Is there unpivot or cross apply in ServiceStack ormlite? - sql

I am using ServiceStack 4.5.14. I want to pass a list of Guid to such as below query.
Table Name: Image
Columns: (Id -> Type=Guid) (ImageId -> Type=Guid) (Guid -> Type=Guid)
var result = Db.ExecuteSql("select value from image unpivot (value for col in (Id, ImageId)) un where Guid=(#param) order by Guid",
new { param = "5de7f247-f590-479a-9c29-2e68a57e711c" });
It returns a result which their Id and ImageId are 000.... while they are null.
Another question is: how can I send a list of Guid as parameter to above query?

To query a parameterized field you should include the Guid instead of the string, e.g:
var result = Db.ExecuteSql(
#"select value from image unpivot (value for col in (Id, ImageId)) un
where Guid=(#param) order by Guid",
new { param = new Guid("5de7f247-f590-479a-9c29-2e68a57e711c") });
If values are null, it's likely masquerading an error, you can bubble errors with:
OrmLiteConfig.ThrowOnError = true;
Or enable debug logging with:
LogManager.LogFactory = new ConsoleLogFactory();
In v5+ you can also inspect SQL commands before they're executed with:
OrmLiteConfig.BeforeExecFilter = dbCmd => Console.WriteLine(dbCmd.GetDebugString());

Related

How to insert multiple integer parameters into query?

Website user can enter search criteria to query orders. User, States, Status, OrderID, etc.
Website communicates with API. Query parameters are in the header, so I assume they come in as strings. API communicates with Access via Dapper.
For some criteria, they can send multiple values. So I want to use an "IN" clause.
where UserID in (150, 3303, 16547)
Dapper handles this nicely.
connection.Query<int>("select * from table where Id in #Ids", new { Ids = new int[] { 1, 2, 3 } });
This works in MS-Access
SELECT top 100 * from Orders where UserID in (150, 30330)
But that only works when the values are ints. String and Strings both give "Data type mismatch in criteria expression" in Access.
SELECT top 100 * from Orders where UserID in ("150", "30330") // two strings
SELECT top 100 * from Orders where UserID in ("150, 30330") // single string
It may be a coincidence, but all the examples I see are integers. Access throws an error on strings if you don't specify the size. Using DynamicParameters makes it easy to specify the size.
But when the field is an int, my dapper code gives the same error (Data type mismatch in criteria expression):
var paramlist = new DynamicParameters();
if ((!string.IsNullOrWhiteSpace(userId)) && userId != "0") {
paramlist.Add("userId", userId, DbType.String, ParameterDirection.Input, 50);
sbWhere.AppendFormat("AND CustFID in (?) ", paramIndex++);
}
So I assume the issue is that I'm telling it that the parameter is a string.
But if I make the parameter an int, then it won't take the string with multiple values. Conversely, if I include the () in the string, it complains about the parens being missing from the 'in' clause.
I tried splitting the string of numbers into an array and/or list.
if ((!string.IsNullOrWhiteSpace(userId)) && userId != "0") {
var userIds = userId.Split(','); //.ToList(); fails, can't map to native type
paramlist.Add("userId", userIds, DbType.String, ParameterDirection.Input, 1000);
if (userIds.Length > 1) {
sbWhere.AppendFormat("AND CustFID in #userId ", paramIndex++);
} else {
sbWhere.AppendFormat("AND CustFID = #userId ", paramIndex++);
}
}
and it gives ": No mapping exists from object type System.String[] to a known managed provider native type." whether I say the parameters are int32 or string.
UPDATE:
There may be multiple search criteria, so I'm using DynamicParameters.
Here is my attempt at implementing Palle Due's idea.
if ((!string.IsNullOrWhiteSpace(userId)) && userId != "0") {
// var userIds = userId.Split(',').Select(i => Int32.Parse(i)).ToList();// fails, can't map to native type
IEnumerable<int> userIds = userId.Split(',').Select<string, int>(int.Parse);
paramlist.Add("userId", userIds, DbType.Int32, ParameterDirection.Input);
if (userIds.Count() > 1) {
sbWhere.AppendFormat("AND CustFID in #userId ", paramIndex++);
} else {
sbWhere.AppendFormat("AND CustFID = #userId ", paramIndex++);
}
}
using (IDbConnection conn = Connection) {
string sQuery = string.Format("SELECT {0} FROM vwweb_Orders {1}", columns, where);
conn.Open();
var result = await conn.QueryAsync<Order>(sQuery, paramlist);
return result.ToList();
}
throws
Message: System.AggregateException : One or more errors occurred. (Failed to convert parameter value from a SelectArrayIterator`2 to a Int32.)
----> System.InvalidCastException : Failed to convert parameter value from a SelectArrayIterator`2 to a Int32.
----> System.InvalidCastException : Object must implement IConvertible.
The github page #Dai links to specifies that the Dapper list support only works with IEnumerable<int>.
But as I understand it your UserID is an int, so I don't get why you try to enter a string. You need to get the string the user has input and convert it to IEnumerable<int>. Do something like this:
IEnumerable<int> userIDs = (userId?? "").Split(',').Select<string, int>(int.Parse);
var result = connection.Query<int>("SELECT TOP 100 * FROM Orders WHERE UserID IN #Ids", new { Ids = userIDs });
You might want to apply some input checking to that, and you might also want to reconsider using Access as the "database" for a website. It's not what it was meant for.
I give up. Dapper should be able to handle this, but it's a newer feature, so...
I just built the IN clause myself.
if (userIds.Count() > 1) {
sbWhere.AppendFormat("AND CustFID in ( ");
int paramCnt = 0;
foreach (int id in userIds) {
sbWhere.AppendFormat("?, "); // Access doesn't mind a trailing ,
paramlist.Add("userId" + paramCnt.ToString(), id, DbType.Int32, ParameterDirection.Input);
paramCnt++;
}
sbWhere.AppendFormat(") ");
} else {
sbWhere.AppendFormat("AND CustFID = ? ");
paramlist.Add("userId", userIds.ToArray<int>()[0], DbType.Int32, ParameterDirection.Input);
}

