数据库查询类（1）
*
* 数据库操作类采用Mysqli进行处理
* 数据库操作分为：
* 查询 支持 fields='id,name' 指定获取的字段
* 查询列表 listInfo() 支持 page size 分页 返回一个列表数组
* 查询详情 detailInfo() 返回一个数组详情
* 修改 支持 fields='id,name' 指定获取的字段
* 添加数据 updateInfo(); 参数没有id视为添加数据
* 修改数据 updateInfo(); 参数有id视为修改数据
*
*/
// 操作实例
/*
// 查询
D(ZDB::model('test')->detailInfo([ 'id' => 3 ,'fields' => 'id,name' ]));
D(ZDB::model('test')->listInfo(['page'=>'1','size'=> '2', 'fields' => '*' ]));
// 修改
D(ZDB::model('test')->updateInfo(['name'=>'12312', 'fields' => '*' ]));
D(ZDB::model('test')->updateInfo(['name'=> time() ,'id'=>'1', 'fields' => 'id,name' ]));
die(' 数据库操作类实例结束 ');
*/
/**
* 数据库操作封装类
*/
class ZDB extends DB
{
/** @var [type] [单例] */
private static $instance;
/** @var [type] [description] */
public $tableName;
/** @var [type] [description] */
private $fields = [];
/** @var [type] [description] */
// private $where;
/**
* [model 加载模型对象]
* @param string $tableName [description]
* @return [type] [description]
*/
public static function model($tableName = '')
{
return static::getModel($tableName);
}
/**
* [getModel 获取单例对象]
* @param string $tableName [description]
* @return [type] [description]
*/
public static function getModel( $tableName = '')
{
if(is_null(self::$instance))
{
}
$argv = array
(
'host' => 'xxxxx',
'user' => 'xxx',
'password' => 'xxx',
'port' => 3306,
'database' => 'xxx',
'charset' => 'utf8'
);
self::$instance = new static($argv);
self::$instance->tableName = $tableName;
self::$instance->getMeta();
// D( self::$instance->tableName );
return self::$instance;
}
/**
* [updateData description]
* @param array $params [description]
* @return [type] [description]
*/
public function updateData( $params = [] )
{
$setStr = '';
foreach ($params as $key => $value)
{
foreach ($this->fields as $field)
{
if ( $field['field'] == $key)
{
$setStr .= "$key='$value', ";
}
}
}
$setStr = rtrim($setStr,', ');
$sql="update {$this->tableName} set {$setStr} WHERE id = {$params['id']}";
$this->query($sql);
$detailInfo = [];
if ( $this->affected_rows > 0 )
{
$detailParams = [ 'id' => $params['id'] ];
empty($params['fields']) OR $detailParams['fields'] = $params['fields'];
$detailInfo = $this->detailInfo($detailParams);
}
return $detailInfo;
}
/**
* [addData description]
* @param array $params [description]
*/
public function addData( $params = [] )
{
//拼接SQL语句
$field_str='';
$value_str='';
foreach ($params as $key => $value)
{
foreach ($this->fields as $field)
{
if ( $field['field'] == $key && $key != 'id' )
{
$field_str .= $this->escape($key).',';
$value_str .= "'" . $this->escape($value) . "',";
}
}
}
//
//去掉最后一个逗号
$field_str= rtrim($field_str,',');
$value_str= rtrim($value_str,',');
//准备执行的SQL语句
$sql="INSERT INTO {$this->tableName} ({$field_str}) VALUES ({$value_str})";
$this->query($sql);
$detailInfo = [];
if ( $this->insert_id > 0 )
{
$detailParams = ['id' => $this->insert_id];
empty($params['fields']) OR $detailParams['fields'] = $params['fields'];
$detailInfo = $this->detailInfo($detailParams);
}
return $detailInfo;
}
/**
* [getFields description]
* @param [type] $fields [description]
* @return [type] [description]
*/
public function getFields( $fields )
{
// $arrField = '*';
$arrField = [];
$arrFields = is_string($fields) ? explode(',',$fields): $fields;
foreach ($arrFields as $fieldName)
{
foreach ($this->fields as $field)
{
if ( $field['field'] == $fieldName )
{
$arrField[] = $fieldName;
}
}
}
return empty($arrField) ? '*' : rtrim(implode(',', $arrField),',') ;
}
/**
* [updateInfo description]
