計數SQLite行

Question

如何統計SQLite數據庫表中的行數？我有一張名爲my_table的表格，它有nameinfo和number列。

Answer 1

您可以使用rawQuery count(*)，它返回表中的行數。

cursor=db.rawQuery("Select count(*) from my_table;", null); 

Answer 2

使用SELECT COUNT(*) FROM " + DB_TABLE_PLACES查詢來獲取表中的 例

private static final String DB_TABLE_PLACES = "my_table"; 
private SQLiteDatabase mDatabase; 

private long fetchPlacesCount() { 
    String sql = "SELECT COUNT(*) FROM " + DB_TABLE_PLACES; 
    SQLiteStatement statement = mDatabase.compileStatement(sql); 
    long count = statement.simpleQueryForLong(); 
    return count; 
}