ATG - How to override RQL for insert statements

I need to insert records to an Oracle DB table that already has records in it by using the table's sequence.
I tried using RQL which creates an auto-generated id for the primary key but sometimes those generated ids already exist in the database and as a result, a constraint violation error is thrown.
ATG documentation provides an alternative named Overriding RQL-Generated SQL but I didn't manage to make it work for insert statements.
GSARepository repo =
(GSARepository)request.resolveName("/examples/TestRepository");
RepositoryView view = repo.getView("canard");
Object params[] = new Object[4];
params[0] = new Integer (25);
params[1] = new Integer (75);
params[2] = "french";
params[3] = "greek";
Builder builder = (Builder)view.getQueryBuilder();
String str = "SELECT * FROM usr_tbl WHERE (age_col > 0 AND age_col < 1
AND EXISTS (SELECT * from subjects_tbl where id = usr_tbl.id AND subject
IN (2, 3)))";
RepositoryItem[] items =
view.executeQuery (builder.createSqlPassthroughQuery(str, params));
Is there any way to use table's sequence for insert statements via ATG Repository API?
Eventually, I did not manage to make it work but I found the following solution.
I retrieved the sequence number as below and then used it in the RQL insert statement.
RepositoryView view = getRestServiceDetailsRepository().getView("wsLog");
String sql = "select log_seq.nextval from dual";
Object[] params = {};
Builder builder = (Builder) view.getQueryBuilder();
Query query = builder.createSqlPassthroughQuery(sql, params);
RepositoryItem[] items = view.executeQuery(query);
if (items != null && items.length > 0) {
items[0].getRepositoryId();
}

