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clear version of ten examples of dob Adodb

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Jul 29, 2016 am 08:35 AM

I originally wanted to learn pear, but I saw several posts on the Internet that rated adodb very highly, so I changed to this one.
ADODB has the following advantages (said online, not mine):
1. It is twice as fast as pear;
2. It supports many more database types than pear, and can even support ACCESS;
3. No need Installation, no server support is required (for novices, this is very important)
Friends who don’t know what adodb is or want to download adodb can go to this link: http://www.phpe.net/class/106 .shtml
In addition, if any brother has translated the full text of the README or knows where to find the translation, please reply to me, thank you.
Tutorial
Example 1: Select Statement
Task: Connect to an Access database named Northwind and display the first two fields of each record.
In this example, we created a new ADOC connection (ADOConnection) object and used it to Connect to a database. This connection uses the PConnect method, which is a persistent connection. When we want to query the database, we can call the Execute() function of this connection at any time. It will return an ADORecordSet object which is actually a cursor that holds the current row in the array fields[]. We use MoveNext() to move from one record to the next.
NB: There is a very practical function SelectLimit not used in this example, which can control the number of records displayed (such as Only the first ten records are displayed and can be used for paging display).
PHP:---------------------------------- -----------------------------------------------

include('adodb.inc.php'); #Load ADOdb
$conn = &ADONewConnection('access'); # Create a new connection
$conn->PConnect('northwind'); # Connect to a file named northwind's MS-Access database
$recordSet = &$conn->Execute('select * from products'); #Search all data from the products data table
if (!$recordSet)
print $conn->ErrorMsg (); //If an error occurs during data search, display error message
else
while (!$recordSet->EOF) {
print $recordSet->fields[0].' '.$recordSet->fields[1 ].'
';
$recordSet->MoveNext(); //Point to the next record
} //List display data
$recordSet->Close(); //Optional
$conn- >Close(); //Optional
?>
---------------------------------- ---------------------------------------------
$recordSet in $ The current array is returned in recordSet->fields, and the fields are numerically indexed (starting from 0). We use the MoveNext() function to move to the next record. When the database search reaches the end, the EOF property is set to true. If Execute() An error occurs, recordset returns false.
$recordSet->fields[] array is generated from PHP database extension. Some database extensions can only be indexed by numbers and not by field names. If you insist on using field name indexes, you should use the SetFetchMode function. Regardless of the format of the index, the recordset can be created by Execute() or SelectLimit().
PHP:---------------------------------------------------------- ----------------------------------
$db->SetFetchMode(ADODB_FETCH_NUM);
$rs1 = $db ->Execute('select * from table'); //Use numeric index
$db->SetFetchMode(ADODB_FETCH_ASSOC);
$rs2 = $db->Execute('select * from table'); // Using field name index
print_r($rs1->fields); # shows array([0]=>'v0',[1] =>'v1')
print_r($rs2->fields); # shows array(['col1']=>'v0',['col2'] =>'v1')---------------------- -------------------------------------------------- --------
If you want to get the record number, you can use $recordSet->RecordCount(). Returns -1 if there is no current record.
Example 2: Advanced Select with Field Objects
Search the table and display the first two fields. If the second field is in time or date format, change it to US standard time format.
PHP:------ -------------------------------------------------- --------------------------

