Test metadata on view and expression.

meta.go

@@ -96,6 +96,7 @@ func (c *Conn) Views(dbName string, temp bool) ([]string, error) {
 }
 
 // Indexes returns indexes from 'sqlite_master'/'sqlite_temp_master'.
+// As the index name is unique by database, (index name, table name) couples are returned.
 func (c *Conn) Indexes(dbName string, temp bool) (map[string]string, error) {
 	var sql string
 	if len(dbName) == 0 {
@@ -137,7 +138,7 @@ type Column struct {
 	CollSeq   string
 }
 
-// Columns returns a description for each column in the named table.
+// Columns returns a description for each column in the named table/view.
 // Column.Autoinc and Column.CollSeq are left unspecified.
 // (See http://www.sqlite.org/pragma.html#pragma_table_info)
 func (c *Conn) Columns(dbName, table string) ([]Column, error) {
@@ -167,7 +168,7 @@ func (c *Conn) Columns(dbName, table string) ([]Column, error) {
 	return columns, nil
 }
 
-// Column extracts metadata about a column of a table.
+// Column extracts metadata about a column of a table (doesn't work with view).
 // Column.Cid and Column.DfltValue are left unspecified.
 // (See http://sqlite.org/c3ref/table_column_metadata.html)
 func (c *Conn) Column(dbName, tableName, columnName string) (*Column, error) {
@@ -187,7 +188,6 @@ func (c *Conn) Column(dbName, tableName, columnName string) (*Column, error) {
 	if rv != C.SQLITE_OK {
 		return nil, c.error(rv, fmt.Sprintf("Conn.Column(db: %q, tbl: %q, col: %q)", dbName, tableName, columnName))
 	}
-	// TODO How to avoid copy?
 	return &Column{-1, columnName, C.GoString(zDataType), notNull == 1, "", int(primaryKey),
 		autoinc == 1, C.GoString(zCollSeq)}, nil
 }

meta_test.go

@@ -57,7 +57,7 @@ func TestViews(t *testing.T) {
 	checkNoError(t, err, "error looking for views: %s")
 	assert.Equal(t, 0, len(views), "table count")
 	err = db.FastExec("CREATE VIEW myview AS SELECT 1")
-	checkNoError(t, err, "error creating for views: %s")
+	checkNoError(t, err, "error creating view: %s")
 	views, err = db.Views("", false)
 	checkNoError(t, err, "error looking for views: %s")
 	assert.Equal(t, 1, len(views), "table count")
@@ -171,3 +171,48 @@ func TestColumnMetadata(t *testing.T) {
 	affinity := s.ColumnTypeAffinity(0)
 	assert.Equal(t, Textual, affinity, "affinity")
 }
+
+func TestColumnMetadataOnView(t *testing.T) {
+	db := open(t)
+	defer checkClose(db, t)
+	createTable(db, t)
+	err := db.FastExec("CREATE VIEW vtest AS SELECT * FROM test")
+	checkNoError(t, err, "error creating view: %s")
+
+	s, err := db.Prepare("SELECT a_string AS str FROM vtest")
+	check(err)
+	defer checkFinalize(s, t)
+
+	databaseName := s.ColumnDatabaseName(0)
+	assert.Equal(t, "main", databaseName, "database name")
+	tableName := s.ColumnTableName(0)
+	assert.Equal(t, "test", tableName, "table name")
+	originName := s.ColumnOriginName(0)
+	assert.Equal(t, "a_string", originName, "origin name")
+	declType := s.ColumnDeclaredType(0)
+	assert.Equal(t, "TEXT", declType, "declared type")
+	affinity := s.ColumnTypeAffinity(0)
+	assert.Equal(t, Textual, affinity, "affinity")
+}
+
+func TestColumnMetadataOnExpr(t *testing.T) {
+	db := open(t)
+	defer checkClose(db, t)
+	err := db.FastExec("CREATE VIEW vtest AS SELECT date('now') as tic")
+	checkNoError(t, err, "error creating view: %s")
+
+	s, err := db.Prepare("SELECT tic FROM vtest")
+	check(err)
+	defer checkFinalize(s, t)
+
+	databaseName := s.ColumnDatabaseName(0)
+	assert.Equal(t, "", databaseName, "database name")
+	tableName := s.ColumnTableName(0)
+	assert.Equal(t, "", tableName, "table name")
+	originName := s.ColumnOriginName(0)
+	assert.Equal(t, "", originName, "origin name")
+	declType := s.ColumnDeclaredType(0)
+	assert.Equal(t, "", declType, "declared type")
+	affinity := s.ColumnTypeAffinity(0)
+	assert.Equal(t, None, affinity, "affinity")
+}