106. 数据库增删改的封装

<?php

// insert into 表名() values(数据1，数据2,...);
/*function insert($table,$data)
{
    $cols = array();
    $vals = array();

    foreach($data as $k=>$v){
        $cols[] = $k;
        $vals[] = $v;
    }

    var_dump($cols);
    var_dump($vals);die;
    //表名()
    $tableValue = implode(',',$cols);
    //数据
    $dataValue = implode(',',$vals);

    $sql = "insert into $table($tableValue) values($dataValue);";
    return $sql;
}

$table = 'test';
$data = array(
    'id'=>1,
    'content'=>'hello'
);

$sql = insert($table,$data);
var_dump($sql);*/


// update 表名 set 键=值 where ..
/*function update($table,$set,$where=null)
{
    $cols = array();
    $vals = array();
    $data = array();
    foreach($set as $k=>$v){
        $data[] = "$k=$v";
    }
    $data = implode(',',$data);
    $sql = "update $table set $data where $where;";
    var_dump($sql);die;
}

$set = array(
    'id'=>1,
    'content'=>'werwr'
);
$sql = "update test set id='11' content='hwewe100'";
$table = 'test';
$where = 'id = 1';

$sql = update($table,$set,$where);*/

//delete from 表名 where 条件
/*function delete($table,$where)
{
    $sql = "delete from $table where $where;";
    var_dump($sql);die;
    return $sql;
}

$table = 'test';
$where = 'id = 1';
delete($table,$where);*/