SQL Server CE update or insert query

In my Windows Forms application, I'm using a SQL Server Compact database. I have a function in which I want to update the columns 'id' and 'name' in table 'owner', unless the specified id does not exist, in which case I want new values inserted.
For example, my current table has 'id' 1 and 2. It MIGHT have 'id' 3. User enters data to insert/update id 3.
I want my query to do something like this:
UPDATE owner
SET name = #InputN
WHERE id = 3
IF ##ROWCOUNT = 0
INSERT INTO owner (id, name) VALUES 3, #InputN
How should I define my query in order to make this work in SQL Server Compact Edition?
You should do it in your form codes. This way you don't even need to check if there is an di with the value=3. It will check it by itself and update the row if it exists. If not you won't get any errors.
RSSql.UpdateNonQueryParametric("update owner set name=? where id=3", newname);
public static void UpdateNonQueryParametric(string query, params Object[] parameters)
{
SqlCeParameter[] param = new SqlCeParameter[parameters.Length];
for (int i = 0; i < parameters.Length; i++)
{
param[i] = new SqlCeParameter();
param[i].Value = parameters[i];
}
_cnt = new SqlCeConnection();
_cnt.ConnectionString = ConnectionString;
_cmd = new SqlCeCommand();
_cmd.Connection = _cnt;
_cmd.CommandType = System.Data.CommandType.Text;
_cmd.CommandText = query;
_cmd.Parameters.AddRange(param);
if (_cnt.State != System.Data.ConnectionState.Open)
_cnt.Open();
_cmd.ExecuteNonQuery();
_cmd.Dispose();
if (_cnt.State != System.Data.ConnectionState.Closed)
_cnt.Close();
_cnt.Dispose();
}

Dynamic Linq creation

I am re-writing a query which is created in response to user's entry into text fields in order to offer some protection against SQL injection attack.
SELECT DISTINCT (FileNameID) FROM SurNames WHERE Surname IN
('Jones','Smith','Armitage')
AND FileNameID IN ( SELECT DISTINCT (FileNameID) FROM FirstNames WHERE FirstName
IN ('John','William') )
There can be up to 3 other tables involved in this process.
The parameter lists can be up to 50-100 entries so building a parameterized query is tedious and cumbersome.
I am trying to create a Linq query which should take care of the parameterization and offer the protection I need.
This gives me what I need
var surnameValues = new[] { "Jones","Smith","Armitage" };
var firstnameValues = new[] { "John","William" };
var result = (from sn in db.Surnames
from fn in db.FirstNames
where surnameValues.Contains(sn.Surname) &&
firstnameValues.Contains(fn.FirstName)
select fn.FileNameID).Distinct().ToArray();
I now need a way to dynamically create this depending upon whether the user has selected/entered values in the surname or firstname text entry boxes?
Any pointers will be gratefully received
Thanks
Roger
you could combine all the logic into the query;
var surnameValues = new[] { "Jones","Smith","Armitage" };
var firstnameValues = null;
// Set these two variables to handle null values and use an empty array instead
var surnameCheck= surnameValues ?? new string[0];
var firstnameCheck= firstnameValus ?? new string[0];
var result = (from sn in db.Surnames
from fn in db.FirstNames
where
(!surnameCheck.Any() || surnameCheck.Contains(sn.Surname)) &&
(!firstnameCheck.Any() || firstnameCheck.Contains(fn.FirstName))
select fn.FileNameID).Distinct().ToArray();
Your query doesn't seem to have a join condition betwwen the Surnames table and the firstNames table?
You could dynamically build the query (as you appear to be doing I cross join I've used SelectMany)
var query=db.Surnames.SelectMany(sn=>db.FirstNames.Select (fn => new {fn=fn,sn=sn}));
if (surnameValues!=null && surnameValues.Any()) query=query.Where(x=>surnameValues.Contains(x.sn.Surname));
if (firstnameValues !=null && firstnameValues.Any()) query=query.Where(x=>firstnameValues.Contains(x.fn.FirstName));
var result=query.Select(x=>x.fn.FileNameID).Distinct();

