PHP代码
<?php /** * SQL 简单查询工具类 * <code> * $tools = new SQLTools("表名", "数据库操作对象实例"); * $tools->query("字段默认为*") //(如无后续操作此处返回查询结果集) * ->where( '条件', PDO参数化查询参数 ) //(如无后续操作此处返回查询结果集) * ->group( 'id' ) //(如无后续操作此处返回查询结果集) * ->order( 'id', 'desc' ) //(如无后续操作此处返回查询结果集) * ->limit( 0, 100 ) //(如无后续操作此处返回查询结果集) * ->toSQL(); // 返回拼接出来的SQL * * </code> */ defined( 'SQL_TAG_QUERY' ) OR define( 'SQL_TAG_QUERY', 'query' ); defined( 'SQL_TAG_LIMIG' ) OR define( 'SQL_TAG_LIMIT', 'limit' ); defined( 'SQL_TAG_WHERE' ) OR define( 'SQL_TAG_WHERE', 'where' ); defined( 'SQL_TAG_ORDER' ) OR define( 'SQL_TAG_ORDER', 'order' ); defined( 'SQL_TAG_GROUP' ) OR define( 'SQL_TAG_GROUP', 'group' ); // to xx 自己加吧 defined( 'TO_SQL' ) OR define( 'TO_SQL', 'toSQL' ); class SQLTools{ public $id = null; public $db = null; public $tableName = null; private $__code = null; private $__query = null; private $__where = null; private $__param = null; private $__limit = null; private $__order = null; private $__group = null; /** * 实例化 * @param $tableName stirng 表名 * @param $db 一个数据库操作对象,且必须有个叫query的方法,接受两个参数 sql 及 params * @param $id 主键字段名 */ public function __construct( $tableName, $db, $id=null ){ $this->db = $db; $this->id = $id; $this->tableName = $tableName; } public function query( $fields='*', $tableName=null ){ $tableName === null && ( $tableName = $this->tableName ); $this->__query = "SELECT $fields FROM $tableName "; return $this->__setResultByCallCode( SQL_TAG_QUERY ); } public function where( $where, $params ){ $this->__where = "WHERE $where "; $this->__param = $params; return $this->__setResultByCallCode( SQL_TAG_WHERE ); } public function order( $fields, $sort ){ $this->__order = "ORDER BY $fields $sort "; return $this->__setResultByCallCode( SQL_TAG_ORDER ); } public function group( $fields ){ $this->__group = "GROUP BY $fields"; return $this->__setResultByCallCode( SQL_TAG_GROUP ); } public function limit( $m, $n ){ $this->__limit = sprintf( 'LIMIT %d,%s ', $m, $n ); return $this->__setResultByCallCode( SQL_TAG_LIMIT ); } public function toSQL(){ return $this->__setResultByCallCode( TO_SQL ); } public function clear(){ $this->__code = null; $this->__query = null; $this->__where = null; $this->__param = null; $this->__limit = null; $this->__order = null; $this->__group = null; } // 真正查询的地方 private function __query( $tag ){ $__sql = $this->__query; $this->__where !== null && ( $__sql .= $this->__where ); $this->__group !== null && ( $__sql .= $this->__group ); $this->__order !== null && ( $__sql .= $this->__order ); $this->__limit !== null && ( $__sql .= $this->__limit ); $result = $tag === TO_SQL ? $__sql : $this->db->query( $__sql, $this->__param ); $this->clear(); return $result; } /** * 通过堆栈信息获取调用脚本后面调用方法, * 根据方法生成相关返回对象 * @param $tag sql标签 * @return object **/ private function __setResultByCallCode( $tag ){ if( $this->__code !== null ){ return $this->__createResult( $this->__code, $tag ); } $info = debug_backtrace(); if( !is_array($info) ){ return null; } // 找到调用文件索引 ( 这里是通过文件名匹配的,如果改了文件名请自行修改这段代码 ) $index = -1; foreach( $info as $counter => $item ){ if( isset($item['file']) ){ if( stripos($item['file'], 'SQLTools.class.php') > 0 ){ $index = $counter + 1; // 下一个item即调用文件 break; } } } // 没有找到调用信息 if( $index === -1 ){ return null; } // 堆栈中没有找到相关信息 $caller = $info[$index]; if( !isset($caller['file']) || !file_exists($caller['file']) || !isset($caller['line']) ){ return null; } $line = $caller['line']; $file = @fopen( $caller['file'], "r" ); $counter = 1; $code = ''; while( ($buffer = fgets($file)) !== false ){ if( $counter >= $line ){ $code .= $buffer; if( substr( $buffer, -2, 1 ) == ';' ){ goto end; } } $counter++; } end: isset( $file ) && @fclose( $file ); $code = str_replace( ' ', '', $code ); $code = str_replace( "\t", '', $code ); $code = str_replace( "\n", '', $code ); $code = explode( '->', $code ); return $this->__createResult( $code, $tag ); } // 返回$this起到链接作用,又判断当前调用tag是否已经结束 private function __createResult( $code, $tag ){ $this->__code = $code; foreach( $this->__code as $code){ if( stripos($code, $tag) === 0 && substr( $code, -1 ) === ';' ){ // 判断查询结束 return $this->__query( $tag ); } } return $this; } }