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有没有什么办法可以将mysql变量与mysql函数结果连接到一个insert语句中?如何连接PHP变量与mysql函数导致INSERT语句
我有下面的代码: “$ currYear”
$conn = new mysqli("localhost", "root", "", "facturas");
$currDate = date("Y/m/d");
$currYear = date("y");
$S = "SELECT num_factura FROM facturas WHERE num_factura";
if($currYear > date("y")) {
$sql = "INSERT INTO facturas (anyo, num_factura) VALUES ('$currDate', '".$currYear.(1)."')";
} else {
if($conn->query($S)->num_rows > 0) {
$sql = "INSERT INTO facturas (anyo, num_factura) VALUES ('$currDate', (SELECT MAX(h1.num_factura)+1 FROM facturas h1))";
} else {
$sql = "INSERT INTO facturas (anyo, num_factura) VALUES ('$currDate', '".$currYear.(1)."')";
}
}
我想连接与SELECT(MAX)功能,我已经试过”的$ currYear变量(SELECT MAX(h1.num_factura )+1 FROM facturas h1)',但它并不按我想要的方式工作,它将max列num_facturas递增1,并与$ currYear变量连接。