include('adodb.inc.php'); ///Load adodb
$conn = &ADONewConnection('access'); //Create a new connection
$conn->PConnect('northwind'); //Connect to the MS-Access database named northwind
$recordSet = &$conn->Execute('select CustomerID,OrderDate from Orders'); //Search the CustomerID and OrderDate fields from the Orders table
if (!$recordSet)
print $conn->ErrorMsg(); //If the database search error occurs, the error message is displayed
else
while (!$recordSet->EOF) {
$fld = $recordSet->FetchField(1); //Assign the second field to $fld
$type = $recordSet->MetaType($ fld->type); //Format of getting field value
if ( $type == 'D' || $type == 'T')
print $recordSet->fields[0].' '.
$recordSet->UserDate($recordSet->fields[1],'m/d/Y').'
'; //If the field format is date or time, make it in American standard format Output
else
print $recordSet->fields[0].' '.$recordSet->fields[1].'
'; // Otherwise, output as is
$recordSet->MoveNext() ; //Point to the next record
}
$recordSet->Close(); //Optional
$conn->Close(); //Optional
?>
-------- -------------------------------------------------- --------------------------
In this example, we use the FetchField() function to check the format of the second field. It returns a field containing three The object of the variable
name: field name
type: the actual format of the field in its database
max_length: the maximum length of the field, some databases will not return this value, such as MYSQL, in this case the max_length value is equal to -1.
We use MetaType() converts the database format of the field into a standard field format
C: Character field, which should be displayed under the tag.
X: Text field, which stores relatively large fields Text, generally used in tags B: Blocks, large objects in binary format, such as pictures D: Date fields T: Time fields L: Logical fields (Boolean logic or bit-field) I: Integer field N: Numeric field. Including autoincrement, numeric, floating point, real and integer. R: Continuous field. Including serial, autoincrement integers. It can only work in the specified database. If metatype is date or timestamp type, we use the user-defined date format UserDate() function to output, UserDate() is used to convert PHP SQL date string format to user Defined format, another usage of MetaType() is to confirm data validity before inserting and replacing. Example 3: Inserting Insert a record containing date and character data in the order data table, which must be done before inserting Convert, eg: the single-quote in the word John's. PHP:---------------------------------- ----------------------------------------------- include('adodb.inc.php'); // Load adodb $conn = &ADONewConnection('access'); // Create a new connection $conn->PConnect('northwind'); // Connect to ACCESS database northwind $shipto = $conn->qstr("John's Old Shoppe"); $sql = "insert into orders (customerID,EmployeeID,OrderDate,ShipName) "; $sql .= "values ('ANATR ',2,".$conn->DBDate(time()).",$shipto)"; if ($conn->Execute($sql) === false) { print 'error inserting: '.$conn->ErrorMsg().' '; }//If the insertion is unsuccessful, output an error message ?> ------------------------------------------------ ----------------------------------------------- In this example, We see that ADOdb can easily handle some advanced database operations. The unix timestamp (a long integer) is converted to the correct Access format by DBDate(), and the right escape character is used for quoting the John's Old Shoppe, which is John's Old Shoppe and not PHP's default John's Old Shoppe with qstr(). Observe the error handling of the execution statement. If an error occurs in Execute(), the ErrorMsg() function will return the last error message. Note: php_track_errors might have to be enabled for error messages to be saved. Example 4: Debugging include('adodb.inc.php'); // Load adodb $conn = &ADONewConnection('access'); // Create a new one Connection $conn->PConnect('northwind'); //Connect to ACCESS database northwind $shipto = $conn->qstr("John's Old Shoppe"); $sql = "insert into orders (customerID, EmployeeID,OrderDate,ShipName) "; $sql .= "values ('ANATR',2,".$conn->FormatDate(time()).",$shipto)"; $conn->debug = true; if ($conn->Execute($sql) === false) print 'error inserting'; ?> In the above example, we set debug = true. It will be executed before execution Display all SQL information, and it will also display all error messages. In this example, we no longer need to call ErrorMsg(). To display the recordset, you can refer to the rs2html() example. Also refer to the Custom Error Handlers section content. Example 5: MySQL and Menus Connect to the MySQL database agora, and generate a <select> drop-down menu from the SQL statement. The <option> option of the menu is displayed as the first field, and the return value is the second field. PHP:---------------------------------------------------------- ---------------------------------- include('adodb.inc.php'); # load code common to ADOdb $conn = &ADONewConnection('mysql'); //eate a connection $conn->PConnect('localhost','userid','','agora'); //SQL database, The database name is agora $sql = 'select CustomerName, CustomerID from customers'; //Search field name is used for display, id is used for return value $rs = $conn->Execute($sql); print $rs ->GetMenu('GetCust','Mary Rosli'); //Show menu ?> -------------------------- -------------------------------------------------- ---- Here we define a menu called GetCust, in which 'Mary Rosli' is selected. See GetMenu(). We also have a function that returns the record value to an array: GetArray(), and as an associative array with the key being the first column: GetAssoc(). Example 6: Connecting to 2 Databases At Once PHP:-------------------------- -------------------------------------------------- --------- include('adodb.inc.php'); # load code common to ADOdb $conn1 = &ADONewConnection('mysql'); # create a mysql connection $conn2 = &ADONewConnection('oracle'); # create a oracle connection $conn1->PConnect($server, $userid, $password, $database); $conn2->PConnect(false, $ora_userid, $ora_pwd, $oraname); $conn1->Execute('insert ...'); $conn2->Execute('update ...'); ?