这是我第一次使用多个INNER JOIN
S编写代码,它们的关系只是一个表。
这就是我正在做的:
$table = $_POST['tabla'];
$campos = $_POST['campos'];
$campoRelacion = $_POST['campo_relacion'];
**//Code that i forget to put**
*// Create an array that will contain the fields
$ field = array ();
//walk the array of fields and is assigned to the array
//that was created previously
foreach ($ fields as $ val) {
$ field [] = "". $ val. "";
}
//We separate the fields in the array with commas
$ field = join (',', $ field);*
$mainTable = $table[0];
$sql = 'SELECT '.$field.'
FROM '.$mainTable.' ';
for ($i = 1; $i<count($table); $i++) {
$curTable = $table[$i];
$joinField = $campoRelacion[$i-1];
$sql.= 'INNER JOIN '.$curTable.'
ON '.$mainTable.'.'.$joinField.' = '.$curTable.'.'.$joinField.' ';
}
根据我发送的数据,这个输出会是这样的:
SELECT
slip_plantillas.nombre,
cat_reaseguradoras.nombre,
slips.numero_referencia,
slips.asegurado_original,
tipo_operaciones.nombre
FROM
slips
Inner Join slip_plantillas ON slips.slip_plantillaID = slip_plantillas.slip_plantillaID
Inner Join cat_reaseguradoras ON slips.cat_reaseguradoraID = cat_reaseguradoras.cat_reaseguradoraID
Inner Join tipo_operaciones ON slips.tipo_operacionID = tipo_operaciones.tipo_operacionID
如上表所示,代码滑差在联接中保持不变。
但现在我有了另一个sql语句,我想在slips不恒定和更改并集的地方进行。
查询如下:
SELECT
slip_dos_reasegurado.prima_cien,
slip_dos_reasegurado.porcentaje_aseguradora,
cat_reaseguradoras.nombre,
slip_dos_capas.capa,
slip_dos_capas.prima_capa,
slip_dos_pagos.cantidad,
slip_dos_pagos.referencia,
estatus.nombre,
slips.tipo_negocio
FROM
slips
Inner Join slip_dos_reasegurado ON slips.slipID = slip_dos_reasegurado.slipID
Inner Join slip_dos_capas ON slip_dos_capas.slip_dos_reaseguradoID = slip_dos_reasegurado.slip_dos_reaseguradoID
Inner Join slip_dos_pagos ON slip_dos_capas.slip_dos_capaID = slip_dos_pagos.slip_dos_capaID
Inner Join cat_reaseguradoras ON cat_reaseguradoras.cat_reaseguradoraID = slip_dos_reasegurado.cat_reaseguradoraID
Inner Join estatus ON estatus.estatusID = slip_dos_pagos.estatusID
正如您所看到的,如果关系不根据字段关系相互混合,则关系不再是单个表。
也许你需要这个?
<?php
$tables = array('tbl1','tbl2','tbl3','tbl4');
$columnTable = array('column1','column2','column3','column4');
$columnRelation = array('column_relation1','column_relation2','column_relation3','column_relation4');
$mainTable = $tables[0];
$sql = 'SELECT *
FROM '.$mainTable.' ';
foreach($tables as $index=>$tbl){
if($index == 0) continue; //Normal only while you know that your array indexes start from 0, in other case you would need variable for this
$sql .= 'INNER JOIN $tbl ON '.$tbl.'.'.$columnTable[$index].' = '.$tables[$index-1].'.'.$columnRelation[$index-1].' ';
}
echo $sql;
?>