error, string or binary data would be truncated when trying to insert

I am running data.bat file with the following lines:
Rem Tis batch file will populate tables
cd\program files\Microsoft SQL Server\MSSQL
osql -U sa -P Password -d MyBusiness -i c:\data.sql
The contents of the data.sql file is:
insert Customers
(CustomerID, CompanyName, Phone)
Values('101','Southwinds','19126602729')
There are 8 more similar lines for adding records.
When I run this with start > run > cmd > c:\data.bat, I get this error message:
1>2>3>4>5>....<1 row affected>
Msg 8152, Level 16, State 4, Server SP1001, Line 1
string or binary data would be truncated.
<1 row affected>
<1 row affected>
<1 row affected>
<1 row affected>
<1 row affected>
<1 row affected>
Also, I am a newbie obviously, but what do Level #, and state # mean, and how do I look up error messages such as the one above: 8152?
From #gmmastros's answer
Whenever you see the message....
string or binary data would be truncated
Think to yourself... The field is NOT big enough to hold my data.
Check the table structure for the customers table. I think you'll find that the length of one or more fields is NOT big enough to hold the data you are trying to insert. For example, if the Phone field is a varchar(8) field, and you try to put 11 characters in to it, you will get this error.
I had this issue although data length was shorter than the field length.
It turned out that the problem was having another log table (for audit trail), filled by a trigger on the main table, where the column size also had to be changed.
In one of the INSERT statements you are attempting to insert a too long string into a string (varchar or nvarchar) column.
If it's not obvious which INSERT is the offender by a mere look at the script, you could count the <1 row affected> lines that occur before the error message. The obtained number plus one gives you the statement number. In your case it seems to be the second INSERT that produces the error.
Just want to contribute with additional information: I had the same issue and it was because of the field wasn't big enough for the incoming data and this thread helped me to solve it (the top answer clarifies it all).
BUT it is very important to know what are the possible reasons that may cause it.
In my case i was creating the table with a field like this:
Select '' as Period, * From Transactions Into #NewTable
Therefore the field "Period" had a length of Zero and causing the Insert operations to fail. I changed it to "XXXXXX" that is the length of the incoming data and it now worked properly (because field now had a lentgh of 6).
I hope this help anyone with same issue :)
Some of your data cannot fit into your database column (small). It is not easy to find what is wrong. If you use C# and Linq2Sql, you can list the field which would be truncated:
First create helper class:
public class SqlTruncationExceptionWithDetails : ArgumentOutOfRangeException
{
public SqlTruncationExceptionWithDetails(System.Data.SqlClient.SqlException inner, DataContext context)
: base(inner.Message + " " + GetSqlTruncationExceptionWithDetailsString(context))
{
}
/// <summary>
/// PArt of code from following link
/// http://stackoverflow.com/questions/3666954/string-or-binary-data-would-be-truncated-linq-exception-cant-find-which-fiel
/// </summary>
/// <param name="context"></param>
/// <returns></returns>
static string GetSqlTruncationExceptionWithDetailsString(DataContext context)
{
StringBuilder sb = new StringBuilder();
foreach (object update in context.GetChangeSet().Updates)
{
FindLongStrings(update, sb);
}
foreach (object insert in context.GetChangeSet().Inserts)
{
FindLongStrings(insert, sb);
}
return sb.ToString();
}
public static void FindLongStrings(object testObject, StringBuilder sb)
{
foreach (var propInfo in testObject.GetType().GetProperties())
{
foreach (System.Data.Linq.Mapping.ColumnAttribute attribute in propInfo.GetCustomAttributes(typeof(System.Data.Linq.Mapping.ColumnAttribute), true))
{
if (attribute.DbType.ToLower().Contains("varchar"))
{
string dbType = attribute.DbType.ToLower();
int numberStartIndex = dbType.IndexOf("varchar(") + 8;
int numberEndIndex = dbType.IndexOf(")", numberStartIndex);
string lengthString = dbType.Substring(numberStartIndex, (numberEndIndex - numberStartIndex));
int maxLength = 0;
int.TryParse(lengthString, out maxLength);
string currentValue = (string)propInfo.GetValue(testObject, null);
if (!string.IsNullOrEmpty(currentValue) && maxLength != 0 && currentValue.Length > maxLength)
{
//string is too long
