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PHP variable causing my SQL query to fail, but hard-coding the same values into the query works Why is this?.


PHP variable causing my SQL query to fail, but hard-coding the same values into the query works Why is this?.

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PHP variable causing my SQL query to fail, but hard-coding the same values into the query works Why is this?.
Tag : php , By : Shawazi
Date : November 28 2020, 04:01 AM

around this issue use double quoted string "" instead of single quote '' Or use string concatenation with variable if you are using single quote string.
<?php include 'db.php'; 
$volID = 4;
//echo $volID;
$sql = "SELECT EventID FROM teams WHERE Volunteer2ID=$volID";
//OR $sql ='SELECT EventID FROM teams WHERE Volunteer2ID=' . $volID;
$result = $conn->query($sql);
 if ($result->num_rows > 0) {
      //perform some action with the results.
 } else {
      echo "No event to display";
 }

?>

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Why is using DBI's variable-binding causing a MySQL query to fail?


Tag : mysql , By : sgmichelsen
Date : March 29 2020, 07:55 AM
help you fix your problem When you bind a variable to a placeholder, MySQL uses exactly what is in the Perl variable. When you interpolate a variable into a SQL statement, MySQL treats it as a string literal.
MySQL handles unknown backslash escapes by removing the backslash. As MySQL string literals, '\S' and 'S' are equivalent. When you use placeholders, '\S' in a Perl variable is equivalent to '\\S' as a MySQL string literal.
my $aes_key = 'X`ku@wC_BISgY[S%/<iaB>&VXd5zDA+'; # note missing backslash
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Create query in sparql using jena without hard coding the query?


Tag : development , By : protagonist
Date : March 29 2020, 07:55 AM
Hope this helps Can you add more detail on what you want to do i.e. is there a general template to your queries or particular types of queries you want to make?
Jena does have some support for substituting variables into prepared queries so you can hard code a template and then substitute values as desired based on your inputs. But whether this is applicable depends on what queries you want to make.

How to use SUM IF() in MySQL without hard coding values in the query


Tag : mysql , By : Sergio Rudenko
Date : March 29 2020, 07:55 AM
help you fix your problem You can return each count as a separate row, and then filter as needed in the application layer:
select storeid, marketsegmentid, count(*) as Count
from storemarketsegments 
group by storeid, marketsegmentid;

When I run a C# parameterized query, it times out. Same query with hard-coded parameters works fine


Tag : chash , By : Pancilobak
Date : March 29 2020, 07:55 AM
may help you . I want to get all IDs where the Text column contains the string filter. , SOLVED! I set the search up as a stored procedure:
SQL:
CREATE PROCEDURE TextSearch 
@filter varchar(MAX) = ''
AS
BEGIN
    SET NOCOUNT ON;
    SELECT DISTINCT ID FROM TableName WHERE [Text] LIKE '%' + @filter + '%'
END
GO
 SqlCommand cmd = new SqlCommand("TextSearch", conn);
 cmd.CommandType = CommandType.StoredProcedure;
 cmd.Parameters.Add(new SqlParameter("@filter", filter));

Printing from hard-coding works but how do I print the values from these variable inputs from defined methods in Python?


Tag : python , By : Karina
Date : March 29 2020, 07:55 AM
hope this fix your issue There is no return for the KeyInString(n) function and the other function, therefore, nothing is stored in the variable.
try this:
def KeyInString(n):
    while True:
        try:
            n = str(input('Enter> '))
        except StandardError:
            print("Error encountered! Please try again.\n")
            continue
    return n
def KeyInString():
    while True:
        try:
            n = str(input('Enter> '))
        except StandardError:
            print("Error encountered! Please try again.\n")
            continue
    return n
EMail = KeyInString()
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