* @param array $params [description]
* @return [type] [description]
*/
public function updateInfo( $params = [] )
{
$detailInfo = [];
if (empty($params['id']))
{
$detailInfo = $this->addData($params);
}
else
{
$params['modifyTime'] = date('Y-m-d H:i:s',time());
$detailInfo = $this->updateData($params);
}
return $detailInfo;
}
/**
* [detailInfo description]
* @param array $params [description]
* @return [type] [description]
*/
public function detailInfo( $params = [] )
{
$detailInfo = [];
if (!empty($params))
{
$params['size'] = 1;
$listInfo = $this->listInfo($params);
empty($listInfo[0]) OR $detailInfo = $listInfo[0];
}
return $detailInfo;
}
/**
* [attributes description]
* @return [type] [description]
*/
public function attributes()
{
$fields = [];
foreach ($this->fields as $key => $value)
{
$fields[$value['field']] = $value['content'];
}
return $fields;
}
/**
* [arrCondition 特殊条件]
* @param array $params [description]
* @return [type] [description]
*/
public function arrCondition($params = [])
{
$attributes = $this->attributes();
$arrCondition = [];
foreach ($params as $key => $value)
{
$arrKey = [];
// startPosition search=古交
$space = ' ';
if ( strpos($key,$space) !== FALSE ) //如果存在空格
{
$arrKey = explode($space, $key);
}
// startPosition_search=古交
else if ( stristr($key,'_search') !== FALSE ) //如果存在空格
{
$arrKey = $arrKey = explode('_', $key);
}
if (count($arrKey) == 2)
{
$arrKey[0] = trim( $arrKey[0] );
if ( array_key_exists( $arrKey[0], $attributes ) && isset($value) )
{
// 'targetType <=' => 2
if( in_array($arrKey[1], ['<','>','>=','<=','=']) )
{
$arrCondition[] = " {$arrKey[0]} {$arrKey[1]} '{$value}' ";
}
// else if( $arrKey[1] === 'in' ) //$params[CRITERIA_KEY::WHERE]['id in'] = $targetID;
// {
// $arrCondition[] = " {$arrKey[0]} {$arrKey[1]} {$value} ";
// }
// else if( $arrKey[1] === 'notin' )
// {
// $arrCondition[] = " {$arrKey[0]} {$arrKey[1]} {$value} ";
// }
else if( $arrKey[1] === 'search' )
{
// sprintf('%s', trim($arrKey[1]);
$arrCondition[] = " {$arrKey[0]} like '%{$value}%' ";
}
}
}
}
return $arrCondition;
}
/**
* [validParams 合法的参数]
* @param array $params [description]
* @return [type] [description]
*/
public function validParams($params = [])
{
$checkParams = [];
if(!empty($params) && is_array($params) )foreach ($params as $key => $value)
{
foreach ($this->fields as $field)
{
if ( $field['field'] == $key )
{
$checkParams[$key] = $value;
}
}
}
return $checkParams;
}
/**
* [arrCriteria 标准的=条件]
* @param array $params [description]
* @return [type] [description]
*/
public function arrCriteria($params = [])
{
!isset($params['status']) && $params['status'] = '1'; // 默认
$arrCriteria = [];
foreach ($params as $key => $value)
{
foreach ($this->fields as $field)
{
if ( $field['field'] == $key )
{
$arrCriteria[] = "{$key} = '" . $this->escape($value) . "'";
}
}
}
return $arrCriteria;
}
/**
* [getWhere description]
* @param array $params [description]
* @return [type] [description]
*/
public function where($params = [])
{
$arrCriteria = $this->arrCriteria($params);
$arrCondition = $this->arrCondition($params);
$arrWhere = array_merge($arrCriteria,$arrCondition);
$condition='';
if(!empty($arrWhere))
{
$condition = ' ' . implode(' and ',$arrWhere);
}
return $condition;
}
/**
* [listInfo description]
* @param array $params [description]
* @return [type] [description]
*/
public function listInfo( $params = [] )
{
$where = $this->where($params);
$where = empty($where) ? '': ' WHERE ' . $where;
