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maxdb_affected_rows> <tanh
Last updated: Mon, 29 Oct 2007

LXXXII. MaxDB PHP Extension

简介

The MaxDB PHP extension allows you to access the functionality provided by MaxDB 7.5.0 and above. More information about the MaxDB Database server can be found at » http://www.mysql.com/products/maxdb/.

The MaxDB PHP extension is compatible to the MySQL mysqli extension. There are only minor differences in the behaviour of some functions due to the differences of the underlying database servers, MaxDB and MySQL.

The main differences to mysqli are in the following functions:

maxdb_character_set_name() - Returns only ascii or unicode.
maxdb_get_client_info() - Returns a different version string.
maxdb_get_client_version() - Returns a different version string.
maxdb_get_host_info() - Returns localhost or hostname.
maxdb_get_server_info() - Returns a different version string.
maxdb_get_server_version() - Returns a different version string.
maxdb_kill() - Only disconnects the session.
maxdb_multi_query() - Can not handle multiple SQL statements.
maxdb_next_result() - Function returns always false.
maxdb_options() - Supports a different set of options.
maxdb_report() - Supports a different report mode.
maxdb_stat() - Returns a different system status string.
maxdb_stmt_store_result() - Is not necessary for MaxDB.
maxdb_store_result() - Is not necessary for MaxDB.

Documentation for MaxDB can be found at » http://dev.mysql.com/doc/maxdb/.

需求

In order to have these functions available, you must compile PHP with MaxDB support. Additionally, you must have the MaxDB SQLDBC runtime library available to access the MaxDB server.

Documentation for MaxDB SQLDBC can be found at » http://dev.mysql.com/doc/maxdb/.

Download the MaxDB SQLDBC package from » http://dev.mysql.com/downloads/maxdb/clients.html.

安装

By using the --with-maxdb[=DIR] configuration option you enable PHP to access MaxDB databases. [DIR] points to the directory that contains the installed MaxDB SQLDBC package.

Windows users will need to enable php_maxdb.dll inside of php.ini.

运行时配置

这些函数的行为受 php.ini 的影响。

表141.MaxDB Configuration Options

NameDefaultChangeableChangelog
maxdb.default_hostNULLPHP_INI_ALL
maxdb.default_dbNULLPHP_INI_ALL
maxdb.default_userNULLPHP_INI_ALL
maxdb.default_pwNULLPHP_INI_ALL
maxdb.long_readlen"200"PHP_INI_ALL

有关 PHP_INI_* 常量进一步的细节与定义参见附录H, php.ini 配置选项。

以下是配置选项的简要解释。

maxdb.default_host string

The default server host to use when connecting to the database server if no other host is specified.

maxdb.default_db string

The default server database to use when connecting if no other database is specified.

maxdb.default_user string

The default user name to use when connecting to the database server if no other name is specified.

maxdb.default_pw string

The default password to use when connecting to the database server if no other password is specified.

maxdb.long_readlen integer

The default maximum length of bytes that is transferred to the client if long data is retrieved from the MaxDB database server.

预定义类

maxdb

Represents a connection between PHP and a MaxDB database.

构造函数

  • maxdb - construct a new maxdb object

方法

  • autocommit - turns on or off auto-commiting database modifications

  • change_user - changes the user of the specified database connection

  • character_set_name - returns the default character set for the database connection

  • close - closes a previously opened connection

  • commit - commits the current transaction

  • connect - opens a new connection to MaxDB database server

  • debug - performs debugging operations

  • dump_debug_info - dumps debug information

  • get_client_info - returns client version

  • get_host_info - returns type of connection used

  • get_server_info - returns version of the MaxDB server

  • get_server_version - returns version of the MaxDB server

  • init - initializes maxdb object

  • info - retrieves information about the most recently executed query

  • kill - asks the server to kill a MaxDB thread

  • multi_query - performs multiple queries

  • more_results - check if more results exist from currently executed multi-query

  • next_result - reads next result from currently executed multi-query

  • options - set options

  • ping - pings a server connection or reconnects if there is no connection

  • prepare - prepares a SQL query

  • query - performs a query

  • real_connect - attempts to open a connection to MaxDB database server

  • escape_string - escapes special characters in a string for use in a SQL statement, taking into account the current charset of the connection

