In my web application, I want to retrieve data from database based on the value that is passed to the function. I wrote the query as follows.
<script>
//Functions to open database and to create, insert data into tables
getSelectedRow = function(val)
{
db.transaction(function(transaction) {
transaction.executeSql('SELECT * FROM Employ where number = parseInt(val);',[], selectedRowValues, errorHandler);
});
};
selectedRowValues = function(transaction,results)
{
for(var i = 0; i < results.rows.length; i++)
{
var row = results.rows.item(i);
alert(row['number']);
alert(row['name']);
}
};
</script>
In body tag,
<body>
---
<a href = "#" onClick = "javascript:getSelectedRow('1')>getValues</a>
I got the problem while retrieving data from database, i.e., at SELECT query. It doesn't accept the value parseInt(val), if I give the condition as 'name = 1' it simply accepts the condition and give the result, but it doesn't accept 'name = parseInt(val)' and throws error as 'no such column: val code: 1' Please tell me how to pass value in 'val'.. Thanks in Advance..
This question is related to
javascript
database
The error is coming as your query is getting formed as
SELECT * FROM Employ where number = parseInt(val);
I dont know which DB you are using but no DB will understand parseInt.
What you can do is use a variable say temp and store the value of parseInt(val) in temp variable and make the query as
SELECT * FROM Employ where number = temp;
Try the following:
<script>
//Functions to open database and to create, insert data into tables
getSelectedRow = function(val)
{
db.transaction(function(transaction) {
transaction.executeSql('SELECT * FROM Employ where number = ?;',[parseInt(val)], selectedRowValues, errorHandler);
});
};
selectedRowValues = function(transaction,results)
{
for(var i = 0; i < results.rows.length; i++)
{
var row = results.rows.item(i);
alert(row['number']);
alert(row['name']);
}
};
</script>
You don't have access to javascript variable names in SQL, you must pass the values to the Database.
Source: Stackoverflow.com