PHP and MySQL interactive function table Learning notes

Recently has been studying PHP and MySQL, the feeling of PHP and MySQL interaction functions are procedural, of course, there are mysqli extensions, object-oriented, Java and C # after writing more, then write PHP, some do not adapt, feeling back to the era of the school C. Today, I learned some functions and recorded them so that we can forget them later.

$query = "SELECT ID, name from MyTable order by name ";

$result = mysql_query ($query);

while ($row = Mysql_fetch_array ($result, Mysql_assoc)) {

$id = $row ["id"];

$name = $row [' name '];

Echo Name: $name ($id) <br/> ";

}

mysql_connect ("localhost", "username", "password" );

$tables = mysql_list_tables ("MyDatabase");

while (list ($table) = Mysql_fetch_row ($tables)) {

echo $table <br/>;

}

TD style= "BORDER:0;PADDING:0;" >array mysql_fetch_array (Resource result_set [, int result_type]) The values for TD style= "BORDER:0;PADDING:0;" >resource mysql_list_tables (String database [, Resource link_id])

Description	The name of the function	function detail	Function description
Establishing a database connection	Mysql_connect ()	Resource mysql_connect ([string hostname [:p ort] [:/path/to/socket] [, string username] [, string password]]) Example: $conn = @mysql_connect ("localhost", "username", "password") or dir ("Cannot connect to MySQL Server");	Close connection that must be displayed with this connection
Establishing a database connection	Mysql_pconnect ()	Resource Mysql_pconnect ([string hostname [:p ort] [:/path/to/socket] [, string username] [, string password]]) Example: $conn = @mysql_pconnect ("localhost", "username", "password") or dir ("Cannot connect to MySQL Server");	You do not need to display a closed connection using this connection function, which is equivalent to using a connection pool
To close a database connection	Mysql_close ()	$conn = @mysql_connect ("localhost", "username", "password") or Die ("Cannot connect to MySQL Server"); @mysql_select_db ("MyDatabase") or Die ("cannot select this database, or the database does not exist"); echo "You have connected to the MyDatabase database"; Mysql_close ();
Select database	mysql_select_db ()	boolean mysql_select_db (String db_name [, Resource link_id]) $conn = @mysql_connect ("localhost", "username", " Password ") or Die (" Cannot connect to MySQL Server "); @mysql_select_db ("MyDatabase") or Die ("cannot select this database, or the database does not exist");
query mysql	mysql_query ()	resource mysql_query (string query, [resource link_id]) $linkId = @mysql_connect ("localhost", "username", "password" Or Die ("Cannot connect to MySQL Server"); @mysql_select_db ("MyDatabase") or Die ("cannot select this database, or the database does not exist"); $query = "SELECT * from MyTable"; $result = mysql_query ($query); Mysql_close ();	If the SQL query executes successfully, the resource identifier is returned and false when it fails. Returns true if the update succeeds, or false
query mysql	mysql_db_query ()	resource mysql_db_query (String database, string query [, Resource link_id]) $linkId = @mysql_connect ("localhost", "us Ername "," password ") or Die (" Cannot connect to MySQLServer "); $query = "SELECT * from MyTable"; $result = mysql_db_query ("MyDatabase", $query); Mysql_close ();	to make the code clear, it is not recommended to use this function to call
	mysql_result ()	mixed mysql_result (Resource result_set, int row [, mixed field]) $query = "SELECT ID, name from MyTable order by name "; $result = mysql_query ($query); $c _id = mysql_result ($result, 0, "id"); $c _name = mysql_result ($result, 0, "name");	The simplest and least efficient data-fetching function
	mysql_fetch_row ()	array mysql_fetch_row (Resource result_set) $query = "SELECT ID, name from MyTable order by name"; $result = mysql_query ($query); while ($id, $name) = Mysql_fetch_row ($result)) { Echo ("Name: $name ($id) <br/>"); The }
	mysql_fetch_array ()	result_type are: Mysql_assoc: Field names represent keys, field contents are values Mysql_num: A numeric index array that operates as Mysql_both as the Mysql_fetch_ros () function: That is, as an associative array and returned as a numeric index array. The default value of the Result_type.
Getting and displaying data	MYSQL_FETCH_ASSOC ()	Array Mysql_fetch_assoc (Resource result_set) Equivalent to calling Mysql_fetch_array (resource, MYSQL_ASSOC);
Getting and displaying data	Mysql_fetch_object ()	Object Mysql_fetch_object (Resource Result_set) $query = "SELECT ID, name from MyTable order by name"; while ($row = Mysql_fetch_object ($result)) { $id = $row->id; $name = $row->name; echo "Name: $name ($id) <br/>"; }	Same as Mysql_fetch_array () in operation
