I have created the table in apache ignite like below.
Create table test (id number, value decimal(4,1), primary key(id)
So the value column should have a precision of 4 and a scale of 1. So whatever data I will insert into the table like 1234.1234, it should trim it to 1234.1. Because my table definition for the column value is decimal(4,1).
But it is not working as expected.
I am using apache ignite version 2.7.5.
Please let me know if I am doing anything wrong.
You need to declare value as decimal(5,1) and use the round function when inserting
insert into test(1, round(1234.1234,1))
https://apacheignite-sql.readme.io/docs/round
In your example:
Ignite converts 1234.1234 into a BigDecimal and validates against specified precisions.
Here prop.precision() would equal 4 and prop.scale() equals 1
BigDecimal dec = (BigDecimal)propVal; //propVal is the value i.e. 1234.1234 in your case
if (dec.precision() > prop.precision()) { //prop are the precisions you specified i.e. (4,1) in your case
throw new IgniteSQLException("Value for a column '" + prop.name() + "' is out of range. " +
"Maximum precision: " + prop.precision() + ", actual precision: " + dec.precision(),
isKey ? TOO_LONG_KEY : TOO_LONG_VALUE);
}
else if (prop.scale() != -1 &&
dec.scale() > prop.scale()) {
throw new IgniteSQLException("Value for a column '" + prop.name() + "' is out of range. " +
"Maximum scale : " + prop.scale() + ", actual scale: " + dec.scale(),
isKey ? KEY_SCALE_OUT_OF_RANGE : VALUE_SCALE_OUT_OF_RANGE);
}
Related
I have about 20 columns in one row and not all columns are required to be filled in when row created also i dont want to cardcode name of every column in SQL query and on http.post request on frontend. All values are from form. My code:
var colNames, values []string
for k, v := range formData {
colNames = append(colNames, k)
values = append(values, v)
}
Now i have 2 arrays: one with column names and second with values to be inserted. I want to do something like this:
db.Query("insert into views (?,?,?,?,?,?) values (?,?,?,?,?,?)", colNames..., values...)
or like this:
db.Query("insert into views " + colNames + " values" + values)
Any suggestions?
Thanks!
I assume your code examples are just pseudo code but I'll state the obvious just in case.
db.Query("insert into views (?,?,?,?,?,?) values (?,?,?,?,?,?)", colNames..., values...)
This is invalid Go since you can only "unpack" the last argument to a function, and also invalid MySQL since you cannot use placeholders (?) for column names.
db.Query("insert into views " + colNames + " values" + values)
This is also invalid Go since you cannot concatenate strings with slices.
You could fromat the slices into strings that look like this:
colNamesString := "(col1, col2, col3)"
valuesString := "(val1, val2, val3)"
and now your second code example becomes valid Go and would compile but don't do this. If you do this your app becomes vulnerable to SQL injection and that's something you definitely don't want.
Instead do something like this:
// this can be a package level global and you'll need
// one for each table. Keep in mind that Go maps that
// are only read from are safe for concurrent use.
var validColNames = map[string]bool{
"col1": true,
"col2": true,
"col3": true,
// ...
}
// ...
var colNames, values []string
var phs string // placeholders for values
for k, v := range formData {
// check that column is valid
if !validColNames[k] {
return ErrBadColName
}
colNames = append(colNames, k)
values = append(values, v)
phs += "?,"
}
if len(phs) > 0 {
phs = phs[:len(phs)-1] // drop the last comma
}
phs = "(" + phs + ")"
colNamesString := "(" + strings.Join(colNames, ",") + ")"
query := "insert into views " + colNamesString + phs
db.Query(query, values...)
I'm trying to search the max ID in the database, then increment it by 1 for each new entry as shown below:
var query2 = dbb.Database.SqlQuery<patient_visit>("SELECT MAX(CAST(SUBSTRING(pvid, 3, 10) AS int)) FROM patient_visit");
if (query2 != null)
{
objDetails.pvid = query2.ToString();
objDetails.pvid += 1;
objDetails.pvid = "PV" + objDetails.pvid;
}
string sql = "INSERT INTO patient_visit (pvid,paid) " +
"VALUES('" + objDetails.pvid + "', '" + paid + "')";
But when i try to insert it in the database, it gives out error
An exception of type 'System.Data.SqlClient.SqlException' occurred in EntityFramework.SqlServer.dll but was not handled in user code
Additional information: String or binary data would be truncated.
I've tried running the query in SQL Server and checked the value of 'pvid', it is 10 so after i include 'PV' to the integer pvid, it should be 12. So it should be fine, but why did i get that error? Please can anyone help me?
[Key]
[MaxLength(20), MinLength(12)]
public string pvid { get; set; }
When i replace the pvid with hard code ID, it works just fine. Why is this happening?
P/S: I know its not advisable to simply concatenate the input data with the query, but i've also tried querying using parameterized query but it gives same error.
string sql = "INSERT INTO patient_visit (pvid,paid) " +
"VALUES(#pvid, #paid)";
List<SqlParameter> parameterList = new List<SqlParameter>();
parameterList.Add(new SqlParameter("#pvid", objDetails.pvid));
parameterList.Add(new SqlParameter("#paid", paid));
SqlParameter[] parameters = parameterList.ToArray();
dbb.Database.ExecuteSqlCommand(sql, parameters);
Check the Field length of the column you are trying to put the data into.
I have had this problem before where the column was varchar(10) and I was trying to concatenate two char strings of 6 characters each. Making them 12 characters long. 2 longer than the target field.
Your problem might be similar.
