android-如何将图像在Sqlite数据库中另存为blob?
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这是我用来将图片另存为database.cs中的base64String TEXT的代码.
public void CreateDatabase(string sqldb_name)
{
try
{
sqldb_message = "";
string sqldb_location = System.Environment.GetFolderPath(System.Environment.SpecialFolder.Personal);
string sqldb_path = Path.Combine(sqldb_location, sqldb_name);
bool sqldb_exists = File.Exists(sqldb_path);
if(!sqldb_exists)
{
//Adding new fields
//For adding new fields we have to define the field on the "create" query, in this case, we're adding "BirthDay" field which is VARCHAR
sqldb = SQLiteDatabase.OpenOrCreateDatabase(sqldb_path,null);
sqldb_query = "CREATE TABLE IF NOT EXISTS MyTable (_id INTEGER PRIMARY KEY AUTOINCREMENT, Art TEXT, Album VARCHAR, Artist VARCHAR, Country VARCHAR, Year INT, Genre VARCHAR, Style VARCHAR, Format VARCHAR);";
sqldb.ExecSQL(sqldb_query);
sqldb_message = "Database: " + sqldb_name + " created";
}
else
{
sqldb = SQLiteDatabase.OpenDatabase(sqldb_path, null, DatabaseOpenFlags.OpenReadwrite);
sqldb_message = "Database: " + sqldb_name + " opened";
}
sqldb_available=true;
}
catch(SQLiteException ex)
{
sqldb_message = ex.Message;
}
}
//Adds a new record with the given parameters
//Adding new fields
//We have to modify the CRUD (Create, Read, Update and Delete) operations by adding the new "BirthDay" field, in this case, we're adding the new string parameter "sBirthDay"
public void AddRecord(string @IMG, string sAlbum, string sArtist, string sCountry, int iYear, string sGenre, string sStyle, string sFormat)
{
try
{
//Adding new fields
//We have to modify the CRUD (Create, Read, Update and Delete) operations by adding the new "BirthDay" field to the query and assign the value "sBirthDay"
sqldb_query = "INSERT INTO MyTable (Art, Album, Artist, Country, Year, Genre, Style, Format) VALUES ('" + @IMG + "','" + sAlbum + "','" + sArtist + "','" + sCountry + "','" + iYear + "','" + sGenre + "','" + sStyle + "','" + sFormat + "');";
sqldb.ExecSQL(sqldb_query);
sqldb_message = "Record saved";
}
catch(SQLiteException ex)
{
sqldb_message = ex.Message;
}
}
我应该对代码进行哪些更改以将图像另存为数据库中的blob?
解决方法:
SQLite旨在包含约400KB的数据.将图像存储在SQLite Db中不会很好.上面写的图像路径方法更好.
如果适合您的需求,最好使用Picasso,Universal Image Loader等图像加载库.这样,您可以只保留图像URL.该图像由库缓存.
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