The selected record	Mysql_num_rows ()	int mysql_num_rows (Resource result_set) #query = "SELECT ID, name from MyTable where ID > 65"; $result = mysql_query ($query); echo "has". Mysql_num_rows ($result). " The ID of the record is greater than 65 ";	is only useful when determining the number of records that a select query obtains.
Affected Records	Mysql_affected_rows ()	int Mysql_affected_rows ([resource link_id]) $query = "Update MyTable set name= ' Cheneyfu ' where id>=5"; $result = mysql_query ($query); The number of records with the echo "id greater than or equal to 5 is updated:". Mysql_affected_rows ();	This function gets the number of rows affected by the Insert,update or delete update statement
Get Database list information	Mysql_list_dbs ()	Resource Mysql_list_dbs ([Resource link_id]) mysql_connect ("localhost", "username", "password"); $dbs = Mysql_list_dbs (); echo "Databases: <br/>"; while (list ($db) = Mysql_fetch_rows ($dbs)) { echo "$db <br/>"; }
Get database name	Mysql_db_name ()	String Mysql_db_name (Resource Result_set, integer index)	This function gets the name of the database at the specified index index in the returned result_set of Mysql_list_dbs ()
	mysql_list_tables ()
Get database table name	Mysql_tablename ()	String Mysql_tablename (Resource Result_set, integer index) mysql_connect ("localhost", "username", "password"); $tables = Mysql_list_tables ("MyDatabase"); $count =-1; while (+ + $count < Mysql_numrows ($tables)) { Echo Mysql_tablename ($tables, $count). " <br/> "; }	This function gets the table name at the specified index index in the returned result_set of Mysql_list_tables ()
Get field information	Mysql_fetch_field ()	Object Mysql_fetch_field (resource result [, int field_offset]) mysql_connect ("localhost", "username", "password"); mysql_select_db ("MyDatabase"); $query = "SELECT * from MyTable"; $result = mysql_query ($query); $fields = Mysql_num_fields ($result); for ($count = 0; $count < $fieds; $count + +) { $field = Mysql_fetch_field ($result, $count); echo "<p> $field->name $field->type ($field->max_length) </p>"; }	A total of 12 object properties were returned for the object: Name: Field name Table: Tables in which the fields are located Max_length: Maximum length of field Not_null: 1 If the field cannot be null, otherwise 0 Primary_key: 1 If the field is the primary key, or 0 Unique_key: 1 If the field is a unique key, or 0 Multiple_key: 1 If the field is not unique, or 0 Numeric: If the field is a numeric value of 1, otherwise 0 Blob: If the field blob is 1, otherwise 0 Type: Data type of field Unsigned: 1 If the field is unsigned, or 0 Zerofill: If the field is "0 fills" then 1, otherwise 0
Get the number of fields for a query	Mysql_num_fields ()	Integer mysql_num_fields (Resource result_set) $query = "SELECT ID, name from MyTable order by name"; $result = mysql_query ($query); echo "The number of fields in this query is:". Mysql_num_fields ($result). <br/> ";	Returns the number of fields in query Result_set
Gets the field names of all the fields in the specified table	Mysql_list_fields ()	Resource Mysql_list_fields (string database_name, string table_name [, Resource link_id]) $fields = Mysql_list_fields ("MyDatabase", "MyTable"); The number of fields in the table MyTable in the Echo database mydatabase: ". Mysql_num_fields ($fields)." <br/> ";
Gets the specified field options	Mysql_field_flags ()	String Mysql_field_flags (Resource Result_set, integer field_offset)
Gets the maximum length of the specified field	Mysql_field_len ()	Integer Mysql_field_len (Resource result_set, integer field_offset) $query = "SELECT name from MyTable"; $result = mysql_query ($query); $row = Mysql_fetch_row ($result); Echo Mysql_field_len ($result, 0). " <br/> ";	If Mysql_field_len ($reseult, 0) = 16777215 Then Numer_format (Mysql_field_len ($result)) equals 16,777,215
Get field Name	Mysql_field_name ()	String Mysql_field_name (Resource result_set, int field_offset) $query = "SELECT ID as Pkid, name from MyTable order by name"; $result = mysql_query ($query); $row = Mysql_fetch_row ($result); Echo mysql_field_name ($result, 0); Result:pkid
Get field type	Mysql_field_type ()	String Mysql_field_type (Resource result_set, int field_offset) $query = "SELECT ID, name from MyTable order by name"; $result = mysql_query ($query); $row = Mysql_fetch_row ($result); Echo Mysql_field_type ($result, 0); Result:int
Get the table name of the field	Mysql_field_table ()	String mysql_field_table (Resource result_set, int field_offset) $query = "SELECT ID as Pkid, name from MyTable order by name"; $result = mysql_query ($query); $row = Mysql_fetch_row ($result); Echo mysql_field_table ($result, 0); //