sb.AppendLine(testObject.GetType().Name + "." + propInfo.Name + " " + currentValue + " Max: " + maxLength);
}
}
}
}
}
}
Then prepare the wrapper for SubmitChanges:
public static class DataContextExtensions
{
public static void SubmitChangesWithDetailException(this DataContext dataContext)
{
//http://stackoverflow.com/questions/3666954/string-or-binary-data-would-be-truncated-linq-exception-cant-find-which-fiel
try
{
//this can failed on data truncation
dataContext.SubmitChanges();
}
catch (SqlException sqlException) //when (sqlException.Message == "String or binary data would be truncated.")
{
if (sqlException.Message == "String or binary data would be truncated.") //only for EN windows - if you are running different window language, invoke the sqlException.getMessage on thread with EN culture
throw new SqlTruncationExceptionWithDetails(sqlException, dataContext);
else
throw;
}
}
}
Prepare global exception handler and log truncation details:
protected void Application_Error(object sender, EventArgs e)
{
Exception ex = Server.GetLastError();
string message = ex.Message;
//TODO - log to file
}
Finally use the code:
Datamodel.SubmitChangesWithDetailException();
Another situation in which you can get this error is the following:
I had the same error and the reason was that in an INSERT statement that received data from an UNION, the order of the columns was different from the original table. If you change the order in #table3 to a, b, c, you will fix the error.
select a, b, c into #table1
from #table0
insert into #table1
select a, b, c from #table2
union
select a, c, b from #table3
on sql server you can use SET ANSI_WARNINGS OFF like this:
using (SqlConnection conn = new SqlConnection("Data Source=XRAYGOAT\\SQLEXPRESS;Initial Catalog='Healthy Care';Integrated Security=True"))
{
conn.Open();
using (var trans = conn.BeginTransaction())
{
try
{
using cmd = new SqlCommand("", conn, trans))
{
cmd.CommandText = "SET ANSI_WARNINGS OFF";
cmd.ExecuteNonQuery();
cmd.CommandText = "YOUR INSERT HERE";
cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
cmd.CommandText = "SET ANSI_WARNINGS ON";
cmd.ExecuteNonQuery();
trans.Commit();
}
}
catch (Exception)
{
trans.Rollback();
}
}
conn.Close();
}
I had the same issue. The length of my column was too short.
What you can do is either increase the length or shorten the text you want to put in the database.
Also had this problem occurring on the web application surface.
Eventually found out that the same error message comes from the SQL update statement in the specific table.
Finally then figured out that the column definition in the relating history table(s) did not map the original table column length of nvarchar types in some specific cases.
I had the same problem, even after increasing the size of the problematic columns in the table.
tl;dr: The length of the matching columns in corresponding Table Types may also need to be increased.
In my case, the error was coming from the Data Export service in Microsoft Dynamics CRM, which allows CRM data to be synced to an SQL Server DB or Azure SQL DB.
After a lengthy investigation, I concluded that the Data Export service must be using Table-Valued Parameters:
You can use table-valued parameters to send multiple rows of data to a Transact-SQL statement or a routine, such as a stored procedure or function, without creating a temporary table or many parameters.
As you can see in the documentation above, Table Types are used to create the data ingestion procedure:
CREATE TYPE LocationTableType AS TABLE (...);
CREATE PROCEDURE dbo.usp_InsertProductionLocation
#TVP LocationTableType READONLY
Unfortunately, there is no way to alter a Table Type, so it has to be dropped & recreated entirely. Since my table has over 300 fields (😱), I created a query to facilitate the creation of the corresponding Table Type based on the table's columns definition (just replace [table_name] with your table's name):
SELECT 'CREATE TYPE [table_name]Type AS TABLE (' + STRING_AGG(CAST(field AS VARCHAR(max)), ',' + CHAR(10)) + ');' AS create_type
FROM (
SELECT TOP 5000 COLUMN_NAME + ' ' + DATA_TYPE
+ IIF(CHARACTER_MAXIMUM_LENGTH IS NULL, '', CONCAT('(', IIF(CHARACTER_MAXIMUM_LENGTH = -1, 'max', CONCAT(CHARACTER_MAXIMUM_LENGTH,'')), ')'))
+ IIF(DATA_TYPE = 'decimal', CONCAT('(', NUMERIC_PRECISION, ',', NUMERIC_SCALE, ')'), '')
AS field
FROM INFORMATION_SCHEMA.COLUMNS
WHERE TABLE_NAME = '[table_name]'
ORDER BY ORDINAL_POSITION) AS T;
After updating the Table Type, the Data Export service started functioning properly once again! :)
