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PHP Basics - PHP uses PDO
2022-07-28 08:41:00 【Chon.Wang】
# Preface
List some common PDO Usage method . This article requires you to know some basic
MySQL Add, delete, change and check sentencesknowledge .This article does not deal with any security or authentication , Examples only .
One 、PDO The use of the class
1.1 PHP Use PDO Connect MySQL And create data table
You need to submit and prepare a database by yourself , Article database name : by
test_pdodatabase
# This article does not deal with any security or authentication , Only record the function of each command .
$db_name = 'test_pdo';
$mysql_username = 'root'; # MySQL user name
$mysql_password = 'root'; # MySQL User password
$dsn = "mysql:host=127.0.0.1;dbname=$db_name"; # Host name or host IP
$username = 'Chon';
$password = '123456';
$sex = 'Man';
$time = time();
# 1. establish pdo example , Connect MySQL database
$connect_obj = new PDO($dsn, $username, $password);
# Status code and error reason
if ($connect_obj->errorCode()){
die(" Error code : " . $connect_obj->errorCode . ', Error description : ' . $connect_obj->errorInfo());
}
1.2 perform SQL sentence
# New habits 、 modify 、 Use when deleting
# pdo use exec() Method executes a SQL sentence
# Returns the number of affected rows
# Format : object ->exec($sql_string);
# Used to query , It can also be used to newly added 、 modify 、 Delete
# return PDOStatement object , Return if failed FALSE
# pdo use query() Method executes a SQL Query statement
1.3 Create data table
$create_table_sql = "CREATE TABLE `user` ( `id` int(11) NOT NULL AUTO_INCREMENT COMMENT ' User ID', `user_name` varchar(140) NOT NULL DEFAULT '0' COMMENT ' full name ', `password` varchar(120) NOT NULL COMMENT ' The login password ', `sex` varchar(30) DEFAULT NULL COMMENT ' Gender ', `creattime` varchar(40) NOT NULL COMMENT ' Creation time ', `is_del` enum('YES','NO') DEFAULT 'NO', PRIMARY KEY (`id`) ) ENGINE=MyISAM AUTO_INCREMENT=1 DEFAULT CHARSET=utf8 ROW_FORMAT=COMPACT COMMENT=' User table ';";
$create_table_result = $connect_obj->exec($create_table_sql);
1.4 New operation
$insert_sql = "INSERT INTO user (user_name, password, sex, creattime) VALUES ('Leslie','123456','MAN','1658569655')"; # SQL sentence
$insert_result = $connect_obj->exec($insert_sql); # perform SQL sentence
$inseret_id = $connect_obj->lastInsertId(); # Get the autoincrement of newly inserted data ID
1.5 Delete operation
$delete_sql = "DELETE FROM user WHERE id < 5"; # Delete function SQL sentence
$delete_result = $connect_obj->exec($delete_sql); # perform SQL sentence
1.6 Modify the operating
$update_sql = "UPDATE user SET user_name = 'Chon' WHERE id = 6"; # Delete function SQL sentence
$update_result = $connect_obj->exec($update_sql); # perform SQL sentence
1.7 Query operation
# The first one is : Query data - query() Inquire about
# query() The return is PDOStatement object , You need to traverse to get data
$select_all_sql = "SELECT * FROM user where id > 8";
$select_all_result = $connect_obj->query($select_all_sql); # perform SQL sentence
foreach($select_all_result as $val){
# Some data processing
}
Two 、PDOStatement The use of the class
2.1 to 2.3 For preprocessing statements .