$fields = empty($params['fields']) ? '*' : $this->getFields( $params['fields'] );
$page = empty($params['page']) ? 1 : $params['page'] ;
$size = empty($params['size']) ? 10 : $params['size'] ;
$order = empty($params['order']) ? ' id DESC ' : $params['order'] ;
// $size = empty($params['size']) ? 3 : $params['size'] ;
$offset = intval( $page-1 ) * $size ;
$limit = " ORDER BY {$order} LIMIT {$offset}, {$size} ";
if(!empty($params['_count']))
{
$fields = $params['_count'];
$limit = '';
}
$sql = "SELECT {$fields} FROM {$this->defaultDB}.{$this->tableName} {$where} {$limit} ";
$listInfo = $this->find( $sql );
return $listInfo;
}
public function count( $params = [] )
{
$count = 0;
$params['_count'] = 'count(id) as count ';
$params['size'] = '1';
$listInfo = $this->listInfo($params);
empty($listInfo[0]['count']) OR $count = $listInfo[0]['count'];
return $count;
}
//获取字段信息
private function getMeta()
{
$sql = "SELECT column_name as field, column_comment as content FROM Information_schema.columns WHERE table_schema = '{$this->host_info->database}'AND table_Name = '{$this->tableName}'; ";
$findList = $this->find($sql);
// D($sql);
// D($findList);
// D($this);
$this->fields = $findList;
// D( $this->fields );
}
}
class DB {
protected $defaultDB = null;
protected $link = null;
protected $sql = null;
protected $host_info = null;
protected $bindValue = null;
public $num_rows = 0;
public $affected_rows = 0;
public $insert_id = 0;
public $queries = 0;
protected function __construct() {
if(func_num_args()) {
$argv = func_get_arg(0);
if(!empty($argv) && is_array($argv)) {
$this->connect($argv);
$argv['charset'] = isset($argv['charset']) ? $argv['charset'] : 'utf8';
$this->setCharset($argv['charset']);
}
}
}
public static $mysqli_connect = null;
public function connect($argv, $charset = null) {
if($this->link) return false;
$argv = func_get_arg(0);
$argv['port'] = isset($argv['port']) ? $argv['port'] : 3306;
if(is_null(self::$mysqli_connect))
{
// D(12);
}
self::$mysqli_connect = mysqli_connect( $argv['host'], $argv['user'], $argv['password'], $argv['database'], $argv['port']);
$this->link = self::$mysqli_connect;
if(mysqli_connect_errno()) {
echo mysqli_connect_error();
exit(0);
}
$this->defaultDB = $argv['database'];
$this->selectDB($this->defaultDB);
$this->host_info = (object) $argv;
if($charset) $this->setCharset($charset);
}
public function selectDB($database){
$int = mysqli_select_db($this->link, $database);
if($int) $this->defaultDB = $database;
return $int;
}
public function query($sql) {
// DD($this->link);
// D($sql);
$result = mysqli_query($this->link, $sql);
if(mysqli_errno($this->link)) {
echo mysqli_error($this->link);
exit(0);
}
$this->queries++;
if(preg_match('/^use\s+(\w+)/', $sql, $matches))
list($range, $this->defaultDB) = $matches;
if(!preg_match('/^select(.+)$/i', $sql)) {
$this->affected_rows = mysqli_affected_rows($this->link);
}else{
$this->num_rows = mysqli_num_rows($result);
}
if(preg_match('/^insert(.+)$/i', $sql))
$this->insert_id = mysqli_insert_id($this->link);
return $result;
}
private $sqlLog;
public function find($sql) {
$this->sqlLog[] = $sql;
// D( $this->sqlLog );
$collection = array();
$result = $this->query($sql);
while($rows = mysqli_fetch_assoc($result))
array_push($collection, $rows);
mysqli_free_result($result);
return $collection;
}
public function getSqlLog() {
return $this->sqlLog;
}
public function setCharset($charset) {
return mysqli_set_charset($this->link, $charset);
}
/*
public function prepare($sql) {