I'm trying to write function for selecting optional columns in linq(columns that may not exist). The problem is in linq like this:
using (DataDataContext db = new DataDataContext()){
var collection = from t in table
select new
{
Nonoptional = t.A;
Optional = IsInDB("table","B") ? t.B : -1; //this is optional column
}}
Unfortunately, this won't work because the fragment near Optional will be translated to case statement and error arises that column not exists.
So i decided to "cover" it with function:
using (DataDataContext db = new DataDataContext()){
var collection = from t in table
select new
{
Nonoptional = t.A;
Optional = IsInDB("table","B") ? OptionalColumnValue<int>("table","B","id_table",t.id_table) : -1; //this is optional column
}}
I want this function to be universal. It should work like that" If there is no value or column is nullable and value is null then return default value for type.
I came up with something like this:
//table,column - obvious,id_column - PK column of table, id - id of currently processing record
public static T OptionalColumnValue<T>(string table,string column,string id_columm,int id) T t = default(T);
DataDataContext db = new DataDataContext();
IEnumerable<object> value = db.ExecuteQuery<object>("select " + column + " from " + table + " where " + id_columm + " = " + id.ToString());
List<object> valueList = value.ToList();
if (valueList.Count == 1)//here is the problem
t = (T)valueList.First();
return t;
}
When there is null value db.ExecuteQuery return something like object{}. I'm assuming this is "empty" object,with nothing really in there. I was thinking about checking for "emptiness" of this object( BTW this is not DBull).
When i realised that this is no way either with concrete value in this column(it cannot cast it to return correct type), then I tried db.ExecuteQuery<T>. Then concrete value - OK, null - Exception.
I thought, maybe Nullable<T> as return value. Nop, because string also can be T.
I don't know what to do next. Maybe there's another solution to this problem.
I face problem for inserting value in Cassandra database.
Please suggest me some code for inserting value in database
var empRecord = new EmployeeEntity()
{
employeeid=2,
age=23,
employeename=txtName.Text,
salary=5001
};
var employeeRecord = new CassandraEntity<List<Column>>().SetColumnFamily(columnFamily).SetKey(empRecord.employeeid).SetData(empRecord);
ctx.ColumnList.InsertOnSubmit(employeeRecord);
ctx.SubmitChanges();
i getting error for inserting value in Cassandra database
Error like -> Not enough bytes to read value of component 0
How to solve it
I'm not sure which driver you are trying to use, but this works with the DataStax C# CQL3 driver.
First, connect to Cassandra and get your session:
cluster = Cluster.Builder().WithCredentials(_user, _password).AddContactPoint(_node).Build();
Session session = cluster.Connect();
Then, insert data using the following:
String strCQL1 = "UPDATE yourKeyspaceName.employee SET age=?, "
+ "employeename=?, Salary=? "
+ "WHERE employeeid=?";
PreparedStatement statement = session.Prepare(strCQL1);
BoundStatement boundStatement = new BoundStatement(statement);
boundStatement.Bind(age, txtName.Text, salary, empRecord.employeeid);
session.Execute(boundStatement);
In this case, Cassandra will perform an "UPSERT," inserting the data if it does not exist and updating if it does. Just make sure that your primary key(s) are in the WHERE clause.
Try This solution ,
string query = " insert into employee (employeeid,age,employeename,salary) values (" + txtId.Text + ",31,'" + strNameHex.Trim() + "'," + myHexNumber + ")";
txtQuery.Text = query;
context.ExecuteNonQuery(query);
context.SaveChanges();
It's help you
I've looked around everywhere, but I can't seem to find exactly what I'm trying to do. It should be fairly simple...
I have a db table set up like this:
var db = Ti.Database.open('playerInfo.db');
db.execute('CREATE TABLE IF NOT EXISTS playersTable (id INTEGER PRIMARY KEY, name TEXT NOT NULL, "50" INTEGER, "25" INTEGER )');
I have two buttons with an assigned value of 25, and 50, respectively. Each button has a "value" key, where I assign their values. I am trying to accomplish three things:
When a button is pressed, find the column of corresponding value.
increase the value of this column by 1.
Retrieve the new value and console log it.
This is what my code looks like when a button is pressed:
var rows = db.execute("SELECT '" + button.value + "' FROM playersTable WHERE name= '" + owner + "'");
var imagesString = rows.fieldByName(button.value);
Ti.API.debug(imagesString)
This is all in a click event listener where the variable "owner" is passed in as a string.
This is the error I get:
message = "Attempted to access unknown result column 25";
I don't have too much experience with sql, so I'm not sure what I'm doing right and what I'm doing wrong. Any help is appreciated!
Thanks.
I'm not sure quite exactly what the problem is, but the following works for me. Note that the "?" variable substitution syntax makes sure that the values are quoted properly for MySQL:
button = e.source;
db = Titanium.Database.open('test');
var rows = db.execute("SELECT * FROM playersTable WHERE name= ?", "foo");
// Theoretically this should be returning a single row. For other results,
// we would loop through the result set using result.next, but here just check if
// we got a valid row.
if (rows.isValidRow()) {
var imagesString = rows.fieldByName(button.value);
var id = rows.fieldByName('id');
imagesString = imagesString + 1;
Ti.API.info("id = " + id + " val = " + imagesString);
// The ? substitution syntax doesn't work for column names, so we
// still need to stick the button value into the query string.
db.execute('UPDATE playersTable set "' + button.value +'"= ? where id = ?', imagesString, id);
}
else
{
Ti.API.info("Row not found.");
}
db.close();
If you get the row not found error, it's possible your data isn't getting inserted properly in the first place. Here's how I inserted my test row for player "foo":
db.execute('insert into playersTable (name, "50", "25") values (?,?,?)', 'foo', 0, 0);
I think this should solve your problem. Let me know if this doesn't work for you.