How to verify the email is valid or not?
For example:
test#test.com - valid
test##.com - invalid
test#.com - invalid
Here is an example of creating a table with specific rules for mail with address (regexp). Then an example with sql query pattern (Regexp). With this you should be able to do what you want
Create table with regexp
create table Contacts (
FirstName nvarchar(30),
LastName nvarchar(30),
EmailAddress nvarchar(30) CHECK (dbo.RegExMatch('[a-zA-Z0-9_\-]+#([a-zA-Z0-9_\-]+\.)+(com|org|edu|nz)', EmailAddress)=1),
USPhoneNo nvarchar(30) CHECK (dbo.RegExMatch('\([1-9][0-9][0-9]\) [0-9][0-9][0-9]\-[0-9][0-9][0-9][0-9]', UsPhoneNo)=1))
INSERT INTO [talend].[dbo].[Contacts]
([FirstName]
,[LastName]
,[EmailAddress]
,[USPhoneNo])
VALUES
('Hallam'
,'Amine'
,'mhallam#talend.com’
,'0129-2090-1092')
,( 'encoremoi'
,'nimportequoi'
,'amine#zichji.org'
,'(122) 190-9090')
GO
Execute request sql with regexp
SELECT [FirstName]
,[LastName]
,[EmailAddress]
,[USPhoneNo]
FROM [talend].[dbo].[Contacts]
where [talend].[dbo].RegExMatch([EmailAddress],'[a-zA-Z0-9_\-]+#([a-zA-Z0-9_\-]+\.)+(com|org|edu|nz|au)') = 1
Function Code
using System;
using Microsoft.SqlServer.Server;
using System.Text.RegularExpressions;
public partial class RegExBase
{
[SqlFunction(IsDeterministic = true, IsPrecise = true)]
public static int RegExMatch( string matchString , string pattern)
{
Regex r1 = new Regex(pattern.TrimEnd(null));
if (r1.Match(matchString.TrimEnd(null)).Success == true)
{
return 1 ;
}
else
{
return 0 ;
}
}
};
For more explication show here ths tutorial -> http://www.google.ch/url?sa=t&rct=j&q=&esrc=s&source=web&cd=6&ved=0CGkQFjAF&url=http%3A%2F%2Fwww.talendforge.org%2Fbugs%2Ffile_download.php%3Ffile_id%3D4729%26type%3Dbug&ei=f8C9UKTMBNSN4gTo0IHYDg&usg=AFQjCNG-ezRtC9TdcJXuXGl4T8KX4zbUww&sig2=Fpgm5UTYOK4dpsaMfNCCyQ&cad=rja
I hope this help you
There is one newer efficient way to do that is to extend .Net functionality for SQL.
Please check details at http://msdn.microsoft.com/en-us/magazine/cc163473.aspx
One ready source code for regex match is at http://www.codeproject.com/Articles/42764/Regular-Expressions-in-MS-SQL-Server-2005-2008.
Now a simple regex for Email should do the magic for you
Hope that helps
Some years back I wrote a program about Pattern Matching – Email Validation. Hope that may help you.
Related
I am trying to do an easy search on a table that can be on any kind of database. The following query is working an the most databases, but I cannot find a solution which works on mysql.
The tables in my database are generated by the active objects framework, so I cannot change the names or config of those instances.
Here is the query that works fine on all databases but MySQL:
select * from "AO_69D057_FILTER" where "SHARED" = true AND "CONTAINS_PROJECT" = true AND UPPER("FILTER_NAME") like UPPER('%pr%').
MySql is not able to use the table name in double quotes for some reason. If I use the unquoted table name it works on MySQL but not on Postgres. Postgres is converting the table name to lowercase because it is unquoted. AO is generating the table names in upper case.
I also tried to use an alias, but that can not work because of the evaluation hierarchy of the statement.
Any suggestions how to get rid of the table name problem?
By default double quotes are used to columns.
You can change it:
SET SQL_MODE=ANSI_QUOTES;
Here is the documentation about it:
http://dev.mysql.com/doc/refman/5.7/en/sql-mode.html
I had the same problem. I select the query according to the exception I get. In the first call of the db search, I try without quotes if it fails then I try with quotes. Then I set useQueryWithQuotes variable accordingly so that in future calls I do not need to check the exception. Below is the code snipped I am using.
private Boolean useQueryWithQuotes=null;
private final String queryWithQuotes = "\"OWNER\"=? or \"PRIVATE\"=?";
private final String queryWithoutQuotes = "OWNER=? or PRIVATE=?";
public Response getReports() {
List<ReportEntity> reports = null;
if(useQueryWithQuotes==null){
synchronized(this){
try {
reports = new ArrayList<ReportEntity>( Arrays.asList(ao.find(ReportEntity.class, Query.select().where(queryWithoutQuotes, getUserKey(), false))) );
useQueryWithQuotes = false;
} catch (net.java.ao.ActiveObjectsException e) {
log("exception:" + e);
log("trying query with quotes");
reports = new ArrayList<ReportEntity>( Arrays.asList(ao.find(ReportEntity.class, queryWithQuotes, getUserKey(), false)));
useQueryWithQuotes = true;
}
}
}else{
String query = useQueryWithQuotes ? queryWithQuotes : queryWithoutQuotes;
reports = new ArrayList<ReportEntity>( Arrays.asList(ao.find(ReportEntity.class, query, getUserKey(), false)));
}
...
}
I'm trying to improve performance by replacing a dynamic field (a transient getter with no underlying database representation) with a derived field so that I can use, e.g., Criteria to query my model. The original dynamic field was pretty simple:
Client resolveClient() {
if (prevCall && prevCall.client) {
return prevCall.client
} else {
return client
}
}
I don't know how to reproduce that with a single MySQL statement, so I figured I would go ahead and stick it into a stored function, defined as follows:
CREATE FUNCTION `request_client`(requestId long) RETURNS varchar(255) CHARSET utf8
begin
declare pci long;
declare clientId long;
declare clientName varchar(255);
select request.prev_call_id
from request
where request.id = requestId
into pci;
if pci is not null then
select call_history.client_id
from call_history
where call_history.call_id = pci
into clientId;
else
select request.client_id
from request
where request.id = requestId
into clientId;
end if;
select clients.client_name
from clients
where clients.client_id = clientId
into clientName;
return clientName;
end;
And then I call that function in a derived field:
String derivedFieldName
static mapping = {
derivedFieldName formula: '(select stored_function(id))'
}
The problem is that now when I run any query on the domain, even as simple as Request.list(), I get the following exception:
Class: java.io.StreamCorruptedException
Message: invalid stream header: 32303135
For extra fun, this is an abstract domain class. I don't know if that really makes any difference; it's still persisted to the database like any other domain, and I'm calling the query on the abstract class itself, not an implementation.
The most frustrating thing is that the derived field itself does work! I can successfully retrieve a client name using it; I just can't query the overall domain.
Finally, I am pretty confident that the derived property is the issue, as I have commented it out and can then successfully query the domain.
If anybody comes across this later, the problem actually was the abstract class. And not just that it's an abstract class -- it's an abstract domain class. Apparently, Grails doesn't support derived properties on those.
To move querying to the database I just had to start saving the resolved client into my Request domain :/
I'm using EF5.0 in an ASP.NET MVC app. My Entity Model is named 'DataModel'. Included in the model is a table-valued function that exists in my MSSQL database, named MatchingEntries. It returns a table of integer ids.