2.1 Preparation and execution
# 1. prepare() Prepare to execute SQL sentence , return PDOStatement object
$stmt = $connect_obj->prepare($sql_string);
# 2. execute() Execute the prepared SQL sentence , Return value TRUE | FALSE
$stmt->execute();
2.2 The colon : Placeholders are bound to parameters bindParam() perform
$statement_insert_sql = "INSERT INTO user (user_name, password, sex, creattime) VALUES (:user_name, :password, :sex, :creattime)";
$stmt = $connect_obj->prepare($statement_insert_sql);
# The first way of execution : Pass in an array of parameter values
$result_1 = $stmt->execute([':user_name'=> 'Chon', ':password'=>123456, ':sex'=>'WOMAN', ':creattime'=>time()]);
# The second way of execution : Parameter binding bindParam()
$stmt->bindParam(':user_name', $username);
$stmt->bindParam(':password', $password);
$stmt->bindParam(':sex', $sex);
$stmt->bindParam(':creattime', $time);
$result_2 = $stmt->execute();
2.3 question mark ? Placeholders are bound to parameters bindValue() perform
$statement_insert_sql = "INSERT INTO user (user_name, password, sex, creattime) VALUES (?, ?, ?, ?)";
$stmt = $connect_obj->prepare($statement_insert_sql);
# The first way of execution : In placeholder order , Pass in an array of parameter values
$result_3 = $stmt->execute(['Leslie','123456','MAN','1658569655']);
# The second way of execution : bindValue()
$stmt->bindValue(1, $username);
$stmt->bindValue(2, $password);
$stmt->bindValue(3, $sex);
$stmt->bindValue(4, $time);
$result_4 = $stmt->execute();
2.4 Column binding bindColumn()
# get data
$stmt = $connect_obj->prepare($select_all_sql);
$stmt->execute();
# The first way : Column number binding
$stmt->bindColumn(1, $column_username);
$stmt->bindColumn(2, $column_password);
# The second way ： Column name binding
$stmt->bindColumn('sex', $column_sex);
$stmt->bindColumn('creattime', $column_creattime);
# Example :
while ($row = $stmt->fetch()) {
echo $column_username, $column_password, $column_sex, $column_creattime;
}
2.5 Query operation - Get all the data fetchAll()
# get data
$stmt = $connect_obj->prepare($select_all_sql);
$stmt->execute();
$all_result = $stmt->fetchAll(); # Array
2.6 Query operation - Get single line data
# get data
$stmt = $connect_obj->prepare($select_all_sql);
$stmt->execute();
# 1. Object format
while ($row_obj = $stmt->fetchObject()) {
# Some data processing
}
# 2. The array format
# Common parameters : PDO::FETCH_BOTH( Default ), PDO::FETCH_ASSOC( Associative array ), PDO::FETCH_NUM( The index array )
while ($row_array = $stmt->fetch(PDO::FETCH_ASSOC)) {
# Some data processing
}
2.7 Get the number of rows affected rowCount()
$stmt = $connect_obj->prepare($control_sql);
$stmt->execute();
# This method obtains the last SQL The number of lines affected by the execution of the statement
$stmt->rowCount();
3、 ... and 、 The transaction operations
# Business - First step : Open transaction
$connect_obj->beginTransaction();
# Business - The second step : CUD Wait for the operation
$result = "SQL operation ";
# Business - The third step : Commit transaction or roll back transaction
if ($result){
# If the operation results are correct , Then commit the transaction
$connect_obj->commit();
} else {
# If there is an error, rollback the transaction
$connect_obj->rollback();
}
# Other - Check whether it is within a transaction (bool: true | false)
$is_transaction = $connect_obj->inTransaction();
Four 、 The sample code
<?php
# This article does not deal with any security or authentication , Only record the function of each command .
$db_name = 'test_pdo';
$mysql_username = 'root'; # MySQL user name
$mysql_password = 'root'; # MySQL User password
$dsn = "mysql:host=127.0.0.1;dbname=$db_name"; # Host name or host IP
$username = 'Chon';
$password = '123456';
$sex = 'Man';
$time = time();
# One 、PDO The use of the class
## 1.1 establish pdo example , Connect MySQL database
$connect_obj = new PDO($dsn, $mysql_username, $mysql_password);
# Status code and error reason
if ($connect_obj->errorCode()){
die(" Error code : " . $connect_obj->errorCode . ', Error description : ' . $connect_obj->errorInfo());
}
## 1.2 perform MySQL sentence
# exec() New habits 、 modify 、 Use when deleting
# pdo use exec() Method executes a SQL sentence
# Returns the number of affected rows
# Format : object ->exec($sql_string);
# query() Used to query , It can also be used to newly added 、 modify 、 Delete
# return PDOStatement object , Return if failed FALSE
# pdo use query() Method executes a SQL Query statement
## 1.3 Create data table
/* $create_table_sql = "CREATE TABLE `user` ( `id` int(11) NOT NULL AUTO_INCREMENT COMMENT ' User ID', `user_name` varchar(140) NOT NULL DEFAULT '0' COMMENT ' full name ', `password` varchar(120) NOT NULL COMMENT ' The login password ', `sex` varchar(30) DEFAULT NULL COMMENT ' Gender ', `creattime` varchar(40) NOT NULL COMMENT ' Creation time ', `is_del` enum('YES','NO') DEFAULT 'NO', PRIMARY KEY (`id`) ) ENGINE=MyISAM AUTO_INCREMENT=1 DEFAULT CHARSET=utf8 ROW_FORMAT=COMPACT COMMENT=' User table ';"; $create_table_result = $connect_obj->exec($create_table_sql); */