> //Connect two databases at the same time -- -------------------------------------------------- ---------------------------- 7: Generating Update and Insert SQL ADODb version 1.31 or above supports two new functions: GetUpdateSQL( ) and GetInsertSQL( ). This allows you to perform a "SELECT * FROM table query WHERE...", make a copy of the $rs->fields, modify the fields, and then generate the SQL to update or insert into the table automatically. Let’s see how these two functions are performed in this worksheet: (ID, FirstName, LastName, Created). Before these functions can be called, you need to initialize the recordset by performing a select on the table. Idea and code by Jonathan Younger jyounger#unilab.com. PHP:-------------------------------- -------------------------------------------------- #============================================== == # SAMPLE GetUpdateSQL() and GetInsertSQL() code #==================================== =========== include('adodb.inc.php'); include('tohtml.inc.php'); // Strange, this sentence seems to be the same regardless of whether it is there, any friends If you know the reason, please give an explanation #========================== # This code tests an insert $sql = "SELECT * FROM ADOXYZ WHERE id = -1"; #Find an empty record $conn = &ADONewConnection("mysql"); # create a connection $conn->debug=1; $conn->PConnect("localhost", "admin ", "", "test"); # connect to MySQL, testdb $rs = $conn->Execute($sql); # Get an empty record $record = array(); # Create an array ready for insertion # Set the insertion value $record["firstname"] = "Bob"; $record["lastname"] = "Smith"; $record["created"] = time(); #PASS The EMPTY RecordSet and the Array Containing the Data to Insert #into the Getinsertsql Function. The Function Will Process The Data and Return #A F Ully Formatted Insert SQL Statement.#Formatting variables before inserting ->GetInsertSQL($rs, $record); $conn->Execute($insertSQL); # Insert data into the database #================== ======== # The following program demonstrates modifying data, which is roughly the same as the previous program $sql = "SELECT * FROM ADOXYZ WHERE id = 1"; # Select a record to update $rs = $conn->Execute($sql); # Execute the query and get the existing record to update $record = array(); # Initialize an array to hold the record data to update # Set the values for the fields in the record $record["firstname"] = "Caroline"; $record["lastname"] = "Smith"; # Update Caroline's lastname from Miranda to Smith # Pass the single record recordset and the array containing the data to update # into the GetUpdateSQL function. The function will process the data and return # a fully formatted update sql statement with the correct WHERE clause. # If the data has not changed, no recordset is returned $updateSQL = $conn- >GetUpdateSQL($rs, $record); $conn->Execute($updateSQL); # Update the record in the database $conn->Close(); ?> ----- -------------------------------------------------- -------------------------- Example 8 Implementing Scrolling with Next and Previous The following demonstration is a small paging browsing program. PHP:- -------------------------------------------------- ----------------------------- include_once('../adodb.inc.php'); include_once('.. /adodb-pager.inc.php'); session_start(); $db = NewADOConnection('mysql'); $db->Connect('localhost','root','','xphplens') ; $sql = "select * from adoxyz "; $pager = new ADODB_Pager($db,$sql); $pager->Render($rows_per_page=5);---------- -------------------------------------------------- -------------------- The result of running the above program is as follows: |> >| ID First Name Last Name Date Created 36 Alan Turing Sat 06, Oct 2001 37 Serena Williams Sat 06, Oct 2001 38 Yat Sun Sat 06, Oct 2001 39 Wai Hun See Sat 06 , Oct 2001 40 Steven Oey Sat 06, Oct 2001 Page 8/10 Call the Render($rows) method to display data in pages. If you do not enter a value for Render(), the default value of ADODB_Pager is 10 records per page. You can choose to display any field in SQL and provide Its definition name: $sql = 'select id as "ID", firstname as "First Name", lastname as "Last Name", created as "Date Created" from adoxyz'; You can find the above code in adodb/tests /testpaging.php, the ADODB_Pager object is in adodb/adodb-pager.inc.php. You can add images and change colors to the ADODB_Pager code. You can display HTML code by setting $pager->htmlSpecialChars = false . Some of the code used here was contributed by Iván Oliva and Cornel G. Example 9: Exporting in CSV or Tab-Delimited Format We provide some helper functions to export in comma-separated-value (CSV) and tab-delimited formats: PHP:-------------------------------------------------------------------------------- include_once('/path/to/adodb/toexport.inc.php');include_once('/path/to/adodb/adodb.inc.php'); $db = &NewADOConnection('mysql');$db->Connect($server, $userid, $password, $database);$rs = $db->Execute('select fname as "First Name", surname as "Surname" from table'); print "<pre class="brush:php;toolbar:false">";print rs2csv($rs); # return a string, CSV formatprint '<hr>'; $rs->MoveFirst(); # note, some databases do not support MoveFirstprint rs2tab($rs,false); # return a string, tab-delimited # false == suppress field names in first lineprint '<hr>';$rs->MoveFirst();rs2tabout($rs); # send to stdout directly (there is also an rs2csvout function) print "</pre>"; $rs->MoveFirst();$fp = fopen($path, "w"); if ($fp) { rs2csvfile($rs, $fp); # write to file (there is also an rs2tabfile function) fclose($fp);}-------------------------------------------------------------------------------- Carriage-returns or newlines are converted to spaces. Field names are returned in the first line of text. Strings containing the delimiter character are quoted with double-quotes. Double-quotes are double-quoted again. This conforms to Excel import and export guide-lines. All the above functions take as an optional last parameter, $addtitles which defaults to true. When set to false field names in the first line are suppressed. Example 10: Recordset Filters Sometimes we want to pre-process all rows in a recordset before we use it. For example, we want to ucwords all text in recordset. PHP:-------------------------------------------------------------------------------- include_once('adodb/rsfilter.inc.php'); include_once('adodb/adodb.inc.php'); // ucwords() every element in the recordset function do_ucwords(&$arr,$rs) { foreach($arr as $k => $v) { $arr[$k] = ucwords($v); } } $db = NewADOConnection('mysql'); $db->PConnect('server','user','pwd','db'); $rs = $db->Execute('select ... from table'); $rs = RSFilter($rs,'do_ucwords');-------------------------------------------------------------------------------- The RSFilter function takes 2 parameters, the recordset, and the name of the filter function. It returns the processed recordset scrolled to the first record. The filter function takes two parameters, the current row as an array, and the recordset object. For future compatibility, you should not use the original recordset object. 以上就介绍了dob Adodb的十个实例清晰版，包括了dob方面的内容，希望对PHP教程有兴趣的朋友有所帮助。 </option></select>

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