Return a verifiable error if no results were returned

errors.go

@@ -0,0 +1,5 @@
+package mysqlite
+
+import "errors"
+
+var ErrNoRows = errors.New("mysqlite: no rows returned")

migrator.go

@@ -42,7 +42,7 @@ func (d *Db) MigrateDb(filesystem ReadDirFileFS, directory string) error {
 	log.Printf("Current version is %d, max migration version is %d", currentVersion, latestVersion)
 
 	// Create a backup if we're not on the latest version
-	if currentVersion != latestVersion && d.source != ":memory:" {
+	if currentVersion != 0 && currentVersion != latestVersion && d.source != ":memory:" {
 		target := d.source + ".backup." + strconv.Itoa(currentVersion)
 		log.Printf("Creating backup of database to %s", target)
 		data, err := d.Db.Serialize("main")

query.go

@@ -34,23 +34,39 @@ func (d *Db) query(query string) *Query {
 }
 
 func (q *Query) Bind(args ...any) *Query {
+	into := 0
+	return q.bindInto(&into, args...)
+}
+
+func (q *Query) bindInto(into *int, args ...any) *Query {
 	if q.err != nil || q.stmt == nil {
 		return q
 	}
 	for i, arg := range args {
+		*into++
 		if asString, ok := arg.(string); ok {
-			q.stmt.BindText(i+1, asString)
+			q.stmt.BindText(*into, asString)
 		} else if asInt, ok := arg.(int); ok {
-			q.stmt.BindInt64(i+1, int64(asInt))
+			q.stmt.BindInt64(*into, int64(asInt))
 		} else if asInt, ok := arg.(int64); ok {
-			q.stmt.BindInt64(i+1, asInt)
+			q.stmt.BindInt64(*into, asInt)
 		} else if asBool, ok := arg.(bool); ok {
-			q.stmt.BindBool(i+1, asBool)
+			q.stmt.BindBool(*into, asBool)
 		} else {
+			// Check if the argument is a slice or array of any type
+			v := reflect.ValueOf(arg)
+			if v.Kind() == reflect.Slice || v.Kind() == reflect.Array {
+				*into--
+				for i := 0; i < v.Len(); i++ {
+					q.bindInto(into, v.Index(i).Interface())
+				}
+			} else {
+				*into--
 				q.err = fmt.Errorf("unsupported column type %s at index %d", reflect.TypeOf(arg).Name(), i)
 				return q
 			}
 		}
+	}
 	return q
 }
 
@@ -100,7 +116,7 @@ func (q *Query) ScanSingle(results ...any) (rerr error) {
 		return err
 	}
 	if !hasResult {
-		return fmt.Errorf("did not return any rows")
+		return ErrNoRows
 	}
 
 	// Scan its columns
@@ -138,6 +154,9 @@ type Rows struct {
 }
 
 func (q *Query) ScanMulti() (*Rows, error) {
+	if q.err != nil {
+		return nil, q.err
+	}
 	return &Rows{
 		query: q,
 	}, nil

query_test.go

@@ -1,6 +1,7 @@
 package mysqlite
 
 import (
+	"errors"
 	"github.com/stretchr/testify/require"
 	"testing"
 )
@@ -19,6 +20,14 @@ func TestSimpleQuery(t *testing.T) {
 	require.Equal(t, 1, count, "expected empty count")
 }
 
+func TestSimpleQueryWithNoResults(t *testing.T) {
+	db := openTestDb(t)
+	var count int
+	err := db.Query("select 1 from mytable where key=999").ScanSingle(&count)
+	require.Equal(t, ErrNoRows, err)
+	require.True(t, errors.Is(err, ErrNoRows))
+}
+
 func TestSimpleQueryWithArgs(t *testing.T) {
 	db := openTestDb(t)
 	var value string
@@ -102,7 +111,7 @@ func TestQueryWithPointerStringArguments(t *testing.T) {
 
 func TestQueryWithPointerStringArgumentsCanSetToNull(t *testing.T) {
 	db := openTestDb(t)
-	db.Query("update mytable set value=NULL where key = 'foo'").MustExec()
+	db.Query("update mytable set value=null where key = 'foo'").MustExec()
 	myString := "some string"
 	var result *string
 	result = &myString
@@ -133,3 +142,29 @@ func TestTransactionRollback(t *testing.T) {
 	db.Query("select value from mytable where key = 'foo'").MustScanSingle(&value)
 	require.Equal(t, "bar", value, "expected original value after rollback")
 }
+
+func TestQueryWithInClause(t *testing.T) {
+	db := openTestDb(t)
+	// Insert additional test rows
+	db.Query("insert into mytable(key, value) values ('key1', 'value1')").MustExec()
+	db.Query("insert into mytable(key, value) values ('key2', 'value2')").MustExec()
+
+	// Execute query with IN clause
+	args := []string{"foo", "key2"}
+	rows, err := db.Query("select key, value from mytable where key in (?, ?)").Bind(args).ScanMulti()
+	require.NoError(t, err)
+	defer rows.MustFinish()
+
+	// Check results
+	results := make(map[string]string)
+	for rows.MustNext() {
+		var key, value string
+		rows.MustScan(&key, &value)
+		results[key] = value
+	}
+
+	// Verify we got exactly the expected results
+	require.Equal(t, 2, len(results), "expected 2 matching rows")
+	require.Equal(t, "bar", results["foo"], "unexpected value for key 'foo'")
+	require.Equal(t, "value2", results["key2"], "unexpected value for key 'key2'")
+}