When I tried to execute my stored procedure I had the same problem because the size of the column that I need to add some data is shorter than the data I want to add.
You can increase the size of the column data type or reduce the length of your data.
A 2016/2017 update will show you the bad value and column.
A new trace flag will swap the old error for a new 2628 error and will print out the column and offending value. Traceflag 460 is available in the latest cumulative update for 2016 and 2017:
https://support.microsoft.com/en-sg/help/4468101/optional-replacement-for-string-or-binary-data-would-be-truncated
Just make sure that after you've installed the CU that you enable the trace flag, either globally/permanently on the server:
...or with DBCC TRACEON:
https://learn.microsoft.com/en-us/sql/t-sql/database-console-commands/dbcc-traceon-trace-flags-transact-sql?view=sql-server-ver15
Another situation, in which this error may occur is in
SQL Server Management Studio. If you have "text" or "ntext" fields in your table,
no matter what kind of field you are updating (for example bit or integer).
Seems that the Studio does not load entire "ntext" fields and also updates ALL fields instead of the modified one.
To solve the problem, exclude "text" or "ntext" fields from the query in Management Studio
This Error Comes only When any of your field length is greater than the field length specified in sql server database table structure.
To overcome this issue you have to reduce the length of the field Value .
Or to increase the length of database table field .
If someone is encountering this error in a C# application, I have created a simple way of finding offending fields by:
Getting the column width of all the columns of a table where we're trying to make this insert/ update. (I'm getting this info directly from the database.)
Comparing the column widths to the width of the values we're trying to insert/ update.
Assumptions/ Limitations:
The column names of the table in the database match with the C# entity fields. For eg: If you have a column like this in database:
You need to have your Entity with the same column name:
public class SomeTable
{
// Other fields
public string SourceData { get; set; }
}
You're inserting/ updating 1 entity at a time. It'll be clearer in the demo code below. (If you're doing bulk inserts/ updates, you might want to either modify it or use some other solution.)
Step 1:
Get the column width of all the columns directly from the database:
// For this, I took help from Microsoft docs website:
// https://learn.microsoft.com/en-us/dotnet/api/system.data.sqlclient.sqlconnection.getschema?view=netframework-4.7.2#System_Data_SqlClient_SqlConnection_GetSchema_System_String_System_String___
private static Dictionary<string, int> GetColumnSizesOfTableFromDatabase(string tableName, string connectionString)
{
var columnSizes = new Dictionary<string, int>();
using (var connection = new SqlConnection(connectionString))
{
// Connect to the database then retrieve the schema information.
connection.Open();
// You can specify the Catalog, Schema, Table Name, Column Name to get the specified column(s).
// You can use four restrictions for Column, so you should create a 4 members array.
String[] columnRestrictions = new String[4];
// For the array, 0-member represents Catalog; 1-member represents Schema;
// 2-member represents Table Name; 3-member represents Column Name.
// Now we specify the Table_Name and Column_Name of the columns what we want to get schema information.
columnRestrictions[2] = tableName;
DataTable allColumnsSchemaTable = connection.GetSchema("Columns", columnRestrictions);
foreach (DataRow row in allColumnsSchemaTable.Rows)
{
var columnName = row.Field<string>("COLUMN_NAME");
//var dataType = row.Field<string>("DATA_TYPE");
var characterMaxLength = row.Field<int?>("CHARACTER_MAXIMUM_LENGTH");
// I'm only capturing columns whose Datatype is "varchar" or "char", i.e. their CHARACTER_MAXIMUM_LENGTH won't be null.
if(characterMaxLength != null)
{
columnSizes.Add(columnName, characterMaxLength.Value);
}
}
connection.Close();
}
return columnSizes;
}
Step 2:
Compare the column widths with the width of the values we're trying to insert/ update:
public static Dictionary<string, string> FindLongBinaryOrStringFields<T>(T entity, string connectionString)
{
var tableName = typeof(T).Name;
Dictionary<string, string> longFields = new Dictionary<string, string>();
var objectProperties = GetProperties(entity);
//var fieldNames = objectProperties.Select(p => p.Name).ToList();
