Adding unit test for VTable Insert/Update/Delete

Author: kenshaw

sqlite3_vtable.go

@@ -537,7 +537,14 @@ func goVUpdate(pVTab unsafe.Pointer, argc C.int, argv **C.sqlite3_value, pRowid
 			if err != nil {
 				return mPrintf("%s", err.Error())
 			}
-			vals = append(vals, conv.Interface())
+
+			// work around for SQLITE_NULL
+			x := conv.Interface()
+			if z, ok := x.([]byte); ok && z == nil {
+				x = nil
+			}
+
+			vals = append(vals, x)
 		}
 
 		switch {

sqlite3_vtable_test.go

@@ -8,8 +8,11 @@ package sqlite3
 
 import (
 	"database/sql"
+	"errors"
 	"fmt"
 	"os"
+	"reflect"
+	"strings"
 	"testing"
 )
 
@@ -148,8 +151,335 @@ func TestCreateModule(t *testing.T) {
 			t.Fatalf("want %v but %v", intarray[i], value)
 		}
 	}
+
 	_, err = db.Exec("DROP TABLE vtab")
 	if err != nil {
 		t.Fatalf("couldn't drop virtual table: %v", err)
 	}
 }
+
+func TestVUpdate(t *testing.T) {
+	tempFilename := TempFilename(t)
+	defer os.Remove(tempFilename)
+
+	// create module
+	updateMod := &vtabUpdateModule{t, make(map[string]*vtabUpdateTable)}
+
+	// register module
+	sql.Register("sqlite3_TestVUpdate", &SQLiteDriver{
+		ConnectHook: func(conn *SQLiteConn) error {
+			return conn.CreateModule("updatetest", updateMod)
+		},
+	})
+
+	// connect
+	db, err := sql.Open("sqlite3_TestVUpdate", tempFilename)
+	if err != nil {
+		t.Fatalf("could not open db: %v", err)
+	}
+
+	// create test table
+	_, err = db.Exec(`CREATE VIRTUAL TABLE vt USING updatetest(f1 integer, f2 text, f3 text)`)
+	if err != nil {
+		t.Fatalf("could not create updatetest vtable vt, got: %v", err)
+	}
+
+	// check that table is defined properly
+	if len(updateMod.tables) != 1 {
+		t.Fatalf("expected exactly 1 table to exist, got: %d", len(updateMod.tables))
+	}
+	if _, ok := updateMod.tables["vt"]; !ok {
+		t.Fatalf("expected table `vt` to exist in tables")
+	}
+
+	// check nothing in updatetest
+	rows, err := db.Query(`select * from vt`)
+	if err != nil {
+		t.Fatalf("could not query vt, got: %v", err)
+	}
+	i, err := getRowCount(rows)
+	if err != nil {
+		t.Fatalf("expected no error, got: %v", err)
+	}
+	if i != 0 {
+		t.Fatalf("expected no rows in vt, got: %d", i)
+	}
+
+	_, err = db.Exec(`delete from vt where f1 = 'yes'`)
+	if err != nil {
+		t.Fatalf("expected error on delete, got nil")
+	}
+
+	// test bad column name
+	_, err = db.Exec(`insert into vt (f4) values('a')`)
+	if err == nil {
+		t.Fatalf("expected error on insert, got nil")
+	}
+
+	// insert to vt
+	res, err := db.Exec(`insert into vt (f1, f2, f3) values (115, 'b', 'c'), (116, 'd', 'e')`)
+	if err != nil {
+		t.Fatalf("expected no error on insert, got: %v", err)
+	}
+	n, err := res.RowsAffected()
+	if err != nil {
+		t.Fatalf("expected no error, got: %v", err)
+	}
+	if n != 2 {
+		t.Fatalf("expected 1 row affected, got: %d", n)
+	}
+
+	// check vt table
+	vt := updateMod.tables["vt"]
+	if len(vt.data) != 2 {
+		t.Fatalf("expected table vt to have exactly 2 rows, got: %d", len(vt.data))
+	}
+	if !reflect.DeepEqual(vt.data[0], []interface{}{int64(115), "b", "c"}) {
