ezSQL PHP database operation class library_PHP tutorial

ezSQL download address:
Download: ezSQL

The new version is 2.05, which adds a lot of support, including CodeIgniter, MSSQL, PDO, etc.
I have also written for CodeIgniter once before, but it only supports MySQL

Look at the usage examples
In fact, it is not difficult, just look at the source code. The main reason is that the programming idea is very good.

Example 1
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// Select multiple records from the database and print them out..
$users = $db->get_results("SELECT name, email FROM users");
foreach ( $users as $user ) {
// Access data using object syntax
echo $user->name;
echo $user->email;
}
Example 2
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// Get one row from the database and print it out..
$user = $db->get_row("SELECT name ,email FROM users WHERE id = 2");
echo $user->name;
echo $user->email;
Example 3
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/ / Get one variable from the database and print it out..
$var = $db->get_var("SELECT count(*) FROM users");
echo $var;
Example 4
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// Insert into the database
$db->query("INSERT INTO users (id, name, email) VALUES (NULL,'justin','jv@foo. com')");
Example 5
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// Update the database
$db->query("UPDATE users SET name = 'Justin' WHERE id = 2 )");
Example 6
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// Display last query and all associated results
$db->debug();
Example 7
- -------------------------------------------------- -

// Display the structure and contents of any result(s) .. or any variable
$results = $db->get_results("SELECT name, email FROM users");
$db->vardump($results);
Example 8
-------------------------------- -----------------------

// Get 'one column' (based on column index) and print it out..
$names = $db->get_col("SELECT name,email FROM users",0)
foreach ( $names as $name ) {
echo $name;
}
Example 9
------------------------------------------------ ----

// Same as above 'but quicker'
foreach ( $db->get_col("SELECT name,email FROM users",0) as $name ) {
echo $name;
}
Example 10
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// Map out the full schema of any given database and print it out..
$db->select ("my_database");
foreach ( $db->get_col("SHOW TABLES",0) as $table_name ) {
$db->debug();
$db-> get_results("DESC $table_name");
}
$db->debug();

EZSQL class introduction:

ezsql is a small and fast database operation Class allows you to easily operate various databases (MySQL, oracle8/9, interbase, FireBird, PostgreSQL, MS-SQL, sqlite, sqlite C++) with PHP.
Include a PHP file at the beginning of your script. You can then use a smaller, easier set of ezsql functions in place of the standard PHP database functions.
It automatically caches query results, provides a series of simple function operations and extensions, and does not cause additional server overhead
It has excellent debugging functions, allowing you to quickly judge the execution process of SQL statements
The results returned by ezsql functions are objects, associative arrays, or numeric arrays
It can greatly shorten development time, and in most cases, will simplify your code, making it run faster, as well as easily Debug and optimize your database queries.
This is a small category that doesn’t add a lot of overhead to your website.The

class has the following methods:
- $db->get_results – Read the data set from the database (or previously cached data set)
- $db->get_row — Read a piece of data from the database (or previously cached data)
- $db->get_col – Read a column of specified data set from the database (or previously cached data set)
- $db-> ;get_var — Read a value from the database data set (or previously cached data)
- $db->query — Execute a sql statement (if there is data, cache it)
- $db-> ;debug – Print the last executed SQL statement and the returned result (if there is a result)
- $db->vardump – Print the structure and content of the variable
- $db->select — Select a new database
- $db->get_col_info – Get column information
- $db->donation – Donate money to the author
- $db->escape – Format strings inserted into the database , eg: mysql_escape_string(stripslashes($str))
- $db->flush – clear cache
- $db->get_cache – exchange for cache
- $db->hide_errors – hide errors
- $db->register_error – Register errors
- $db->show_errors – Show errors
- $db->store_cache – Store to cache
- $db->sysdate – Get system time
- $db = new db — Create a new db object.

wordpress has modified ezsql, and also made it only applicable to mysql

wordpress modified Some types of operations are functions as follows:

function query($query)
This function is the most basic function of WPDB. $query is an SQL statement, which is submitted to the database for query. The results are divided into two situations:
1. If it is "insert|delete|update|replace", return the number of affected rows. In the case of "insert|replace", use $this->insert_id to record the newly inserted ID.
2. If it is "select", use $this->last_result to record the query result set and return the number of rows of records found.

function escape($string)
Use backslashes to quote strings, that is, use magic quotes.

function insert($table, $data)
This is the insert record function. The first parameter is the field array of the table, and the second is the data array. Returns 1 when inserting data, 0 otherwise.

function update($table, $data, $where)
This is the update record function. The first parameter is the field array of the table, the second is the data array, and the third is the condition array. , it is a nane array. It is 1 if updated, 0 otherwise.

function get_var($query=null, $x = 0, $y = 0)
If $query is not empty, first execute the query and then return the value of column X and row Y.

function get_row($query = null, $output = OBJECT, $y = 0)
Returns a row, $outpu specifies the return type, which can be ARRAY_A, ARRAY_N or OBJECT. $y specifies the row number.

function get_col($query = null, $x = 0)
Returns a column, $x specifies which column.

function get_results($query = null, $output = OBJECT)
Returns the query result set, which can be returned in three ways: ARRAY_A, ARRAY_N or OBJECT.

function get_col_info($info_type = ‘name’, $col_offset = -1)
Return field information.

There are some other functions, which I won’t go into details here. There are also two global variables, SAVEQUERIES and WP_DEBUG. The first one allows you to save the queries executed by the accessed page into the $this->queries array for later use in debugging. WP_DEBUG allows you to save the queries executed by the visited page. Error output. Both of these are not turned on by default. You can turn them on in wp_config.php when testing.