Sqlite 从mbtiles读取tile数据会生成;RangeError:Error“2006:提供的索引超出范围。”;
我正在尝试从sqlite数据库读取imagedata(它是一个mbtiles映射tiles文件) 为此,我尝试转换此php代码Sqlite 从mbtiles读取tile数据会生成;RangeError:Error“2006:提供的索引超出范围。”;,sqlite,actionscript-3,mbtiles,Sqlite,Actionscript 3,Mbtiles,我正在尝试从sqlite数据库读取imagedata(它是一个mbtiles映射tiles文件) 为此,我尝试转换此php代码 $sql = "SELECT * FROM tiles WHERE zoom_level = $zoom AND tile_column = $column AND tile_row = $row"; $q = $conn->prepare($sql); $q->execute(); $q->bindColumn(1, $zoom_level); $
$sql = "SELECT * FROM tiles WHERE zoom_level = $zoom AND tile_column = $column AND tile_row = $row";
$q = $conn->prepare($sql);
$q->execute();
$q->bindColumn(1, $zoom_level);
$q->bindColumn(2, $tile_column);
$q->bindColumn(3, $tile_row);
$q->bindColumn(4, $tile_data, PDO::PARAM_LOB);
while($q->fetch())
{
header("Content-Type: image/png");
echo $tile_data;
}
使用
_conn = new SQLConnection();
_conn.addEventListener(SQLEvent.OPEN, openHandler);
_conn.addEventListener(SQLErrorEvent.ERROR, errorHandler);
var folder:File = File.applicationDirectory;
var dbFile:File = folder.resolvePath("test.mbtiles");
_conn.openAsync(dbFile, SQLMode.READ);
function openHandler(event:SQLEvent):void
{
trace("db opened");
var selectStmt:SQLStatement = new SQLStatement();
selectStmt.sqlConnection = _conn;
selectStmt.text = "SELECT * FROM tiles WHERE zoom_level = 5 AND tile_column = 17 AND tile_row = 20";
selectStmt.execute();
}
但我得到的是“RangeError:Error#2006:提供的索引超出范围。”
有没有办法解决这个问题?
谢谢 啊哈,别紧张。
查询应该是
"SELECT CAST(tile_data AS ByteArray) as data " +
"FROM tiles WHERE " +
"zoom_level = 5 " +
"and tile_column = 17 " +
"and tile_row = 20";