var actualDatabaseColumnSizes = GetColumnSizesOfTableFromDatabase(tableName, connectionString);
foreach (var dbColumn in actualDatabaseColumnSizes)
{
var maxLengthOfThisColumn = dbColumn.Value;
var currentValueOfThisField = objectProperties.Where(f => f.Name == dbColumn.Key).First()?.GetValue(entity, null)?.ToString();
if (!string.IsNullOrEmpty(currentValueOfThisField) && currentValueOfThisField.Length > maxLengthOfThisColumn)
{
longFields.Add(dbColumn.Key, $"'{dbColumn.Key}' column cannot take the value of '{currentValueOfThisField}' because the max length it can take is {maxLengthOfThisColumn}.");
}
}
return longFields;
}
public static List<PropertyInfo> GetProperties<T>(T entity)
{
//The DeclaredOnly flag makes sure you only get properties of the object, not from the classes it derives from.
var properties = entity.GetType()
.GetProperties(System.Reflection.BindingFlags.Public
| System.Reflection.BindingFlags.Instance
| System.Reflection.BindingFlags.DeclaredOnly)
.ToList();
return properties;
}
Demo:
Let's say we're trying to insert someTableEntity of SomeTable class that is modeled in our app like so:
public class SomeTable
{
[Key]
public long TicketID { get; set; }
public string SourceData { get; set; }
}
And it's inside our SomeDbContext like so:
public class SomeDbContext : DbContext
{
public DbSet<SomeTable> SomeTables { get; set; }
}
This table in Db has SourceData field as varchar(16) like so:
Now we'll try to insert value that is longer than 16 characters into this field and capture this information:
public void SaveSomeTableEntity()
{
var connectionString = "server=SERVER_NAME;database=DB_NAME;User ID=SOME_ID;Password=SOME_PASSWORD;Connection Timeout=200";
using (var context = new SomeDbContext(connectionString))
{
var someTableEntity = new SomeTable()
{
SourceData = "Blah-Blah-Blah-Blah-Blah-Blah"
};
context.SomeTables.Add(someTableEntity);
try
{
context.SaveChanges();
}
catch (Exception ex)
{
if (ex.GetBaseException().Message == "String or binary data would be truncated.\r\nThe statement has been terminated.")
{
var badFieldsReport = "";
List<string> badFields = new List<string>();
// YOU GOT YOUR FIELDS RIGHT HERE:
var longFields = FindLongBinaryOrStringFields(someTableEntity, connectionString);
foreach (var longField in longFields)
{
badFields.Add(longField.Key);
badFieldsReport += longField.Value + "\n";
}
}
else
throw;
}
}
}
The badFieldsReport will have this value:
'SourceData' column cannot take the value of
'Blah-Blah-Blah-Blah-Blah-Blah' because the max length it can take is
16.
Kevin Pope's comment under the accepted answer was what I needed.
The problem, in my case, was that I had triggers defined on my table that would insert update/insert transactions into an audit table, but the audit table had a data type mismatch where a column with VARCHAR(MAX) in the original table was stored as VARCHAR(1) in the audit table, so my triggers were failing when I would insert anything greater than VARCHAR(1) in the original table column and I would get this error message.
I used a different tactic, fields that are allocated 8K in some places. Here only about 50/100 are used.
declare #NVPN_list as table
nvpn varchar(50)
,nvpn_revision varchar(5)
,nvpn_iteration INT
,mpn_lifecycle varchar(30)
,mfr varchar(100)
,mpn varchar(50)
,mpn_revision varchar(5)
,mpn_iteration INT
-- ...
) INSERT INTO #NVPN_LIST
SELECT left(nvpn ,50) as nvpn
,left(nvpn_revision ,10) as nvpn_revision
,nvpn_iteration
,left(mpn_lifecycle ,30)
,left(mfr ,100)
,left(mpn ,50)
,left(mpn_revision ,5)
,mpn_iteration
,left(mfr_order_num ,50)
FROM [DASHBOARD].[dbo].[mpnAttributes] (NOLOCK) mpna
I wanted speed, since I have 1M total records, and load 28K of them.
This error may be due to less field size than your entered data.
For e.g. if you have data type nvarchar(7) and if your value is 'aaaaddddf' then error is shown as:
string or binary data would be truncated
You simply can't beat SQL Server on this.
You can insert into a new table like this:
select foo, bar
into tmp_new_table_to_dispose_later
from my_table
and compare the table definition with the real table you want to insert the data into.
Sometime it's helpful sometimes it's not.
If you try inserting in the final/real table from that temporary table it may just work (due to data conversion working differently than SSMS for example).
Another alternative is to insert the data in chunks, instead of inserting everything immediately you insert with top 1000 and you repeat the process, till you find a chunk with an error. At least you have better visibility on what's not fitting into the table.