  • rollback - rolls back the current transaction

  • select_db - selects the default database

  • ssl_set - sets ssl parameters

  • stat - gets the current system status

  • stmt_init- initializes a statement for use with maxdb_stmt_prepare

  • store_result - transfers a resultset from last query

  • use_result - transfers an unbuffered resultset from last query

  • thread-safe - returns whether thread safety is given or not

属性

  • affected_rows - gets the number of affected rows in a previous MaxDB operation

  • client_info - returns the MaxDB client version as a string

  • client_version - returns the MaxDB client version as an integer

  • errno - returns the error code for the most recent function call

  • error - returns the error string for the most recent function call

  • field_count - returns the number of columns for the most recent query

  • host_info - returns a string representing the type of connection used

  • info - retrieves information about the most recently executed query

  • insert_id - returns the auto generated id used in the last query

  • protocol_version - returns the version of the MaxDB protocol used

  • sqlstate - returns a string containing the SQLSTATE error code for the last error

  • thread_id - returns the thread ID for the current connection

  • warning_count - returns the number of warnings generated during execution of the previous SQL statement

maxdb_stmt

Represents a prepared statement.

方法

  • bind_param - binds variables to a prepared statement

  • bind_result - binds variables to a prepared statement for result storage

  • close - closes a prepared statement

  • data-seek - seeks to an arbitrary row in a statement result set

  • execute - executes a prepared statement

  • fetch - fetches result from a prepared statement into bound variables

  • free_result - frees stored result memory for the given statement handle

  • result_metadata - retrieves a resultset from a prepared statement for metadata information

  • prepare - prepares a SQL query

  • send_long_data - sends data in chunks

  • close_long_data - end sending long data

  • reset - resets a prepared statement

  • store_result - buffers complete resultset from a prepared statement

属性

  • affected_rows - returns affected rows from last statement execution

  • errno - returns errorcode for last statement function

  • errno - returns errormessage for last statement function

  • param_count - returns number of parameter for a given prepare statement

  • sqlstate - returns a string containing the SQLSTATE error code for the last statement function

maxdb_result

Represents the result set obtained from a query against the database.

方法

  • close - closes resultset

  • data_seek - moves internal result pointer

  • fetch_field - gets column information from a resultset

  • fetch_fields - gets information for all columns from a resulset

  • fetch_field_direct - gets column information for specified column

  • fetch_array - fetches a result row as an associative array, a numeric array, or both.

  • fetch_assoc - fetches a result row as an associative array

  • fetch_object - fetches a result row as an object

  • fetch_row - gets a result row as an enumerated array

  • close - frees result memory

  • field_seek - set result pointer to a specified field offset

属性

资源类型

This extension defines resources.

预定义常量

以下常量由本扩展模块定义，因此只有在本扩展模块被编译到 PHP 中，或者在运行时被动态加载后才有效。

The following constants to use with maxdb_options() are defined. For further description of these constants see » http://dev.mysql.com/doc/maxdb/.

表142.MaxDB PHP client constants

ConstantDescription
MAXDB_COMPNAMEThe component name used to initialise the SQLDBC runtime environment.
MAXDB_APPLICATIONThe application to be connected to the database.
MAXDB_APPVERSIONThe version of the application.
MAXDB_SQLMODEThe SQL mode.
MAXDB_UNICODETRUE, if the connection is an unicode (UCS2) client or FALSE, if not.
MAXDB_TIMEOUT The maximum allowed time of inactivity after which the connection to the database is closed by the system.
MAXDB_ISOLATIONLEVEL Specifies whether and how shared locks and exclusive locks are implicitly requested or released.
MAXDB_PACKETCOUNT The number of different request packets used for the connection.
MAXDB_STATEMENTCACHESIZE The number of prepared statements to be cached for the connection for re-use.
MAXDB_CURSORPREFIX The prefix to use for result tables that are automatically named.

The function maxdb_fetch_array() uses a constant for the different types of result arrays. The following constants are defined:

表143.MaxDB fetch constants

ConstantDescription
MAXDB_ASSOC Columns are returned into the array having the fieldname as the array index.
MAXDB_ASSOC_UPPER Columns are returned into the array having the upper case fieldname as the array index.
MAXDB_ASSOC_LOWER Columns are returned into the array having the lower case fieldname as the array index.
MAXDB_BOTH Columns are returned into the array having both a numerical index and the fieldname as the array index.
MAXDB_NUM Columns are returned into the array having a numerical index to the fields. This index starts with 0, the first field in the result.

范例

All examples in the MaxDB PHP documentation use the HOTELDB demo database from MaxDB. More about this database can be found at » http://dev.mysql.com/doc/maxdb/en/98/11b83fa6b33c17e10000000a114084/frameset.htm.

To use the examples in the MaxDB PHP documentation, you have to load the tutorial data into your database. Then you have to set maxdb.default_db in php.ini to the database that contains the tutorial data.

This simple example shows how to connect, execute a query, print resulting rows and disconnect from a MaxDB database.

例1069.MaxDB extension overview example

<?php
$link = maxdb_connect("localhost", "MONA", "RED", "DEMODB");
 
/* check connection */
if (maxdb_connect_errno()) {
 printf("Connect failed: %s\n", maxdb_connect_error());
 exit();
}

/* Performing SQL query */
$query = "SELECT * FROM hotel.city";
$result = maxdb_query($link, $query) or die("Query failed : " . maxdb_error());

/* Printing results in HTML */
echo "<table>\n";
while ($line = maxdb_fetch_array($result, MAXDB_ASSOC)) {
  echo " <tr>\n";
  foreach ($line as $col_value) {
   echo "  <td>$col_value</td>\n";
  }
  echo " </tr>\n";
}
echo "</table>\n";

/* Free resultset */
maxdb_free_result($result);

/* Closing connection */
maxdb_close($link);
?>

The following example shows how to bind variables to a SELECT INTO statement.

例1070.Example for use of SELECT INTO statements

<?php
$link = maxdb_connect("localhost", "MONA", "RED", "DEMODB");

/* check connection */
if (!$link) {
 printf("Connect failed: %s\n", maxdb_connect_error());
 exit();
}
 
/* Performing SQL query */
$stmt = maxdb_prepare ($link, "SELECT percentage INTO ? FROM hotel.countrylanguage where language = ?");
if (!$stmt) {
 printf ("Prepare failed: %s\n", maxdb_error($link));
}

$name = "Mbundu";

maxdb_stmt_bind_param($stmt, 'ds', $percentage, $name);
maxdb_stmt_execute($stmt);

printf ("%f\n", $percentage);

maxdb_stmt_close ($stmt);
?>

The following example shows how to use MaxDB database procedures.

例1071.Example fore using database procedures

<?php
$link = maxdb_connect("localhost", "MONA", "RED", "DEMODB");

/* check connection */
if (!$link) {
 printf("Connect failed: %s\n", maxdb_connect_error());
 exit();
}

maxdb_report (MAXDB_REPORT_OFF);
maxdb_query($link,"DROP DBPROC test_proc");
maxdb_report (MAXDB_REPORT_ERROR);

$query = "create dbproc test_proc (INOUT e_text char(72)) AS select * from SYSDBA.DUAL; fetch into :e_text;";

maxdb_query($link, $query);

/* Performing SQL query */
$stmt = maxdb_prepare ($link, "CALL test_proc (?)");
if (!$stmt) {
 printf ("Prepare failed: %s\n", maxdb_error($link));
}

maxdb_stmt_bind_param($stmt, 's', $result);
maxdb_stmt_execute($stmt);

printf ("%s\n", $result);

