如何在PHP中使用mysqli_multi_query一个接一个执行两个SQL查询

Question

我试图使用mysqli_multi_query同时向MySQL数据库中插入值，但是它没有执行，并且如果显示警告消息的部分表明“记录插入失败”，它将无法执行。

以下是我的带有查询的PHP代码

while (($emapData = fgetcsv($file, 10000, ",")) !== FALSE) {
    $sql_tableone =  "INSERT into inverterlog (`id`,`timestamp`,`irradiance`,`ambienttemp`,`photovoltaictemp`,`pv1voltage`,`pv2voltage`,`pv3voltage`,`pv1current`,`pv2current`,`pv3current`,`pv1power`,`pv2power`,`pv3power`,`pv1energy`,`pv2energy`,`pv3energy`,`gridvoltagegv1`,`gridvoltagegv2`,`gridvoltagegv3`,`gridcurrentgc1`,`gridcurrentgc2`,`gridcurrentgc3`,`gridpowergp1`,`gridpowergp2`,`gridpowergp3`,`sumofapparentpower`,`gridpowertotal`,`gridenergyge1`,`gridenergyge2`,`gridenergyge3`,`socounter`,`gridcurrentdcgc1`,`gridcurrentdcgc2`,`gridcurrentdcgc3`,`gridresidualcurrent`,`gridfrequencymean`,`dcbusupper`,`dcbuslower`,`temppower`,`tempaux`,`tempctrl`,`temppower1`,`temppowerboost`,`apparentpowerap1`,`apparentpowerap2`,`apparentpowerap3`,`sovalue`,`reactivepowerrp1`,`reactivepowerrp2`,`reactivepowerrp3`,`opmode`,`latestevent`,`pla`,`reactivepowermode`,`overexcitedunderexcited`,`reactivepowerabs`,`inverter`)
                                                          values('','$newDate','$emapData[1]','$emapData[2]','$emapData[3]','$emapData[4]','$emapData[5]','$emapData[6]','$emapData[7]','$emapData[8]','$emapData[9]','$emapData[10]','$emapData[11]','$emapData[12]','$emapData[13]','$emapData[14]','$emapData[15]','$emapData[16]','$emapData[17]','$emapData[18]','$emapData[19]','$emapData[20]','$emapData[21]','$emapData[22]','$emapData[23]','$emapData[24]','$emapData[25]','$emapData[26]','$emapData[27]','$emapData[28]','$emapData[29]','$emapData[30]','$emapData[31]','$emapData[32]','$emapData[33]','$emapData[34]','$emapData[35]','$emapData[36]','$emapData[37]','$emapData[38]','$emapData[39]','$emapData[40]','$emapData[41]','$emapData[42]','$emapData[43]','$emapData[44]','$emapData[45]','$emapData[46]','$emapData[47]','$emapData[48]','$emapData[49]','$emapData[50]','$emapData[51]','$emapData[52]','$emapData[53]','$emapData[54]','$emapData[55]','$inverter')";
    $sql_tabletwo = "INSERT into data (`id`,`timestamp`,`gridpowertotal`,`inverter`) values ('','$newDate','$emapData[26]','$inverter')";
    $sql= $sql_tableone.";".$sql_tabletwo;
    $result = mysqli_multi_query( $con,$sql);
    if (! $result ) {
        echo "<script type=\"text/javascript\">
            alert(\"multi query Record Insertion Failed.\");
            </script>";
    }
    fclose($file);
}
//throws a message if data successfully imported to mysql database from excel file
echo "<script type=\"text/javascript\">
    alert(\"CSV File has been successfully Imported.\");
    window.location = \"four.php\"
/</script>";
//close of connection
mysqli_close($con); 
}
}