I've looked at the DataModel.Context.cs file, that gets generated via the .tt (T4) template file. It has the following code in it:
[EdmFunction("DataEntities", "MatchingEntries")]
public virtual IQueryable<Nullable<int>> MatchingEntries(string term)
{
var termParameter = term != null ?
new ObjectParameter("Term", term) :
new ObjectParameter("Term", typeof(string));
return ((IObjectContextAdapter)this).ObjectContext.CreateQuery<Nullable<int>>("[DataEntities].[MatchingEntries](#Term)", termParameter);
}
The error I am getting results from using this method twice within the one query, such as:
IQueryable<int> one = db.MatchingEntries("\"one*\"");
IQueryable<int> two = db.MatchingEntries("\"two*\"");
List<int> both = one.Intersect(two).ToList();
The error is:
A parameter named 'Term' already exists in the parameter collection. Parameter names must be unique in the parameter collection.
Parameter name: parameter
Is this a known limitation of the classes generated from an EDMX for table-valued functions? With LINQ2SQL I am able to execute this a a single query to the database (that does a JOIN between the 2 outputs from MatchingEntries) and it replaces the parameter name #Term with #p0 and #p1 for the two different instances of the call. I'd like to make Entity Framework do the same.
So, my question is, how can I get EF to work in the same manner and avoid the 'Duplicate parameter' error?
My fallback is to evaluate each call to db.MatchingEntries separately, by putting ToList() after them. My other idea has been to replace the ObjectParameter name in the T4 generated Context.cs class with something randomly generated each time. These feel like hacks that I should be able to avoid.
This answer is Linq to Entities specific. This doesn't have to be done in Linq to SQL (Linqpad).
Thanks to this question I got a pointer to a viable solution:
extend the autogenerated DBContext class (partial class)
add a method with two parameters in the partial class
at calling, pass an index as second parameter
Detailed Answer:
DataEntitys.my.cs:
[EdmFunction("DataEntities", "MatchingEntries")]
public virtual IQueryable<Nullable<int>> MatchingEntries(string term, int index)
{
string param_name = String.Format("k_{0}", index);
var termParameter = term != null ?
new ObjectParameter(param_name, term) :
new ObjectParameter(param_name, typeof(string));
return ((IObjectContextAdapter)this).
ObjectContext.CreateQuery<Nullable<int>>(
String.Format("[DataEntities].[MatchingEntries](#{0})", param_name),
termParameter);
}
Call the function:
foreach (string teil in such)
{
index++;
if (teil.Trim() != "")
res = res.Join(db.MatchingEntries("\"" + teil + "*\"", index), l => l.ID, s => s.KEY, (l, s) => l);
}
I have made a tiny software tool that allows me to display or run SQL generated from NHibernate. I made this because hbm2ddl.auto is not recommended for production.
I have one problem: when I generate the SQL I always get the infamous Index column unquoted, because I need .AsList() mappings. This prevents me to run the SQL.
In theory, if I had an XML configuration of NHibernate I could use hbm2ddl.keywords tag, but unfortunately since my tool is designed as a DBA-supporting tool for multiple environments, I must use a programmatic approach.
My approach (redundant) is the following:
private static Configuration BuildNHConfig(string connectionString, DbType dbType, out Dialect requiredDialect)
{
IPersistenceConfigurer persistenceConfigurer;
switch (dbType)
{
case DbType.MySQL:
{
persistenceConfigurer =
MySQLConfiguration
.Standard
.Dialect<MySQL5Dialect>()
.Driver<MySqlDataDriver>()
.FormatSql()
.ShowSql()
.ConnectionString(connectionString);
requiredDialect = new MySQL5Dialect();
break;
}
case DbType.MsSqlAzure:
{
persistenceConfigurer = MsSqlConfiguration.MsSql2008
.Dialect<MsSqlAzure2008Dialect>()
.Driver<SqlClientDriver>()
.FormatSql()
.ShowSql()
.ConnectionString(connectionString);
requiredDialect = new MsSqlAzure2008Dialect();
break;
}
default:
{
throw new NotImplementedException();
}
}
FluentConfiguration fc = Fluently.Configure()
.Database(persistenceConfigurer)
.ExposeConfiguration(
cfg => cfg.SetProperty("hbm2ddl.keywords", "keywords")
.SetProperty("hbm2ddl.auto", "none"))
.Mappings(
m => m.FluentMappings.AddFromAssemblyOf<NHibernateFactory>());
Configuration ret = fc.BuildConfiguration();
SchemaMetadataUpdater.QuoteTableAndColumns(ret);
return ret;
}
...
