Advanced Data Access with ADO.NET and Oracle

int id = 1;
OracleBinary raw = null;
OracleBinary longRaw = null;

OracleConnection conn = new OracleConnection(CONNECTSTRING);
OracleCommand cmd = new OracleCommand(
"SELECT RawCol, LongRawCol FROM MyRawTable WHERE Id = " + id, conn);
conn.Open();

OracleDataReader dr = cmd.ExecuteReader();
if(dr.Read())
{
if(!dr.IsDBNull(0))
raw = dr.GetOracleBinary(0);

if(!dr.IsDBNull(1))
longRaw = dr.GetOracleBinary(1);
}

dr.Close();
conn.Close();

REF CURSOR

CREATE OR REPLACE PACKAGE GET_EMPLOYEES AS
TYPE T_CURSOR IS REF CURSOR;
PROCEDURE GetEmployees (cur_Employees OUT T_CURSOR);
END GET_EMPLOYEES;

CREATE OR REPLACE PACKAGE BODY GET_EMPLOYEES AS
PROCEDURE GetEmployees (cur_Employees OUT T_CURSOR)
IS
BEGIN
OPEN cur_Employees FOR
SELECT * FROM EMPLOYEES;
END GetEmployees;
END GET_EMPLOYEES;

// create connection
OracleConnection conn = new OracleConnection(CONNECTSTRING);

// create the command for the stored procedure
OracleCommand cmd = new OracleCommand();
cmd.Connection = conn;
cmd.CommandText = "GET_EMPLOYEES.GetEmployees";
cmd.CommandType = CommandType.StoredProcedure;

// add the REF CURSOR parameter to retrieve the result set
cmd.Parameters.Add("cur_Employees", OracleType.Cursor).Direction =
ParameterDirection.Output;

// open the connection and create the DataReader
conn.Open();
OracleDataReader dr = cmd.ExecuteReader();

// output the employee ID, name, and email (first four fields)
// and close the connection.
while(dr.Read())
{
for(int i = 0; i <= 3; i++)
Console.Write(dr[i].ToString() + ";");

Console.WriteLine();
}
conn.Close();

100;Steven;King;SKING;
101;Neena;Kochhar;NKOCHHAR;
102;Lex;De Haan;LDEHAAN;
103;Alexander;Hunold;AHUNOLD;
104;Bruce;Ernst;BERNST;

ROWID

OracleCommand cmd = conn.CreateCommand();
cmd.CommandText = "CREATE TABLE MyRowidTable (Id NUMBER, RowidCol ROWID,
UrowidCol UROWID)";
cmd.ExecuteNonQuery();

int id = 1;
OracleString rowId = null;

OracleConnection conn = new OracleConnection(CONNECTSTRING);
conn.Open();

// get the ROWID pseudocolumn value for the first row in HR.Employees
OracleCommand cmd =
new OracleCommand("SELECT ROWID FROM HR.Employees", conn);
OracleDataReader dr = cmd.ExecuteReader();

if(dr.Read())
rowId = dr.GetOracleString(0);

conn.Close();

// store the ROWID pseudocolumn value into the ROWID and UROWID
OracleDataAdapter da = new OracleDataAdapter("SELECT ID, RowidCol,
UrowidCol FROM MyRowidTable", CONNECTSTRING);
DataTable dt = new DataTable();
da.FillSchema(dt, SchemaType.Source);

OracleCommandBuilder cb = new OracleCommandBuilder(da);

DataRow row = dt.NewRow();
row["Id"] = id;
row["RowidCol"] = rowId;
row["UrowidCol"] = rowId;
dt.Rows.Add(row);

da.Update(dt);

int id = 1;
OracleString rowId = null;
OracleString urowId = null;

// get the ROWID and UROWID values
OracleConnection conn = new OracleConnection(CONNECTSTRING);
OracleCommand cmd = new OracleCommand("SELECT RowidCol, UrowidCol FROM
MyRowIdTable WHERE Id = " + id, conn);
conn.Open();