+		t.Fatalf("expected table vt entry 0 to be [115 b c], instead: %v", vt.data[0])
+	}
+	if !reflect.DeepEqual(vt.data[1], []interface{}{int64(116), "d", "e"}) {
+		t.Fatalf("expected table vt entry 1 to be [116 d e], instead: %v", vt.data[1])
+	}
+
+	// query vt
+	var f1 int
+	var f2, f3 string
+	err = db.QueryRow(`select * from vt where f1 = 115`).Scan(&f1, &f2, &f3)
+	if err != nil {
+		t.Fatalf("expected no error on vt query, got: %v", err)
+	}
+
+	// check column values
+	if f1 != 115 || f2 != "b" || f3 != "c" {
+		t.Errorf("expected f1==115, f2==b, f3==c, got: %d, %q, %q", f1, f2, f3)
+	}
+
+	// update vt
+	res, err = db.Exec(`update vt set f1=117, f2='f' where f3='e'`)
+	if err != nil {
+		t.Fatalf("expected no error, got: %v", err)
+	}
+	n, err = res.RowsAffected()
+	if err != nil {
+		t.Fatalf("expected no error, got: %v", err)
+	}
+	if n != 1 {
+		t.Fatalf("expected exactly one row updated, got: %d", n)
+	}
+
+	// check vt table
+	if len(vt.data) != 2 {
+		t.Fatalf("expected table vt to have exactly 2 rows, got: %d", len(vt.data))
+	}
+	if !reflect.DeepEqual(vt.data[0], []interface{}{int64(115), "b", "c"}) {
+		t.Fatalf("expected table vt entry 0 to be [115 b c], instead: %v", vt.data[0])
+	}
+	if !reflect.DeepEqual(vt.data[1], []interface{}{int64(117), "f", "e"}) {
+		t.Fatalf("expected table vt entry 1 to be [117 f e], instead: %v", vt.data[1])
+	}
+
+	// delete from vt
+	res, err = db.Exec(`delete from vt where f1 = 117`)
+	if err != nil {
+		t.Fatalf("expected no error, got: %v", err)
+	}
+	n, err = res.RowsAffected()
+	if err != nil {
+		t.Fatalf("expected no error, got: %v", err)
+	}
+	if n != 1 {
+		t.Fatalf("expected exactly one row deleted, got: %d", n)
+	}
+
+	// check vt table
+	if len(vt.data) != 1 {
+		t.Fatalf("expected table vt to have exactly 1 row, got: %d", len(vt.data))
+	}
+	if !reflect.DeepEqual(vt.data[0], []interface{}{int64(115), "b", "c"}) {
+		t.Fatalf("expected table vt entry 0 to be [115 b c], instead: %v", vt.data[0])
+	}
+
+	// check updatetest has 1 result
+	rows, err = db.Query(`select * from vt`)
+	if err != nil {
+		t.Fatalf("could not query vt, got: %v", err)
+	}
+	i, err = getRowCount(rows)
+	if err != nil {
+		t.Fatalf("expected no error, got: %v", err)
+	}
+	if i != 1 {
+		t.Fatalf("expected 1 row in vt, got: %d", i)
+	}
+}
+
+func getRowCount(rows *sql.Rows) (int, error) {
+	var i int
+	for rows.Next() {
+		i++
+	}
+	return i, nil
+}
+
+type vtabUpdateModule struct {
+	t      *testing.T
+	tables map[string]*vtabUpdateTable
+}
+
+func (m *vtabUpdateModule) Create(c *SQLiteConn, args []string) (VTab, error) {
+	if len(args) < 2 {
+		return nil, errors.New("must declare at least one column")
+	}
+
+	// get database name, table name, and column declarations ...
+	dbname, tname, decls := args[1], args[2], args[3:]
+
+	// extract column names + types from parameters declarations
+	cols, typs := make([]string, len(decls)), make([]string, len(decls))
+	for i := 0; i < len(decls); i++ {