public static void GenerateSql(MainWindowViewModel viewModel)
{
Dialect requiredDialect;
Configuration cfg = BuildNHConfig(viewModel.ConnectionString, viewModel.DbType.Value, out requiredDialect);
StringBuilder sqlBuilder = new StringBuilder();
foreach (string sqlLine in cfg.GenerateSchemaCreationScript(requiredDialect))
sqlBuilder.AppendLine(sqlLine);
viewModel.Sql = sqlBuilder.ToString();
}
Explanation: when I want to set the ViewModel's SQL to display on a TextBox (yea, this is WPF) I initialize the configuration programmatically with connection string given in ViewModel and choose the dialect/provider accordingly. When I Fluently Configure NHibernate I both set hbm2ddl.keywords (tried both auto-quote and keywords, this being the default) and, following this blog post, I also use the SchemaMetadataUpdater.
The result is that I'm always presented with SQL like
create table `OrderHistoryEvent` (Id BIGINT NOT NULL AUTO_INCREMENT, EventType VARCHAR(255) not null, EventTime DATETIME not null, EntityType VARCHAR(255), Comments VARCHAR(255), Order_id VARCHAR(255), Index INTEGER, primary key (Id))
where the guilty Index column is not quoted.
The question is: given a programmatic and fluent configuration of NHibernate, how do I tell NHibernate to quote any reserved word in the SQL exported by GenerateSchemaCreationScript?
I have found a workaround: when I generate the update script (the one that runs with hbm2ddl.auto=update) the script is correctly quoted.
The infamous Index column has been already discussed and from my findings it's hardcoded in FNH (ToManyBase.cs, method public T AsList()).
Since the update script is a perfectly working creational script on an empty database, changing the code to generate an update script on an empty DB should equal generating a creational script.
This happens only because I want to generate the script on my own. There is probably a bug in NHibernate that only activates when you call GenerateSchemaCreationScript and not when you let your SessionFactory build the DB for you
How do I code the Select clause in my LINQ satament to select column aliases so I can sort on them basically I want to accomplish this SQL statement in LINQ:
select
type_id as id,
type_desc as description
from
dbo.equip_type_avt
order by
description
What do I replace the ????? in my .Select clause in my LINQ statement?
public IQueryable<equip_type_avt> GetGridEquipmentTypes(string sidx, string sord)
{
try
{
return
ulsDB.equip_type_avts
.Select(?????)
.OrderBy(sidx + " " + sord);
}
catch (Exception ex)
{
string strErr = ex.Message;
return null;
}
}
You can use an anonymous type:
table.Select(x => new
{
ID = x.type_id,
Description = x.type_desc
});
However, you can't access the properties of an anonymous type outside of the scope where it is declared (without reflection or other dirty hackery, anyway) so if you want to use the result outside of that function you just create a class and create an instance of it in the query using a type initializer:
public class Foobar
{
public int ID { get; set; }
public string Description { get; set; }
}
...
table.Select(x => new Foobar() // Note the difference here
{
ID = x.type_id,
Description = x.type_desc
});
Question though: if you want to name the columns differently, why don't you change it in the place where the column-property mapping is declared? In LINQ-to-SQL you can have the database column be named whatever you like but give the property the name "ID" or "Description".
I'm not sure i understand your question, how does sidx and sord relate to your query?
Isn't your problem rather that you have to end your query with OrderBy(...).ThenBy(...) instead of a combined OrderBy?
If you want to sort by a string in the easy way, download the Dynamic LINQ library.
However, that's 2000 lines of code, most of which are entirely redundant for just the purpose of sorting.
Doing it yourself shouldn't be too hard, but requires a fair bit of knowledge on expression trees. I can't really help you there though.
EDIT: I've added another answer, that hopefully answers your actual question :)