Swift SQLite在Blob列中插入null

Question

我已经使用以下查询在sqlite db中创建表

let createTableQuery = """
CREATE TABLE Image(
Id INTEGER PRIMARY KEY AUTOINCREMENT,  image BLOB);
"""

使用以下方法在“图像”表中插入数据

let insertStatementString = "INSERT INTO Image (image) VALUES (?);"

func insert() {
        var insertStatement: OpaquePointer? = nil
        if sqlite3_prepare_v2(db, insertStatementString, -1, &insertStatement, nil) == SQLITE_OK {
            let image = UIImage.init(named: "item1.png")
            let data = UIImagePNGRepresentation(image!)! as NSData
            sqlite3_bind_blob(insertStatement, 2, data.bytes, Int32(data.length), SQLITE_TRANSIENT)

            if sqlite3_step(insertStatement) == SQLITE_DONE {
                print("Successfully inserted row.")
            } else {
                print("Could not insert row.")
            }
        } else {
            print("INSERT statement could not be prepared.")
        }
        sqlite3_finalize(insertStatement)
    }

当我调用此方法时，它会打印“成功插入行”。但是，当我使用DB Browser for Sqlite打开数据库时，图像列的值为NULL。

任何人都可以帮忙。