VFP is a weakly typed language, that is, the compiler allows operations such as assignment and comparison among variables of different types. For example, VFP allows the value of a variable to be cast to another type. The ability to use variables of different types in the same expression promotes flexibility as well as efficiency.
Note: Strong typing in Visual FoxPro 7/8/9 SP2 is not enforced at compile or run time, but is used primarily at design time.
This is true for Visual FoxPro, and for FoxBase and dBase, all of which are xBase languages.
Do you know what language this code was written in?
How do you replace a single occurrence of a character in Oracle?
For example, how do I replace a single occurrence of the percent sign with a plus sign:
'my string a%a here' should be 'my string a+a here',
while 'my string a%%a here' should still remain as 'my string a%%a here'.
I know it can be done using REGEXP_REPLACE, but I'm not sure of which regular expression to use to make it replace only a single occurrence.
won't even compile, because you're trying to insert a string "ur". Your code is expecting an entity of type user. So you want
So, you first want to query the user to get the name, then insert the new row.
using (MyDataContext dc = new MyDataContext())
var userName = (from u in dc.tblUsers
where u.Id = someId
user us = new user
Date = DateTime.Now,
name = userName
// Handle exception here
You will have to adjust the data context and table names and column names, but this should get you started.
What matters right now is the following lines of code, which are difficult for me to be understood properly:
-- Get primary key columns for full outer join
SELECT @PKCols = COALESCE(@PKCols + ' and', ' on') + ' i.' + c.COLUMN_NAME + ' = d.' + c.COLUMN_NAME
FROM INFORMATION_SCHEMA.TABLE_CONSTRAINTS pk, INFORMATION_SCHEMA.KEY_COLUMN_USAGE c
WHERE pk.TABLE_NAME = @TableName
AND CONSTRAINT_TYPE = 'PRIMARY KEY'AND c.TABLE_NAME = pk.TABLE_NAME
AND c.CONSTRAINT_NAME = pk.CONSTRAINT_NAME
This piece of code is placed inside a trigger writen on Transact-SQL (SQLServer) code. I understand more or less what is the programmer trying to get by using these lines, but what I don't understant (probably because I'm quite new on SQLServer) is what are the 'i.' and 'd.' references. By accessing the link you can discover the full code, but I had not been able to discover anythink on the code preceding it.
Another part of the code above that is a bit confusing is the following:
@PKCols = COALESCE(@PKCols + ' and', ' on')
COALESCE returns the first non-null expression, but it's difficult for me to understand the meaning of the sentence inside the complete expression shown above.
Thanks in advance, any kind of help (links, direct answer...) will be wellcome.
Is a data type that exposes automatically generated, unique binary numbers within a database. timestamp is generally used as a mechanism for version-stamping table rows. The storage size is 8 bytes. The timestamp data type is just an incrementing number and does not preserve a date or a time. To record a date or time, use a datetime data type.
I have created a WPF project (C# language) and I also have a MS Access 2007 database.
I'm trying to display the database table name in to datagrid, but i can't figur out the SQL query how to do it. The code below that I wrote it's not correct I think maybe someone can help me please and solve it...
privatevoid Window_Loaded(object sender, RoutedEventArgs e)
string ConString = ConfigurationManager.ConnectionStrings["ConString"].ConnectionString;
string CmdString = string.Empty;
using (OleDbConnection myConnection = new OleDbConnection(ConString))
CmdString = "SELECT FoodMenu FROM MSysObjects WHERE (FoodMenu Not Like 'MSys*') AND (Type In (1,4,6)) ORDER BY FoodMenu";
OleDbCommand comm = new OleDbCommand(CmdString, myConnection);
OleDbDataAdapter sda = new OleDbDataAdapter(comm);
DataTable dt = myConnection.GetSchema("Tables"); //Get list of user tables
foreach (DataRow dataRow in dt.Rows)
//DataGridMenuTables.ItemsSource = dt.DefaultView;