Answer 1

如果表中的id列自动增加，则从查询中忽略该列（以及空值）。 或者，如果要在查询中提及该列，则可以使用NULL （未引号）。

许多很多人都很难用mysqli_multi_query()代码块查找错误，因为它没有被设置为正确输出受影响的行和错误。

我建议看一下通用代码块，它有助于隔离麻烦的查询，并阅读此答案 。

看起来您正在循环mysqli_multi_query()的两个查询。 为了提高效率，我建议构建完整的查询数组，完成循环，然后仅调用一次mysqli_multi_query() 。

ps您的插入值中是否有任何引号？ 准备好的声明将有助于解决该问题。 使用我链接中的代码块并检查错误消息。

更新：这是我的小菜一碟的答案（当然，发布之前我并没有实际测试过）：

// I assume $newdate is not user declared and considered safe.
// I am using NULL for your auto-incremented primary key `id`.
// If you want to be assured that each pair has an identical `id`, perhaps use LAST_INSERT_ID() on second query of pair.

// establish variables for future use
$inverterlog_sql="INSERT INTO `inverterlog` (`id`,`timestamp`,`irradiance`,`ambienttemp`,`photovoltaictemp`,`pv1voltage`,`pv2voltage`,`pv3voltage`,`pv1current`,`pv2current`,`pv3current`,`pv1power`,`pv2power`,`pv3power`,`pv1energy`,`pv2energy`,`pv3energy`,`gridvoltagegv1`,`gridvoltagegv2`,`gridvoltagegv3`,`gridcurrentgc1`,`gridcurrentgc2`,`gridcurrentgc3`,`gridpowergp1`,`gridpowergp2`,`gridpowergp3`,`sumofapparentpower`,`gridpowertotal`,`gridenergyge1`,`gridenergyge2`,`gridenergyge3`,`socounter`,`gridcurrentdcgc1`,`gridcurrentdcgc2`,`gridcurrentdcgc3`,`gridresidualcurrent`,`gridfrequencymean`,`dcbusupper`,`dcbuslower`,`temppower`,`tempaux`,`tempctrl`,`temppower1`,`temppowerboost`,`apparentpowerap1`,`apparentpowerap2`,`apparentpowerap3`,`sovalue`,`reactivepowerrp1`,`reactivepowerrp2`,`reactivepowerrp3`,`opmode`,`latestevent`,`pla`,`reactivepowermode`,`overexcitedunderexcited`,`reactivepowerabs`,`inverter`) VALUES (NULL,$newdate";
$data_sql="INSERT INTO `data` (`id`,`timestamp`,`gridpowertotal`,`inverter`) VALUES (NULL,'$newDate'";
$tally=0;
$x=0;

// build all queries
while(($emapData=fgetcsv($file,10000,","))!==false){
    ++$x;
    $sql[$x]=$inverterlog_sql;  // start first query of pair
    for($i=1; $i<56; ++$i){
        $sql[$x].=",'".mysqli_real_escape_string($con,$emapData[$i])."'";
    }
    $sql[$x].=",'".mysqli_real_escape_string($con,$inverter)."');";  // end first query of pair
    $sql[$x].="$data_sql,'".mysqli_real_escape_string($con,$emapData[26])."','".mysqli_real_escape_string($con,$inverter)."')";  // whole second query of pair
    fclose($file);
}

// run all queries
if(mysqli_multi_query($con,implode(';',$sql)){
    do{
        $tally+=mysqli_affected_rows($con);
    } while(mysqli_more_results($con) && mysqli_next_result($con));
}

// assess the outcome
if($error_mess=mysqli_error($con)){
    echo "<script type=\"text/javascript\">alert(\"Syntax Error: $error_mess\");</script>";
}elseif($tally!=$x*2){  // I don't expect this to be true for your case
    echo "<script type=\"text/javascript\">alert(\"Logic Error: Only $tally row",($tally!=1?"s":"")," inserted\");</script>";
}else{
    echo "<script type=\"text/javascript\">alert(\"CSV File has been successfully Imported.\"); window.location = \"four.php\"/</script>";
}
mysqli_close($con);