I'm trying to implement a simple search, using LIKE in my SQL statement:
Using cmd As New OracleCommand
cmd.Connection = conn
cmd.CommandType = CommandType.Text
cmd.CommandText = "select * from TABLE where FIELD like '%:text%'"
cmd.Parameters.AddWithValue("text", searchValue)
...
End Using
This doesn't work - what is the best way to parameterize the search value?
select * from TABLE where FIELD like ('%' || :text || '%')
update: my bad, if you are using oracle driver, see this link for help. this depends on which driver you use for db access, in case of oledb you need to do following
here is corrected code:
Using cmd As New OracleCommand
cmd.Connection = conn
cmd.CommandType = CommandType.Text
cmd.CommandText = "select * from TABLE where FIELD like ?"
cmd.Parameters.AddWithValue("#text", '%'+searchValue+'%')
...
End Using
in case of oracle driver you need to do following:
Using cmd As New OracleCommand
cmd.Connection = conn
cmd.CommandType = CommandType.Text
cmd.CommandText = "select * from TABLE where FIELD like :text"
cmd.Parameters.AddWithValue(":text", '%'+searchValue+'%')
...
End Using
In cases like this I prefer this syntax:
select * from TABLE where INSTR(FIELD, :text) > 0
Related
When I execute the following code the value dr.HasRows is false, and dr.Read() returns false. The same query running in SQL Developer returns 10 rows:
var allTablesSql = "select * from all_tables where table_name = 'ADDFIELDSPIPES'";
var cmd = new OracleCommand(allTablesSql, conn);
cmd.CommandType = CommandType.Text;
var dr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
if (dr.Read())
{
// We have rows!
}
If I change my query to be as follows then dr.HasRows is true and dr.Read() returns true:
var allTablesSql = "select * from all_tables where table_name like '%'";
I suspect that ODP.NET somewhere and somehow queries metadata before executing the SQL string that I supply, and this metadata query somehow prevents ODP.NET from returning any rows for my query.
I have this query:
SELECT
case
when
AddressType IN (select code.codeid from code where code.codeset = AddressTypeCodeSet and code.description like 'Postal%')
then 'PostalAddress'
when
AddressType IN (select code.codeid from code where code.codeset = AddressTypeCodeSet and code.description like 'Email%')
then
'EmailAddress'
else
'OtherAddress'
end as AddressType
FROM VW_Address
WHERE AddressId=190000;
When I execute this query using SQL Developer, the result returned is OtherAddress. This is what I'm expecting. However, when I execute the same query via this code:
Dim cmd =
New Oracle.DataAccess.Client.OracleCommand(["SQL HERE]")
cmd.Parameters.Add(":p0", OracleDbType.Int32)
cmd.Parameters(0).Value = 190000
cmd.BindByName = True
Dim r = cmd.ExecuteReader()
I get a different result: EmailAddress
ODP is version 2.111.7.20, Oracle is 11g.
In oracle we using select * from table_name where column_name=&value in similar way how to use ampersand in JDBC?
stmt = conn.createStatement();
String sql;
sql="select emp_name from employees"+" where emp_no=?";
ResultSet rs=stmt.executeQuery(sql);
while(rs.next()){
String emp_name=rs.getString("emp_name");
System.out.println(emp_name);
}
i wrote the above code but it is not working(showing error)
Did you read the article I provided the link to?
You use the question mark ? to point out places in your query where you want to specify a parameter, and you have to use PreparedStatement. I can't test it, but it should be something like this:
// some code to obtain the Connection object
PreparedStatement stmt = null;
String yourQuery = " SELECT emp_name FROM employees WHERE emp_no = ? ";
try {
stmt = conn.prepareStatement(yourQuery);
stmt.setLong(1, 252);
ResultSet rs = stmt.executeQuery();
while(rs.next()) {
String emp_name = rs.getString("emp_name");
System.out.println(emp_name);
}
} finally {
// close the stmt etc.
}
I'd suggest using a PreparedStatement - from memory it's something like
Connection conn = getConnection();
PreparedStatement pstmnt = conn.prepareStatement("Select * from employees where emp_no =?");
pstmnt.setLong(1,emp_no);
ResultSet rs = pstmnt.executeQuery();
but the link that #Przemyslaw Kruglej high light above will almost certainly have a good example ( I haven;t read it though ... )
I am reading data from Oracle database by using ODP.Net with the follwing code
OracleConnection con = new OracleConnection(connectionString);
OracleCommand cmd = new OracleCommand( SELECT ID,RECORD(XMLType) FROM tbl_Name, con);
con.Open();
OracleDataReader _dataReader = cmd.ExecuteReader();
while (_dataReader.Read())
{
string rowId = _dataReader[0].ToString();
string xmlString = _dataReader[1].ToString();
adding this data into Queue for further processing
}
It working fine but in a minute it's reading only 10000 record. If I use SqlServer database it's reading 500000 record in minute having table with same schema.
Please help me if I am missing something to read data faster using ODP.NET
Thank you.
**
ANSWER:
**
I have tried with GetClobVal() and GetString Val() functions, now it is working fine.
select t.RECID, t.XMLRECORD.GetClobVal() from tableName t"
select x.RECID,x.XMLRECORD.getStringVal() from tableName x"
If we use these queries with oracle command it will run fast, but not as fast as sql server query.
I'm new to working with bound variables, so I've got a small question -
I'm using an Oracle DB and ODP.NET in a .NET app, and I'm using bound variables like this
string sql = "select * from table1 where loc=:pLoc and pno=:pPno and sno=:pSno union all select * from table2 where loc=:pLoc and pno=:pPno and sno=:pSno union all
select * from table3 where loc=:pLoc and pno=:pPno and sno=:pSno";
OracleCommand _cmd = new OracleCommand(sql, DBFacade.DbConnection);
OracleParameter pLoc = new OracleParameter(":pLoc", OracleDbType.Varchar2, 3);
pLoc.Value = loc;
OracleParameter pSno = new OracleParameter(":pSno", OracleDbType.Varchar2, 10);
pLoc.Value = sno;
OracleParameter pPno = new OracleParameter(":pPno", OracleDbType.Varchar2, 18);
pLoc.Value = pno;
_cmd.Parameters.Add(pLoc);
_cmd.Parameters.Add(pSno);
_cmd.Parameters.Add(pPno);
_odaContractPrices.SelectCommand = _cmd;
I've used bound variables successfully in other sql statements (in simpler queries like "select * from table1 where column1=:param1 and column2=:param2"), but for some reason in this one it doesn't work. Can anyone explain me why ?
Thank you very much!
I'm not sure it's the source of the error but try to remove the : in the OracleParameter constructor and use
_cmd.BindByName = true;
Actually, I think that in your case, the following will suffice:
_cmd.Parameters.Add("pLoc", loc);
_cmd.Parameters.Add("pSno", sno);
_cmd.Parameters.Add("pPno ", pno);