maxdb_stmt_close ($stmt);
?>

目录

maxdb_affected_rows Gets the number of affected rows in a previous MaxDB operation
maxdb_autocommit Turns on or off auto-commiting database modifications
maxdb_bind_param 别名 maxdb_stmt_bind_param()
maxdb_bind_result 别名 maxdb_stmt_bind_result()
maxdb_change_user Changes the user of the specified database connection
maxdb_character_set_name Returns the default character set for the database connection
maxdb_client_encoding 别名 maxdb_character_set_name()
maxdb_close_long_data 别名 maxdb_stmt_close_long_data()
maxdb_close Closes a previously opened database connection
maxdb_commit Commits the current transaction
maxdb_connect_errno Returns the error code from last connect call
maxdb_connect_error Returns a string description of the last connect error
maxdb_connect Open a new connection to the MaxDB server
maxdb_data_seek Adjusts the result pointer to an arbitary row in the result
maxdb_debug Performs debugging operations
maxdb_disable_reads_from_master Disable reads from master
maxdb_disable_rpl_parse Disable RPL parse
maxdb_dump_debug_info Dump debugging information into the log
maxdb_embedded_connect Open a connection to an embedded MaxDB server
maxdb_enable_reads_from_master Enable reads from master
maxdb_enable_rpl_parse Enable RPL parse
maxdb_errno Returns the error code for the most recent function call
maxdb_error Returns a string description of the last error
maxdb_escape_string 别名 maxdb_real_escape_string()
maxdb_execute 别名 maxdb_stmt_execute()
maxdb_fetch_array Fetch a result row as an associative, a numeric array, or both
maxdb_fetch_assoc Fetch a result row as an associative array
maxdb_fetch_field_direct Fetch meta-data for a single field
maxdb_fetch_field Returns the next field in the result set
maxdb_fetch_fields Returns an array of resources representing the fields in a result set
maxdb_fetch_lengths Returns the lengths of the columns of the current row in the result set
maxdb_fetch_object Returns the current row of a result set as an object
maxdb_fetch_row Get a result row as an enumerated array
maxdb_fetch 别名 maxdb_stmt_fetch()
maxdb_field_count Returns the number of columns for the most recent query
maxdb_field_seek Set result pointer to a specified field offset
maxdb_field_tell Get current field offset of a result pointer
maxdb_free_result Frees the memory associated with a result
maxdb_get_client_info Returns the MaxDB client version as a string
maxdb_get_client_version Get MaxDB client info
maxdb_get_host_info Returns a string representing the type of connection used
maxdb_get_metadata 别名 maxdb_stmt_result_metadata()
maxdb_get_proto_info Returns the version of the MaxDB protocol used
maxdb_get_server_info Returns the version of the MaxDB server
maxdb_get_server_version Returns the version of the MaxDB server as an integer
maxdb_info Retrieves information about the most recently executed query
maxdb_init Initializes MaxDB and returns an resource for use with maxdb_real_connect
maxdb_insert_id Returns the auto generated id used in the last query
maxdb_kill Disconnects from a MaxDB server
maxdb_master_query Enforce execution of a query on the master in a master/slave setup
maxdb_more_results Check if there any more query results from a multi query
maxdb_multi_query Performs a query on the database
maxdb_next_result Prepare next result from multi_query
maxdb_num_fields Get the number of fields in a result
maxdb_num_rows Gets the number of rows in a result
maxdb_options Set options
maxdb_param_count 别名 maxdb_stmt_param_count()
maxdb_ping Pings a server connection, or tries to reconnect if the connection has gone down
maxdb_prepare Prepare a SQL statement for execution
maxdb_query Performs a query on the database
maxdb_real_connect Opens a connection to a MaxDB server
maxdb_real_escape_string Escapes special characters in a string for use in a SQL statement, taking into account the current charset of the connection
maxdb_real_query Execute an SQL query
maxdb_report Enables or disables internal report functions
maxdb_rollback Rolls back current transaction
maxdb_rpl_parse_enabled Check if RPL parse is enabled
maxdb_rpl_probe RPL probe
maxdb_rpl_query_type Returns RPL query type
maxdb_select_db Selects the default database for database queries
maxdb_send_long_data 别名 maxdb_stmt_send_long_data()
maxdb_send_query Send the query and return
maxdb_server_end Shut down the embedded server
maxdb_server_init Initialize embedded server
maxdb_set_opt 别名 maxdb_options()
maxdb_sqlstate Returns the SQLSTATE error from previous MaxDB operation
maxdb_ssl_set Used for establishing secure connections using SSL
maxdb_stat Gets the current system status
maxdb_stmt_affected_rows Returns the total number of rows changed, deleted, or inserted by the last executed statement
maxdb_stmt_bind_param Binds variables to a prepared statement as parameters
maxdb_stmt_bind_result Binds variables to a prepared statement for result storage
maxdb_stmt_close_long_data Ends a sequence of maxdb_stmt_send_long_data()
maxdb_stmt_close Closes a prepared statement
maxdb_stmt_data_seek Seeks to an arbitray row in statement result set
maxdb_stmt_errno Returns the error code for the most recent statement call
maxdb_stmt_error Returns a string description for last statement error
maxdb_stmt_execute Executes a prepared Query
maxdb_stmt_fetch Fetch results from a prepared statement into the bound variables
maxdb_stmt_free_result Frees stored result memory for the given statement handle
maxdb_stmt_init Initializes a statement and returns an resource for use with maxdb_stmt_prepare
maxdb_stmt_num_rows Return the number of rows in statements result set
maxdb_stmt_param_count Returns the number of parameter for the given statement
maxdb_stmt_prepare Prepare a SQL statement for execution
maxdb_stmt_reset Resets a prepared statement
maxdb_stmt_result_metadata Returns result set metadata from a prepared statement
maxdb_stmt_send_long_data Send data in blocks
maxdb_stmt_sqlstate Returns SQLSTATE error from previous statement operation
maxdb_stmt_store_result Transfers a result set from a prepared statement
maxdb_store_result Transfers a result set from the last query
maxdb_thread_id Returns the thread ID for the current connection
maxdb_thread_safe Returns whether thread safety is given or not
maxdb_use_result Initiate a result set retrieval
maxdb_warning_count Returns the number of warnings from the last query for the given link


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maxdb_affected_rows> <tanh
Last updated: Mon, 29 Oct 2007