$this->sql = $sql;
}
public function bindValue($search, $value) {
$this->bindValue = array();
$this->bindValue[$search] = $value;
}
public function execute() {
if(func_num_args()) {
$argv = func_get_arg(0);
if(!empty($argv) && is_array($argv)) {
if(!is_array($this->bindValue)) $this->bindValue = array();
$this->bindValue = array_merge($this->bindValue, $argv);
}
}
if($this->bindValue) {
foreach($this->bindValue as $search => $value) {
$this->sql = str_replace($search, $this->escape($value), $this->sql);
}
$this->bindValue = null;
}
$int = $this->query($this->sql);
//$this->sql = null;
return (boolean) $int;
}*/
/** [escape description] */
public function escape($string)
{
return mysqli_real_escape_string($this->link, $string);
}
/** [close description] */
public function close() {
return mysqli_close($this->link);
}
/** [ping description] */
public function ping() {
return mysqli_ping($this->link);
}
/** [beginTransaction description] */
public function beginTransaction($boolean) {
return mysqli_autocommit($this->link, $boolean);
}
public function commit() {
return mysqli_commit($this->link);
}
public function rollback() {
return mysqli_rollback($this->link);
}
public function __destruct() {
if($this->link) $this->close();
unset($this->link, $this->defaultDB, $this->bindValue, $this->sql, $this->result, $this->num_rows, $this->affected_rows, $this->insert_id, $this->host_info);
}
}
数据库查询类（2）
'; print_r( func_get_args() ); echo '"; } // 单例设计模式，只连接一次数据库 class DBConnect { private static $_instance = null; //私有构造函数，防止外界实例化对象 // private function __construct() {} //私有克隆函数，防止外办克隆对象 // private function __clone() {} //静态方法，单例统一访问入口 public static function getInstance() { if(is_null(self::$_instance)) { // D('tableName'); self::$_instance = mysqli_connect( DB_HOST, DB_USER, DB_PASSWORD, DB_DATABASE, DB_PORT ); } return self::$_instance; } } class DBModel { // 成员属性 private $sqlCache; private $tableName; private $connect; private $tableColumn; // 初始化对象 public function __construct( $tableName = '') { // 连接数据库 $this->tableName = $tableName; $this->connect = DBConnect::getInstance(); mysqli_set_charset($this->connect, CHARSET); $this->tableColumn = $this->getTableColumn($this->tableName); $this->sqlCache = []; } // 获取列表 public function getList($params = []) { $listInfo = []; // 默认查询列表 $sql = " SELECT * FROM {$this->tableName} "; $sql .= $this->getWhere($params); $order = empty($params['order']) ? ' id desc ' : $params['order']; $sql .= " ORDER BY {$order} "; // 分页参数 $page = empty($params['page']) ? 1 : $params['page']; $size = empty($params['size']) ? 10 : $params['size']; // 当前页码 - 1 乘以 显示的条数 例：limit 0,5 $page = ($page - 1) * $size; $sql .= " limit {$page},$size "; if(isset($this->sqlCache[$sql])) { $listInfo = $this->sqlCache[$sql]; } else { $result = $this->mysqliQuery($sql); // 查看贴子列表 $listInfo = array(); while($rows = mysqli_fetch_assoc($result)) { $listInfo[] = $rows; } $this->sqlCache[$sql] = $listInfo; } // D($this->sqlCache); return $listInfo; } // 获取详情 public function getDetail($params = []) { $getDetail = []; $list = $this->getList($params); if(!empty($list[0])) { $getDetail = $list[0]; } return $getDetail; } // 修改数据 params 必须包含ID public function update($params = []) { $detail = []; $column = $this->getColumn($params); if(!empty($column['id'])) { // UPDATE `demo`.`user` SET `name`='33', `age`='22' WHERE `id`='6'; $sql = " UPDATE {$this->tableName} SET "; $field = ''; foreach ($column as $key => $value) { $field .