OracleDataReader dr = cmd.ExecuteReader();
if(dr.Read())
{
rowId = dr.GetOracleString(0);
urowId = dr.GetOracleString(1);

Console.WriteLine(rowId + "; " + urowId);
}

int employeeId;
string firstName;
string lastName;

// get the row from the EMPLOYEES table
cmd = new OracleCommand("SELECT * FROM Employees WHERE ROWID = '" +
rowId.Value + "'", conn);

dr = cmd.ExecuteReader();
if(dr.Read())
{
employeeId = dr.GetInt32(0);
firstName = dr.GetString(1);
lastName = dr.GetString(2);

Console.WriteLine(employeeId.ToString() + "; " + firstName + "; " +
lastName);
}

conn.Close();

AAAHM7AAFAAAABWAAA; AAAHM7AAFAAAABWAAA
100; Steven; King

Timestamp

SELECT tzname, tzabbrev FROM V$TIMEZONE_NAMES

OracleCommand cmd = conn.CreateCommand();
cmd.CommandText = "CREATE TABLE MyTimestampTable (Id NUMBER,
TimestampCol TIMESTAMP, TimeStampTZCol TIMESTAMP WITH TIME ZONE,
TimeStampLTZCol TIMESTAMP WITH LOCAL TIME ZONE)";
cmd.ExecuteNonQuery();

int id = 1;
DateTime timestampCol = DateTime.Now;
DateTime timestampTZCol = DateTime.Now;
DateTime timestampLTZCol = DateTime.Now;

OracleConnection conn = new OracleConnection(CONNECTSTRING);
conn.Open();

OracleCommand cmd = conn.CreateCommand();

cmd.CommandText = "INSERT INTO MyTimestampTable VALUES (" + id + ", '" +
timestampCol.ToString("dd MMM yyyy hh:mm:sstt") + "', '" +
timestampTZCol.ToString("dd MMM yyyy hh:mm:sstt") + "', '" +
timestampLTZCol.ToString("dd MMM yyyy hh:mm:sstt") + "')";

cmd.ExecuteNonQuery();

conn.Close();

int id = 1;
DateTime timestampCol;
DateTime timestampTZCol;
DateTime timestampLTZCol;

OracleConnection conn = new OracleConnection(CONNECTSTRING);
OracleCommand cmd = new OracleCommand("SELECT TimestampCol,
TimestampTZCol, TimestampLTZCol FROM MyTimestampTable WHERE Id = " +
id, conn);
conn.Open();

// get the Timestamp values
OracleDataReader dr = cmd.ExecuteReader();
if(dr.Read())
{
timestampCol = dr.GetDateTime(0);
timestampTZCol = dr.GetDateTime(1);
timestampLTZCol = dr.GetDateTime(2);

Console.WriteLine(timestampCol.ToString() + "; " +
timestampTZCol.ToString() + "; " +
timestampLTZCol.ToString());
}

dr.Close();
conn.Close();

7/9/2004 1:43:31 PM; 7/9/2004 1:43:31 PM; 7/9/2004 10:43:31 AM

UriType

OracleCommand cmd = conn.CreateCommand();
cmd.CommandText = "CREATE TABLE MyUritypeTable (Id NUMBER,
UriTypeCol SYS.URITYPE, HttpUriTypeCol SYS.HTTPURITYPE,
DBUriTypeCol SYS.DBURITYPE)";
cmd.ExecuteNonQuery();

int id = 1;

OracleConnection conn = new OracleConnection(CONNECTSTRING);
conn.Open();

OracleCommand cmd = conn.CreateCommand();
cmd.CommandText = "INSERT INTO MyUritypeTable VALUES (" + id +
", SYS.URIFACTORY.GETURI('http://msdn.microsoft.com/data/default.aspx?
pull=/library/en-us/dnadonet/html/msdnorsps.asp')" +
", SYS.HTTPURITYPE('msdn.microsoft.com/data/default.aspx?
pull=/library/en-us/dnadonet/html/msdnorsps.asp')" +
", SYS.DBURITYPE('/HR/EMPLOYEES/ROW[EMPLOYEE_ID=''100'']/EMAIL',
NULL))";
cmd.ExecuteNonQuery();

conn.Close();

int id = 1;
string uriTypeCol;
string httpUriTypeCol;
string dBUriTypeCol;
OracleLob httpUriTypeColClob;
OracleLob dBUriTypeColClob;