## 1.4 New operation
# $insert_sql = "INSERT INTO user (user_name, password, sex, creattime) VALUES ('Leslie','123456','MAN','1658569655')"; # SQL sentence
# $insert_result = $connect_obj->exec($insert_sql); # perform SQL sentence
# $inseret_id = $connect_obj->lastInsertId(); # Get the autoincrement of newly inserted data ID
## 1.5 Delete operation
$delete_sql = "DELETE FROM user WHERE id < 5"; # Delete function SQL sentence
$delete_result = $connect_obj->exec($delete_sql); # perform SQL sentence
## 1.6 Modify the operating
$update_sql = "UPDATE user SET user_name = 'Chon' WHERE id = 6"; # Delete function SQL sentence
$update_result = $connect_obj->exec($update_sql); # perform SQL sentence
## 1.7 Query operation
# The first one is : Query data - query() Inquire about
# query() The return is PDOStatement object , You need to traverse to get data
$select_all_sql = "SELECT * FROM user where id > 8";
$select_all_result = $connect_obj->query($select_all_sql); # perform SQL sentence
foreach($select_all_result as $val){
# Some data processing
}
# Two 、 Preprocessing statement
## 2.1 Preparation and execution
# 1. prepare() Prepare to execute SQL sentence
# $stmt = $connect_obj->prepare($sql_string);
# 2. execute() Execute the prepared SQL sentence , Return value TRUE | FALSE
# $stmt->execute();
## 2.2 The colon (:) Placeholders are bound to parameters bindParam() perform
# $statement_insert_sql = "INSERT INTO user (user_name, password, sex, creattime) VALUES (:user_name, :password, :sex, :creattime)";
# $stmt = $connect_obj->prepare($statement_insert_sql);
# The first way of execution : Pass in an array of parameter values
# $result_1 = $stmt->execute([':user_name'=> 'Chon', ':password'=>123456, ':sex'=>'WOMAN', ':creattime'=>time()]);
# The second way of execution : bindParam()
# $stmt->bindParam(':user_name', $username);
# $stmt->bindParam(':password', $password);
# $stmt->bindParam(':sex', $sex);
# $stmt->bindParam(':creattime', $time);
# $result_2 = $stmt->execute();
## 2.3 question mark (?) Placeholders are bound to parameters bindValue() perform
# $statement_insert_sql = "INSERT INTO user (user_name, password, sex, creattime) VALUES (?, ?, ?, ?)";
# $stmt = $connect_obj->prepare($statement_insert_sql);
# The first way of execution : In placeholder order , Pass in an array of parameter values
# $result_3 = $stmt->execute(['Leslie','123456','MAN','1658569655']);
# The second way of execution : bindValue()
# $stmt->bindValue(1, $username);
# $stmt->bindValue(2, $password);
# $stmt->bindValue(3, $sex);
# $stmt->bindValue(4, $time);
# $result_4 = $stmt->execute();
## 2.4 Column binding bindColumn()
# get data
# $stmt = $connect_obj->prepare($select_all_sql);
# $stmt->execute();
# The first way : Column number binding
# $stmt->bindColumn(1, $column_username);
# $stmt->bindColumn(2, $column_password);
# The second way ： Column name binding
# $stmt->bindColumn('sex', $column_sex);
# $stmt->bindColumn('creattime', $column_creattime);
# Example :
#while ($row = $stmt->fetch()) {
# echo $column_username, $column_password, $column_sex, $column_creattime;
#}
# 2.5 Query operation - Get all the data `fetchAll()`
# $stmt = $connect_obj->prepare($select_all_sql);
# $stmt->execute();
# $all_result = $stmt->fetchAll(); # Array
# 2.6 Query operation - Get single line data
$stmt = $connect_obj->prepare($select_all_sql);
$stmt->execute();
# 1. Object format
# while ($row_obj = $stmt->fetchObject()) {
# Some data processing
# }
# 2. The array format
# Common parameters : PDO::FETCH_BOTH( Default ), PDO::FETCH_ASSOC( Associative array ), PDO::FETCH_NUM( The index array )
while ($row_array = $stmt->fetch(PDO::FETCH_ASSOC)) {
# Some data processing
}
# 2.7 Get the number of rows affected
$stmt = $connect_obj->prepare($select_all_sql);
$stmt->execute();
# This method obtains the last SQL The number of lines affected by the execution of the statement
$stmt->rowCount();
# Business - Start
# Business - First step : Open transaction
$connect_obj->beginTransaction();
# Business - The second step : CUD Wait for the operation
$result = "SQL operation ";
# Business - The third step : Commit transaction or roll back transaction
if ($result){
# If the operation results are correct , Then commit the transaction
$connect_obj->commit();
} else {
# If there is an error, rollback the transaction
$connect_obj->rollback();
}
# Other - Check whether it is within a transaction
$is_transaction = $connect_obj->inTransaction();
# Business - end
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