname: "Ringwald",
+		Age:      25,
+	}
+
+	structure, err := objectStructure(p)
+	if err != nil {
+		t.Fatal("Could not get structure of value", err)
+	}
+
+	err = store.createTable(structure)
+	if err != nil {
+		t.Fatal("Could not create table", err)
+	}
+}

insert.go

@@ -0,0 +1,10 @@
+package advsql
+
+func (s *Store) Insert(value interface{}) error {
+	structure, err := objectStructure(value)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}

insert_test.go

@@ -0,0 +1,27 @@
+package advsql
+
+import "testing"
+
+func TestInsert(t *testing.T) {
+	store, err := NewStoreMySQL("localhost", 3306, "kaikei", "u399D-TFulJykgRF4ijW6G7tK6zdO-jy", "kaikei")
+	if err != nil {
+		t.Fatal("could not make store", err)
+	}
+
+	type Person struct {
+		Surname  string
+		Lastname string
+		Age      int
+	}
+
+	p := &Person{
+		Surname:  "Timon",
+		Lastname: "Ringwald",
+		Age:      25,
+	}
+
+	err = store.Insert(p)
+	if err != nil {
+		t.Fatal("Could not create table", err)
+	}
+}

object_structure.go

@@ -0,0 +1,35 @@
+package advsql
+
+import (
+	"reflect"
+	"errors"
+)
+
+var ErrNoStructure = errors.New("value is not of type structure")
+
+// analyze returns the structure of value
+func objectStructure(value interface{}) (*structure, error) {
+	t := reflect.TypeOf(value)
+	k := t.Kind()
+
+	// only structs are allowed to be stored in DB
+	// if pointer: dereference and check again via recursion
+	if k == reflect.Ptr {
+		v := reflect.ValueOf(value)
+		return objectStructure(reflect.Indirect(v).Interface())
+	} else if k != reflect.Struct {
+		return nil, ErrNoStructure
+	}
+
+	fieldAmount := t.NumField()
+	structure := new(structure)
+	structure.TypeName = t.Name()
+	structure.Fields = make([]field, fieldAmount)
+
+	for fieldIndex := 0; fieldIndex < fieldAmount; fieldIndex++ {
+		reflectField := t.Field(fieldIndex)
+		structure.Fields[fieldIndex] = makeFieldUsingReflect(reflectField)
+	}
+
+	return structure, nil
+}

store.go

@@ -0,0 +1,47 @@
+package advsql
+
+import (
+	"database/sql"
+	"fmt"
+)
+
+type Store struct {
+	db *sql.DB
+}
+
+func NewStoreMySQL(host string, port uint16, user, pass, db string) (*Store, error) {
+	dsn := fmt.Sprintf("%s:%s@tcp(%s:%d)/%s", user, pass, host, port, db)
+
+	conn, err := sql.Open("mysql", dsn)
+	if err != nil {
+		return nil, err
+	}
+
+	return NewStore(conn), nil
+}
+
+func NewStore(db *sql.DB) *Store {
+	return &Store{
+		db: db,
+	}
+}
+
+func (s *Store) Close() error {
+	stmts := []*sql.Stmt{}
+
+	var err error
+
+	for _, stmt := range stmts {
+		err = stmt.Close()
+		if err != nil {
+			return err
+		}
+	}
+
+	err = s.db.Close()
+	if err != nil {
+		return err
+	}
+
+	return nil
+}

table_structure.go

@@ -0,0 +1,29 @@
+package advsql
+
+func (s *Store) tableStructure(tableName string) (*structure, error) {
+	rows, err := s.db.Query("SELECT * FROM " + tableName)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	types, err := rows.ColumnTypes()
+	if err != nil {
+		return nil, err
+	}
+
+	structure := new(structure)
+	structure.TypeName = tableName
+
+	columnAmount := len(types)
+	structure.Fields = make([]field, columnAmount)
+
+	for columnIndex, columType := range types {
+		structure.Fields[columnIndex] = field{
+			FieldName: columType.Name(),
+			FieldType: columType.ScanType(),
+		}
+	}
+
+	return structure, nil
+}

types.go

@@ -0,0 +1,94 @@
+package advsql
+
+import (
+	"log"
+	"reflect"
+)
+
+type structure struct {
+	TypeName string
+	Fields   []field
+}
+
+type field struct {
+	FieldName string
+	FieldType reflect.Type
+}
+
+func makeFieldUsingReflect(reflectField reflect.StructField) field {
+	return field{
+		FieldName: reflectField.Name,
+		FieldType: reflectField.Type,
+	}
+}
+
+func compareStructures(first, second *structure) bool {
+	// compare names
+	if first.TypeName != second.TypeName {
+		log.Println("different names")
+		return false
+	}
+
+	firstFieldAmount, secondFieldAmount := len(first.Fields), len(second.Fields)
+
+	// compare field amounts
+	if firstFieldAmount != secondFieldAmount {
+		log.Println("different field amounts")
+		return false
+	}
+
+	// compare fields
+	for i := 0; i < firstFieldAmount; i++ {
+		firstField, secondField := first.Fields[i], second.Fields[i]
+		if !compareFields(firstField, secondField) {
+			log.Println("different field:", firstField, secondField)
+			return false
+		}
+	}
+
+	return true
+}
+
+func compareFields(first, second field) bool {
+	t1, t2 := first.FieldType, second.FieldType
+
+	// check if field names are equal
+	fieldNamesEqual := first.FieldName == second.FieldName
+
+	// exceptions for default comparison
+	switch true {
+	case checkBoth(first, second, isString, isByteSlice):
+		fallthrough
+	case isInt(first) && isInt(second):
+		fallthrough
+	case isUint(first) && isUint(second):
+		return fieldNamesEqual
+
+	default:
+		return t1 == t2
+	}
+}
+
+// TypeCheckFunc represents any function for type checking between Go and DB
+type TypeCheckFunc func(field) bool
+
+// checks if both check functions apply to either of the fields
+func checkBoth(first, second field, firstCheck, secondCheck TypeCheckFunc) bool {
+	return firstCheck(first) && secondCheck(second) || firstCheck(second) && secondCheck(first)
+}
+
+func isString(field field) bool {
+	return field.FieldType.Kind() == reflect.String
+}
+
+func isInt(field field) bool {
+	return field.FieldType.Kind() == reflect.Int || field.FieldType.Kind() == reflect.Int64
+}
+
+func isUint(field field) bool {
+	return field.FieldType.Kind() == reflect.Uint || field.FieldType.Kind() == reflect.Uint64
+}
+
+func isByteSlice(field field) bool {
+	return field.FieldType.Kind() == reflect.Slice && field.FieldType.Elem().Kind() == reflect.Uint8
+}