[mysql浣跨敤浠€涔堝嚱鏁版潵鎵цmysql璇彞] mysql 自定义函数if语句

mysql浣跨敤浠€涔堝嚱鏁版潵鎵цmysql璇彞

瀹氫箟鍜岀敤娉?/p>

mysql_query() 鍑芥暟鎵ц涓€鏉?MySQL 鏌ヨ銆?/p>

璇硶

mysql_query(query,connection)鍙傛暟 鎻忚堪

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connection 鍙€夈€傝瀹?SQL 杩炴帴鏍囪瘑绗︺€傚鏋滄湭瑙勫畾锛屽垯浣跨敤涓婁竴涓墦寮€鐨勮繛鎺ャ€?/p>

璇存槑

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杩斿洖鍊?/p>

mysql_query() 浠呭 SELECT锛孲HOW锛孍XPLAIN 鎴?DESCRIBE 璇彞杩斿洖涓€涓祫婧愭爣璇嗙锛屽鏋滄煡璇㈡墽琛屼笉姝g‘鍒欒繑鍥?FALSE銆?/p>

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闈?FALSE 鐨勮繑鍥炲€兼剰鍛崇潃鏌ヨ鏄悎娉曠殑骞惰兘澶熻鏈嶅姟鍣ㄦ墽琛屻€傝繖骞朵笉璇存槑浠讳綍鏈夊叧褰卞搷鍒扮殑鎴栬繑鍥炵殑琛屾暟銆傚緢鏈夊彲鑳戒竴鏉℃煡璇㈡墽琛屾垚鍔熶簡浣嗗苟鏈奖鍝嶅埌鎴栧苟鏈繑鍥炰换浣曡銆?/p>

鎻愮ず鍜屾敞閲?/p>

娉ㄩ噴锛氳鍑芥暟鑷姩瀵硅褰曢泦杩涜璇诲彇鍜岀紦瀛樸€傚闇€杩愯闈炵紦瀛樻煡璇紝璇蜂娇鐢?mysql_unbuffered_query()銆?/p>

渚嬪瓙 1

$con = mysql_connect("localhost","mysql_user","mysql_pwd");

if (!$con)

{

die("Could not connect: " . mysql_error());

}

$sql = "SELECT * FROM Person";

mysql_query($sql,$con);

// 涓€浜涗唬鐮?/p>

mysql_close($con);

?>

渚嬪瓙 2

閫氳繃 mysql_query() 鍑芥暟鍒涘缓涓€涓柊鏁版嵁搴擄細

$con = mysql_connect("localhost","mysql_user","mysql_pwd");

if (!$con)

{

die("Could not connect: " . mysql_error());

}

$sql = "CREATE DATABASE my_db";

if (mysql_query($sql,$con))

{

echo "Database my_db created";

}

else

{

echo "Error creating database: " . mysql_error();

}

?>