= " `{$key}` = '{$value}',"; } $field = trim($field, ','); $sql .= $field; $sql .= " WHERE id = {$column['id']} "; $result = $this->mysqliQuery($sql); $rows = mysqli_affected_rows($this->connect); // var_dump($rows); if(!empty($rows)) { $detail = $this->getDetail(['id' => $column['id'] ]); } } return $detail; } // 添加数据 public function addInfo($params = []) { $detail = []; $column = $this->getColumn($params); $sql = " INSERT INTO {$this->tableName} "; // INSERT INTO `demo`.`user` (`name`, `age`) VALUES ('1', '2'); $keys = ''; $values = ''; foreach ($column as $key => $value) { $keys .= "`{$key}`,"; $values .= "'{$value}',"; } $keys = trim($keys, ','); $values = trim($values, ','); $sql.= " ($keys) "; $sql.= ' VALUES '; $sql.= " ($values) "; // 执行添加 $result = $this->mysqliQuery($sql); // D($column); // D($keys); // D($values); // D($sql); // var_dump($result); if( $result=== true ) { $insertID = mysqli_insert_id($this->connect); $detail = $this->getDetail(['id' => $insertID]); } return $detail; } // 删除数据 params 必须有ID public function delete($params = []) { $rows = 0; if(!empty($params['id'])) { $sql = " DELETE FROM {$this->tableName} WHERE `id`='{$params['id']}' "; $result = $this->mysqliQuery($sql); $rows = mysqli_affected_rows($this->connect); } return $rows; } // 查询数据 public function mysqliQuery( $sql = '' ) { D($sql); $result = mysqli_query($this->connect, $sql); return $result; } // 组装有效的where public function getWhere( $params = [] ) { $strWhere = []; $column = $this->getColumn($params); foreach ($column as $key => $value) { $strWhere[] = " {$key} = '{$value}' "; } $strWhere = implode(' AND ', $strWhere); foreach ($params as $key => $value) { if(is_int($key)) { $strWhere .= $value; } } if(!empty($strWhere)) { $strWhere = " WHERE {$strWhere} "; } // D($params); // D($column); return $strWhere; } // 获取表的列字段 public function getTableColumn($tableName = '') { $listTableColumn = []; $sql = " desc {$tableName}"; $result = $this->mysqliQuery($sql); // 查看贴子列表 $tableColumn = array(); while($rows = mysqli_fetch_assoc($result)) { $tableColumn[$rows['Field']] = $rows; } return $tableColumn; } // 获取参数的有效字段 public function getColumn( $params = [] ) { $column = []; foreach ($params as $key => $value) { if(isset($this->tableColumn[$key])) { $column[$key] = $value; } } return $column; } } // 实例化对象 // $userModel = new DBModel('user'); // 参数 // $params = []; // 等值查询 // $params['id'] = '5'; // 特殊查询 // $params[] = ' name like "%c%" '; // 无效字段 // $params['xxxx'] = '213'; // 获取列表 // $userList = $userModel->getList($params); // D($userList); // 获取详情 // $detail = $userModel->getDetail($params); // $detail = $userModel->getDetail($params); // $detail = $userModel->getDetail($params); // D($detail); // D($userModel); // 添加数据 // $addInfo = []; // 添加的参数 // $addInfo['name'] = 'opp'; // $addInfo['age'] = '2'; // $addInfo['username'] = 'opp'; // $addInfo['avatar'] = 'opp'; // $addInfo = $userModel->addInfo($addInfo); // D($addInfo); // $update = []; // $update['id'] = 6; // $update['name'] = '12312'; // $update = $userModel->update($update); // D($update); /*$delete = []; $delete['id'] = 10; $delete = $userModel->delete($delete); var_dump($delete);*/ // 单例测试 $userModel = new DBModel('user'); $params = []; $params['page'] = 2; // $params['order'] = ' age desc '; $params['size'] = 5; $list = $userModel->getList($params); D($list);
__以上两例代码是业余时间写的，，有些许不完美的情况有待各位读者尽力完善
适合初学者和想熟悉其它框架数据库的同学。
以上代码修改下数据库配置信息，可以很方便的使用去一些小功能哦
感觉不错的，记得给个喜欢哦 ：） __