+		n, typ := decls[i], ""
+		if j := strings.IndexAny(n, " \t\n"); j != -1 {
+			typ, n = strings.TrimSpace(n[j+1:]), n[:j]
+		}
+		cols[i], typs[i] = n, typ
+	}
+
+	// declare table
+	err := c.DeclareVTab(fmt.Sprintf(`CREATE TABLE "%s"."%s" (%s)`, dbname, tname, strings.Join(decls, ",")))
+	if err != nil {
+		return nil, err
+	}
+
+	// create table
+	vtab := &vtabUpdateTable{m.t, dbname, tname, cols, typs, make([][]interface{}, 0)}
+	m.tables[tname] = vtab
+	return vtab, nil
+}
+
+func (m *vtabUpdateModule) Connect(c *SQLiteConn, args []string) (VTab, error) {
+	return m.Create(c, args)
+}
+
+func (m *vtabUpdateModule) DestroyModule() {}
+
+type vtabUpdateTable struct {
+	t    *testing.T
+	db   string
+	name string
+	cols []string
+	typs []string
+	data [][]interface{}
+}
+
+func (t *vtabUpdateTable) Open() (VTabCursor, error) {
+	return &vtabUpdateCursor{t, 0}, nil
+}
+
+func (t *vtabUpdateTable) BestIndex(cst []InfoConstraint, ob []InfoOrderBy) (*IndexResult, error) {
+	return &IndexResult{Used: make([]bool, len(cst))}, nil
+}
+
+func (t *vtabUpdateTable) Disconnect() error {
+	return nil
+}
+
+func (t *vtabUpdateTable) Destroy() error {
+	return nil
+}
+
+func (t *vtabUpdateTable) Insert(id interface{}, vals []interface{}) (int64, error) {
+	var i int64
+	if id == nil {
+		i, t.data = int64(len(t.data)), append(t.data, vals)
+		return i, nil
+	}
+
+	var ok bool
+	i, ok = id.(int64)
+	if !ok {
+		return 0, fmt.Errorf("id is invalid type: %T", id)
+	}
+
+	t.data[i] = vals
+
+	return i, nil
+}
+
+func (t *vtabUpdateTable) Update(id interface{}, vals []interface{}) error {
+	i, ok := id.(int64)
+	if !ok {
+		return fmt.Errorf("id is invalid type: %T", id)
+	}
+
+	if int(i) >= len(t.data) || i < 0 {
+		return fmt.Errorf("invalid row id %d", i)
+	}
+
+	t.data[int(i)] = vals
+
+	return nil
+}
+
+func (t *vtabUpdateTable) Delete(id interface{}) error {
+	i, ok := id.(int64)
+	if !ok {
+		return fmt.Errorf("id is invalid type: %T", id)
+	}
+
+	if int(i) >= len(t.data) || i < 0 {
+		return fmt.Errorf("invalid row id %d", i)
+	}
+
+	t.data = append(t.data[:i], t.data[i+1:]...)
+
+	return nil
+}
+
+type vtabUpdateCursor struct {
+	t *vtabUpdateTable
+	i int
+}
+
+func (c *vtabUpdateCursor) Column(ctxt *SQLiteContext, col int) error {
+	switch x := c.t.data[c.i][col].(type) {
+	case []byte:
+		ctxt.ResultBlob(x)
+	case bool:
+		ctxt.ResultBool(x)
+	case float64:
+		ctxt.ResultDouble(x)
+	case int:
+		ctxt.ResultInt(x)
+	case int64:
+		ctxt.ResultInt64(x)
+	case nil:
+		ctxt.ResultNull()
+	case string:
+		ctxt.ResultText(x)
+	default:
+		ctxt.ResultText(fmt.Sprintf("%v", x))
+	}
+
+	return nil
+}
+
+func (c *vtabUpdateCursor) Filter(ixNum int, ixName string, vals []interface{}) error {
+	return nil
+}
+
+func (c *vtabUpdateCursor) Next() error {
+	c.i++
+	return nil
+}
+
+func (c *vtabUpdateCursor) EOF() bool {
+	return c.i >= len(c.t.data)
+}
+
+func (c *vtabUpdateCursor) Rowid() (int64, error) {
+	return int64(c.i), nil
+}
+
+func (c *vtabUpdateCursor) Close() error {
+	return nil
+}