Question

在SQL Server中使用PHP时遇到一些问题，我的代码中包含此查询。

  Api::$eloquent->connection('cis')->select("
    SELECT
        SUM (DET.Peso_Salida) AS total,
      CLI.[Codigo Grupo] AS grupo
    FROM
        BNF2.SECO_DEVOLUCION_DETALLE AS DET
    INNER JOIN BNF2.SECO_DEVOLUCION_MAESTRO AS MAS ON DET.Correlativo_Maestro = MAS.Correlativo_Maestro AND MAS.Codigo_Cosecha=:co1
    INNER JOIN BNF.DETALLES_GENERALES_PESOS_2 AS REC ON DET.Numero_Lote=REC.Numero_Lote AND REC.Codigo_Cosecha=:co2
    INNER JOIN BNF.V_CLIENTES_CON_GRUPO AS CLI ON REC.Codigo_Entidad_Cliente_Actual= CLI.Codigo
    GROUP BY CLI.[Codigo Grupo]  
    ", [':co1' => $this->cosecha, ':co2' => $this->cosecha]);

查询用时15秒，SQL Server用100％CPU，现在，如果我删除代码中的参数，查询将很快花费103ms，所以我不明白为什么参数是放慢查询速度

Api::$eloquent->connection('cis')->select("
SELECT
    SUM (DET.Peso_Salida) AS total,
  CLI.[Codigo Grupo] AS grupo
FROM
    BNF2.SECO_DEVOLUCION_DETALLE AS DET
INNER JOIN BNF2.SECO_DEVOLUCION_MAESTRO AS MAS ON DET.Correlativo_Maestro = MAS.Correlativo_Maestro AND MAS.Codigo_Cosecha=9
INNER JOIN BNF.DETALLES_GENERALES_PESOS_2 AS REC ON DET.Numero_Lote=REC.Numero_Lote AND REC.Codigo_Cosecha=9
INNER JOIN BNF.V_CLIENTES_CON_GRUPO AS CLI ON REC.Codigo_Entidad_Cliente_Actual= CLI.Codigo
GROUP BY CLI.[Codigo Grupo]
", []);

运行得很好，有什么主意吗？

Answer 1

您应该使用参数化查询或存储过程。

导致查询性能下降的原因可能很多，只有Table info（包括数据类型和长度）和Query Plan才能显示出来。

索引就是其中之一。

由于您的问题就像"when using variable then query is slow. Query perform ok with constant value"

几天前，我们讨论了类似的事情。

Variables make query performance worse

使用php雄辩和sqlserver进行查询需要很长时间

1 个答案: