php pdo encapsulation class implements mysql data addition, deletion, checking and modification

define('DSN', 'mysql:host=127.0.0.1;dbname=baozhong_tour'); //Constant of database address + database name
define('DB_USERNAME ', 'root'); //Database username
define('DB_USERPWD', ''); //Database password
?>

/**
* @author shuimugan
* @version 0.2
* @return PDOStatement
*/
function getConn() {
try {
$db = new PDO(DSN, DB_USERNAME, DB_USERPWD); //Create a pdo object and pass in the database parameter information
$db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); // Set database error information
$db->query('set names utf8;'); //Set encoding to utf8
return $db;
}
catch (PDOException $e) {
echo 'Data processing error, please contact Website administrator!';
print_r($e);//Super detailed error message, this sentence must be commented after going online!
return false;
}
}
/**
* @author shuimugan
* @version 0.2
* @param String $tablename table name, type is string
* @param Array $column_name column name, the format of the array is required
* @param String $condition condition, such as 'where name=? and pws=?' or 'name like?'
* @param Array $condition_value The data corresponding to the condition, the type is required to be an array, such as 'name=? and pws=?',
* @return Array returns an Result set array format
* @example $column_name=array('*');
$condition_value=array('1');
$limit='limit 0,10';
$res=easy_select('user', $column_name, 'where id=? ', $condition_value,$limit);
*/
function easy_select( $tablename,$column_name,$condition,$condition_value,$limit) {
try {
$db=getConn();
$sql='select ';//Initialize sql statement
foreach ($column_name as $col_name) {
//Dynamicly append column names into sql statements
if($col_name=='*'){
$sql.='*';
break;
}
if($col_name==end($column_name))
 {
$sql.=$col_name." ";//If it is the last one, the statement does not splice comma
}else {
$sql.=$col_name.", ";//Splice column name + comma
}
}
$sql.="from ".$tablename." ";//Splicing table name
$sql.=$condition.' ';//Splicing conditional statement
if(strlen($limit)>0){
 $sql.=$limit;//Splice the limit statement
}
$db = new PDO(DSN, DB_USERNAME, DB_USERPWD);//Create a pdo object and pass in the database parameter information
$db->setAttribute(PDO:: ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);//Set database error information
$db->query('set names utf8;');//Set encoding to utf8
$stmt = $db->prepare($sql) ;
$i=1;//Start counting, calculate the number of?
$j=count($condition_value);
for (; $i $stmt->bindParam($i , $condition_value[$i-1]);//Bind parameters
$i++;
}
//Query
$stmt->setFetchMode(PDO::FETCH_ASSOC);//Set to get data through fields
$stmt ->execute();
//Get data
return $stmt->fetchAll();
//return $stmt->rowCount();
} catch (PDOException $e) {
return false;
 echo 'Data processing error, please contact the website administrator!';
print_r($e);//Super detailed error message, this sentence must be commented after going online!
}
}
/**
* @author shuimugan
* @version 0.2
* @param String $tablename table name, type is string
* @param Array $column_name column name, the format of the array is required
* @param String $condition condition, such as 'where name=? and pws=?' or 'name like?'
* @param Array $condition_value The data corresponding to the condition, the type is required to be an array, such as 'name=? and pws=?',
* @return int returns the record Number of items
* @example $column_name=array('*');
$condition_value=array('1');
$limit='limit 0,10';
$res=easy_selectCount('user', $column_name , 'where id=? ', $condition_value,$limit);
*/
function easy_selectCount($tablename,$column_name,$condition,$condition_value,$limit) {
try {
$db=getConn();
$sql='select ';//Initialize sql statement
foreach ($column_name as $col_name) {
//Dynamicly append column names into sql statements
if($col_name=='*'){
$sql.='*';
break;
}
if($col_name==end($ column_name))
{
$sql.=$col_name." ";//If it belongs to the last one, the statement does not splice the comma
}else {
$sql.=$col_name.", ";//Splice the column name + comma
}
}
$sql.="from ".$tablename." ";//Splicing table name
$sql.=$condition.' ';//Splicing conditional statement
if(strlen($limit)> 0){
$sql.=$limit;//Splicing limit statement
}
;
$db = new PDO(DSN, DB_USERNAME, DB_USERPWD);//Create a pdo object and pass in the database parameter information
$db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);//Set the database Error message
$db->query('set names utf8;');//Set encoding to utf8
$stmt = $db->prepare($sql);
$i=1;//Start counting, Calculate the number of
$j=count($condition_value);
for (; $i $stmt->bindParam($i, $condition_value[$i-1]);/ / Bind parameters
$i++;
}
// Query
//$stmt->setFetchMode(PDO::FETCH_ASSOC);//Set to get data through fields
$stmt->execute();
// Get data
return $stmt->rowCount();
} catch (PDOException $e) {
return false;
echo 'Data processing error, please contact the website administrator!';
print_r($e);// Super detailed error message, you must comment this sentence after going online!
