MySQL是一種廣泛使用的關系型數據庫管理系統，被許多大型網站和應用程序使用。但是，你可能好奇MySQL是用哪種語言進行編寫的?

事實上，MySQL的底層是用C語言進行編寫的。C語言因其高效性和跨平臺性而備受青睞，因此被用于許多操作系統內核、應用程序和數據庫的開發。

/*
 * mysql-common/dundle/my_malloc.c
 * 
 * Copyright (c) 2000-2021, Oracle and/or its affiliates.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */
...
void *my_malloc(size_t size, myf MyFlags ATTRIBUTE_UNUSED)
{
void *ptr;
DBUG_ENTER("my_malloc");
if (UNLIKELY(!size))
{
DBUG_PRINT("error", ("required size is zero"));
ptr = NULL;
}
else
{
ptr = malloc(size);
if (UNLIKELY(!ptr))
my_error_reporter(MYF(ME_OUT_OF_MEMORY),
"malloc(%lu) failed", (ulong) size);
else
mem_root_statistic(ptr, size);
}
DBUG_RETURN(ptr);
}
...

在這里，你可以看到MySQL的一個代碼片段，其中包括用C語言編寫的my_malloc函數。