/// <summary>テーブルがnullまたは空</summary>
public static bool IsNullOrEmpty(SQLiteTable table)
{
return(table == null || table.Rows.Count <= 0);
}
/// <summary>ステートメントを実行して結果行列を取得</summary>
private SQLiteTable ExecuteQuery(Statement statement)
{
if (!this.IsOpen)
{
return(null);
}
var pointer = statement.Pointer;
var dataTable = new SQLiteTable();
// 列の生成
int columnCount = sqlite3_column_count(pointer);
for (int i = 0; i < columnCount; i++)
{
string columnName = Marshal.PtrToStringAnsi(sqlite3_column_name(pointer, i));
dataTable.AddColumn(columnName, SQLiteColumnType.SQLITE_UNKNOWN);
}
// 行の生成
object [] row = new object [columnCount];
while (sqlite3_step(pointer) == SQLiteResultCode.SQLITE_ROW)
{
for (int i = 0; i < columnCount; i++)
{
if (dataTable.Columns [i].Type == SQLiteColumnType.SQLITE_UNKNOWN || dataTable.Columns [i].Type == SQLiteColumnType.SQLITE_NULL)
{
dataTable.Columns [i].Type = sqlite3_column_type(pointer, i);
}
switch (dataTable.Columns [i].Type)
{
case SQLiteColumnType.SQLITE_INTEGER:
row [i] = sqlite3_column_int(pointer, i);
break;
case SQLiteColumnType.SQLITE_TEXT:
IntPtr text = sqlite3_column_text(pointer, i);
row [i] = Marshal.PtrToStringAnsi(text);
break;
case SQLiteColumnType.SQLITE_FLOAT:
row [i] = sqlite3_column_double(pointer, i);
break;
case SQLiteColumnType.SQLITE_BLOB:
IntPtr blob = sqlite3_column_blob(pointer, i);
int size = sqlite3_column_bytes(pointer, i);
byte [] data = new byte [size];
Marshal.Copy(blob, data, 0, size);
row [i] = data;
break;
case SQLiteColumnType.SQLITE_NULL:
row [i] = null;
break;
default:
row [i] = null;
break;
}
}
dataTable.AddRow(row);
}
return(dataTable);
}