}
}
/**
* @author shuimugan
* @version 0.2
* @param String $tablename table name, type is string
* @param Array $column_name column name, the format of the array is required
* @param Array $column_value corresponding data, requirements The format of the array
* @return int returns the last incremented id
* @example $column_name=array('pwd','ip','name');
$column_value=array('1246','11.11.11.11 ','Zhang San');
echo easy_insert('user',$column_name,$column_value);
*/
function easy_insert($tablename,$column_name,$column_value) {
try {
$db=getConn( );
$sql='INSERT INTO ';//Initialize sql statement
$sql.=$tablename.' (';//Splice table name
foreach ($column_name as $col_name) {
//Dynamicly append column name Enter the sql statement
if($col_name==end($column_name))
{
$sql.=$col_name." )";//If it is the last one, splice the right bracket
}else {
$sql.=$ col_name.", ";//Splicing column name + comma
}
}
$sql.=' VALUES (';//Splicing $condition_value statement
for ($i=0; $i if ($i==count($column_name)-1) {
$sql.='?) ;';
}else {
$sql.='?,' ;
}
}
$db = new PDO(DSN, DB_USERNAME, DB_USERPWD);//Create a pdo object and pass in the database parameter information
$db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);/ /Set database error information
$db->query('set names utf8;');//Set encoding to utf8
$stmt = $db->prepare($sql);
for ($i=1; $i $stmt->bindParam($i, $column_value[$i-1]);
}
// Query
// echo $sql;
$stmt->setFetchMode(PDO::FETCH_ASSOC);//Set to get data through fields
$stmt->execute();
//Get data
return $db->lastInsertId() ;
} catch (PDOException $e) {
return false;
echo 'Data processing error, please contact the website administrator!';
print_r($e);//Super detailed error message, this sentence must be commented after going online Words!
}
}
/**
* @author shuimugan
* @version 0.2
* @param String $tablename table name, type is string
* @param Array $column_name column name, the format of the array is required
* @param Array $column_value corresponding data, requirements The format of the array
* @param String $condition corresponds to the where statement string such as 'where id=?'
* @param Array $condition_value corresponds to where The data type of the question mark behind is required to be an array
* @return int Returns the affected data Number of rows
* @example $column_name=array('pwd','ip','name');
$column_value=array('123456','127.152.123.132','Zhang San');
$condition_value= array('1');
easy_update('user',$column_name,$column_value,'where id=?',$condition_value,null);
*/
function easy_update($tablename,$column_name,$column_value,$condition,$condition_value,$limit) {
try {
$db=getConn();
 $sql='UPDATE ';//Initialize the sql statement
$sql.=$tablename.' SET ';//Splice the table name
foreach ($column_name as $col_name) {
//Dynamicly append the column name into the sql statement
 if($col_name==end($column_name))
{
$sql.=$col_name." = ? ";//If it belongs to the last
}else {
$sql.=$col_name." = ?, " ;//Splicing column name + comma
}
}
$sql.=$condition;//Splicing conditional statement
if(strlen($limit)>0){
$sql.=$limit;//Splicing limit Statement
}
$db = new PDO(DSN, DB_USERNAME, DB_USERPWD);//Create a pdo object and pass in the database parameter information
$db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);//Set Database error message
$db->query('set names utf8;');//Set encoding to utf8
$stmt = $db->prepare($sql);//Prepare statement
$i=1;
$total=count($column_name)+count($condition_value);
for (;$i $stmt->bindParam($i, $column_value[$i- 1]);//Bind the data parameter corresponding to the column name
$i++;
}
$j=1;
for (;$i $stmt->bindParam($i, $condition_value[$j-1]);//The data parameters corresponding to the binding conditions
$i++;
$j++;
}
//Query
$stmt->setFetchMode(PDO::FETCH_ASSOC);//Set to get data through fields
$stmt->execute();
//Get data
return $stmt->rowCount() ;
} catch (PDOException $e) {
return false;
echo 'Data processing error, please contact the website administrator!';
print_r($e);//Super detailed error message, this sentence must be commented after going online Words!
}
}
/**
* @author shuimugan
* @version 0.2
* @param String $tablename table name
* @param String $condition conditions such as 'where id= ?'
* @param Array $condition_value The value corresponding to the condition is the value corresponding to ?
* @param String $limit limit statement such as 'limit 0,1'
* @return int Returns the number of affected results
* @example $condition_value=array('83');
echo easy_delete('user', 'where id =?', $condition_value, null);
*/
function easy_delete($tablename,$condition,$condition_value,$limit) {
try {
$db=getConn();
$sql='DELETE FROM ';//Initialize sql statement
$sql.=$tablename.' ';//Splice table name
$sql.=$condition;//Splice conditional statement
if(strlen($limit)>0){
 $sql.=$limit;//Splice the limit statement
}
$db = new PDO(DSN, DB_USERNAME, DB_USERPWD);//Create a pdo object and pass in the database parameter information
$db->setAttribute(PDO:: ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);//Set database error information
$db->query('set names utf8;');//Set encoding to utf8
$stmt = $db->prepare($sql) ;//Prepare statement
for ($i=1;$i $stmt->bindParam($i, $condition_value[$i-1]);//Bind Data parameters corresponding to certain conditions
$i++;
}
// Query
$stmt->setFetchMode(PDO::FETCH_ASSOC);//Set to obtain data through fields
$stmt->execute();
// Get Data
return $stmt->rowCount();
} catch (PDOException $e) {
return false;
echo 'Data processing error, please contact the website administrator!';
print_r($e);//Super Detailed error message, you must comment this sentence after going online!
}
}
?>