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Showing content from https://learn.microsoft.com/en-us/dotnet/api/system.data.oracleclient.oracleparameter below:

OracleParameter Class (System.Data.OracleClient) | Microsoft Learn

Represents a parameter to an OracleCommand and optionally its mapping to a DataColumn. This class cannot be inherited.

public ref class OracleParameter sealed : MarshalByRefObject, ICloneable, System::Data::IDbDataParameter

public ref class OracleParameter sealed : System::Data::Common::DbParameter, ICloneable

[System.ComponentModel.TypeConverter(typeof(System.Data.OracleClient.OracleParameter+OracleParameterConverter))]
public sealed class OracleParameter : MarshalByRefObject, ICloneable, System.Data.IDbDataParameter

[System.ComponentModel.TypeConverter(typeof(System.Data.OracleClient.OracleParameter+OracleParameterConverter))]
public sealed class OracleParameter : System.Data.Common.DbParameter, ICloneable

[<System.ComponentModel.TypeConverter(typeof(System.Data.OracleClient.OracleParameter+OracleParameterConverter))>]
type OracleParameter = class
    inherit MarshalByRefObject
    interface IDbDataParameter
    interface IDataParameter
    interface ICloneable

[<System.ComponentModel.TypeConverter(typeof(System.Data.OracleClient.OracleParameter+OracleParameterConverter))>]
type OracleParameter = class
    inherit DbParameter
    interface ICloneable
    interface IDbDataParameter
    interface IDataParameter

Public NotInheritable Class OracleParameter
Inherits MarshalByRefObject
Implements ICloneable, IDbDataParameter

Public NotInheritable Class OracleParameter
Inherits DbParameter
Implements ICloneable

Inheritance

Inheritance

Attributes

Implements

The following example creates multiple instances of OracleParameter through the OracleParameterCollection within the OracleDataAdapter. These parameters are used to select data from the database and place the data in the DataSet. This example assumes that a DataSet and an OracleDataAdapter have already been created by using the appropriate schema, commands, and connection.

public void AddOracleParameters()
 {
 // ...
 // create dataSet and adapter
 // ...
   adapter.SelectCommand.Parameters.Add("pEName", OracleType.VarChar, 80).Value = "Smith";
   adapter.SelectCommand.Parameters.Add("pEmpNo", OracleType.Int32).Value = 7369;
   adapter.Fill(dataSet);
 }

Public Sub AddOracleParameters()
    ' ...
    ' create dataSet and adapter
    ' ...
adapter.SelectCommand.Parameters.Add("pEName", OracleType.VarChar, 80).Value = "Smith"
adapter.SelectCommand.Parameters.Add("pEmpNo", OracleType.Int32).Value = 7369
adapter.Fill(dataSet)
End Sub

Parameter names are not case-sensitive.

When querying an Oracle database using the Microsoft OLE DB Provider for Oracle (MSDAORA) and the ODBC.NET Framework Data Provider, using the LIKE clause to query values in fixed-length fields may not return all expected matches. The reason is that when Oracle matches values for fixed-length fields in a LIKE clause, it matches the entire length of the string, including any padding trailing spaces. For example, if a table in an Oracle database contains a field named "Field1" that is defined as char(3), and you enter the value "a" into a row of that table, the following code will not return the row.

Dim queryString As String = "SELECT * FROM Table1 WHERE Field1 LIKE ?"
Dim command As OleDbCommand = New OleDbCommand(queryString, connection)
command.Parameters.Add("@p1", OleDbType.Char, 3).Value = "a"
Dim reader As OleDbDataReader = command.ExecuteReader()

string queryString = "SELECT * FROM Table1 WHERE Field1 LIKE ?";
OleDbCommand command = new OleDbCommand(queryString, connection);
command.Parameters.Add("@p1", OleDbType.Char, 3).Value = "a";
OleDbDataReader reader = command.ExecuteReader();

This is because Oracle stores the column value as "a " (padding "a", with trailing spaces, to the fixed field length of 3), which Oracle does not treat as a match for the parameter value of "a" in the case of a LIKE comparison of fixed-length fields.

To resolve this problem, append a percentage ("%") wildcard character to the parameter value ("a%"), or use an SQL = comparison instead.

Initializes a new instance of the OracleParameter class.

Initializes a new instance of the OracleParameter class that uses the parameter name and an OracleParameter object.

Initializes a new instance of the OracleParameter class that uses the parameter name, data type, length, source column name, parameter direction, numeric precision, and other properties.

Initializes a new instance of the OracleParameter class that uses the parameter name, data type, size, direction, source column, source version, and other properties.

Initializes a new instance of the OracleParameter class that uses the parameter name, data type, length, and source column name.

Initializes a new instance of the OracleParameter class that uses the parameter name, data type, and length.

Initializes a new instance of the OracleParameter class that uses the parameter name and data type.

Gets or sets the DbType of the parameter.

Gets or sets a value that indicates whether the parameter is input-only, output-only, bidirectional, or a stored procedure return value parameter.

Gets or sets a value that indicates whether the parameter accepts null values.

Gets or sets the offset to the Value property.

Gets or sets the OracleType of the parameter.

Gets or sets the name of the OracleParameter.

Obsolete.

Gets or sets the maximum number of digits used to represent the Value property.

Obsolete.

Gets or sets the number of decimal places to which Value is resolved.

Gets or sets the maximum size, in bytes, of the data within the column.

Gets or sets the name of the source column mapped to the DataSet and used for loading or returning the Value.

Gets or sets a value that indicates whether the source column is nullable. This allows OracleCommandBuilder to correctly generate Update statements for nullable columns.

Gets or sets the DataRowVersion to use when you load Value.

Gets or sets the value of the parameter.

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