Detailed explanation of php obtaining database result set instance

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PHP often needs to access the database to advance the data in the database, so how to advance the data?

The code to extract the database is as follows:

<?php
include("conn.php");//数据库连接
$sql="select* from study_sql";//查询数据库表名为study_sql所有的数据记录
$res=mysql_query($sql);//向数据库发送一条sql语句
//$arr=mysql_fetch_row($res);//获取数据库中的第一条信息
echo &#39;<table apgn="center" width="800" border="1">&#39;;//获取的数据用表格显示出来
 echo &#39;<cabtion><h1>演示表</h1></cabtion>&#39;;
 while($arr=mysql_fetch_assoc($res)){//取出表study_sql中的所有结果集
  echo &#39;<tr>&#39;;
  foreach($arr as $col){//遍历数据
   echo &#39;<td>&#39;.$col.&#39;</td>&#39;;
  }
  echo "</tr>";
 }
?>

##Commonly used SQL functions are as follows:

mysql_affected_rows — Get the number of record rows affected by the previous MySQL operation

mysql_cpent_encoding — Return the name of the character set

mysql_close — Close the MySQL connection

mysql_connect — Open a connection to the MySQL server

mysql_create_db — Create a new MySQL database

mysql_data_seek — Move internal results Pointer

mysql_db_name — Get result data

mysql_db_query — Send a MySQL query

mysql_drop_db — Drop (delete) a MySQL database

mysql_errno — Return to the previous one Numeric encoding of error messages in MySQL operations

mysql_error — Returns the text error message generated by the previous MySQL operation

mysql_escape_string — Escapes a string for use with mysql_query

mysql_fetch_array — Get a row from the result set as an associative array, or a numeric array, or both

mysql_fetch_assoc — Get a row from the result set as an associative array

mysql_fetch_field — Get the column information from the result set and Returned as an object

mysql_fetch_lengths — Get the length of each output in the result set

mysql_fetch_object — Get a row from the result set as an object

mysql_fetch_row — Get a row from the result set as an enumeration Array

mysql_field_flags — Get the flags associated with the specified field from the result

mysql_field_len — Return the length of the specified field

mysql_field_name — Get the field name of the specified field in the result

mysql_field_seek — Set the pointer in the result set to the specified field offset

mysql_field_table — Get the table name where the specified field is located

mysql_field_type — Get the type of the specified field in the result set

mysql_free_result — Release result memory

mysql_get_cpent_info — Get MySQL client information

mysql_get_host_info — Get MySQL host information

mysql_get_proto_info — Get MySQL protocol information

mysql_get_server_info — Get MySQL server information

mysql_info — Get the latest query information

mysql_insert_id — Get the ID generated by the previous INSERT operation

mysql_pst_dbs — List All databases in the MySQL server

mysql_pst_fields — List the fields in the MySQL results

mysql_pst_processes — List the MySQL processes

mysql_pst_tables — List the tables in the MySQL database

mysql_num_fields — Get the number of fields in the result set

mysql_num_rows — Get the number of rows in the result set

mysql_pconnect — Open a persistent connection to the MySQL server

mysql_ping — Ping a server connection, or reconnect if not connected

mysql_query — Send a MySQL query

mysql_real_escape_string — Escape special characters in a string used in an SQL statement, taking into account the connection Current character set

mysql_result — Get result data

mysql_select_db — Select MySQL database

mysql_set_charset — Set the client’s character set

mysql_stat — Get the current system status

mysql_tablename — Gets the table name

mysql_thread_id — Returns the ID of the current thread

mysql_unbuffered_query — Sends a SQL query to MySQL without retrieving and caching the result rows

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