OracleConnection conn = new OracleConnection(CONNECTSTRING);
OracleCommand cmd = new OracleCommand("SELECT e.UriTypeCol.getUrl(),
e.HttpUriTypeCol.getUrl(), e.DBUriTypeCol.getUrl(),
e.HttpUriTypeCol.getClob(), e.DBUriTypeCol.getClob() FROM
HR.MyUritypeTable e WHERE Id = " + id, conn);
conn.Open();

OracleDataReader dr = cmd.ExecuteReader();
if(dr.Read())
{
// get the URIs
uriTypeCol = dr.GetString(0);
httpUriTypeCol = dr.GetString(1);
dBUriTypeCol = dr.GetString(2);

// get the HTML for the HTTPURITYPE column
httpUriTypeColBlob = dr.GetOracleLob(3);
// get the EMAIL value from HR.EMPLOYEES
dBUriTypeColClob = dr.GetOracleLob(4);

Console.WriteLine(uriTypeCol + "; " +
httpUriTypeCol + "; " + dBUriTypeCol +
"; HTTPURITYPE CLOB length = " + httpUriTypeColClob.Length +
"; " + dBUriTypeColClob.Value);
}

dr.Close();
conn.Close();

http://msdn.microsoft.com/data/default.aspx?pull=/library/en-us/dnadonet/html/msdnorsps.asp; http://msdn.microsoft.com/data/default.aspx?pull=/library/en-us/dnadonet/html/msdnorsps.asp; /ORADB/HR/EMPLOYEES/ROW[EMPLOYEE_ID='100']/EMAIL;
HTTPURITYPE CLOB length = 112964;
<?xml version="1.0"?><EMAIL>SKING</EMAIL>

User Defined

OracleCommand cmd = conn.CreateCommand();
cmd.CommandText = "CREATE OR REPLACE TYPE Employee_t
IS OBJECT (Name VARCHAR(50), YearsService INTEGER)";
cmd.ExecuteNonQuery();

OracleCommand cmd = conn.CreateCommand();
cmd.CommandText = "CREATE TABLE MyUserdefinedTable
(Id NUMBER, Employee HR.EMPLOYEE_T)";
cmd.ExecuteNonQuery();
The following code inserts a row into the table:
OracleConnection conn = new OracleConnection(CONNECTSTRING);
conn.Open();

OracleCommand cmd = conn.CreateCommand();

cmd.CommandText = "INSERT INTO MyUserdefinedTable VALUES
(1, EMPLOYEE_T('Bill Hamilton', 5))";
cmd.ExecuteNonQuery();

conn.Close();

int id = 1;
string employee_Name;
OracleNumber employee_YearsService;

OracleConnection conn = new OracleConnection(CONNECTSTRING);
OracleCommand cmd = new OracleCommand("SELECT Id, e.Employee.Name,
e.Employee.YearsService FROM MyUserdefinedTable e WHERE Id = " + id,
conn);
conn.Open();

OracleDataReader dr = cmd.ExecuteReader();
if(dr.Read())
{
id = dr.GetInt32(0);
employee_Name = dr.GetString(1);
employee_YearsService = dr.GetOracleNumber(2);

Console.WriteLine(id.ToString() + "; " + employee_Name + "; " +
employee_YearsService);
}

dr.Close();
conn.Close();

1; Bill Hamilton; 5

XmlType

OracleCommand cmd = conn.CreateCommand();
cmd.CommandText = "CREATE TABLE MyXmltypeTable (Id NUMBER,
XmlTypeCol SYS.XMLTYPE)";
cmd.ExecuteNonQuery();

int id = 1;
string xmltypeCol = @"<?xml version=""1.0""?><EMAIL>SKING</EMAIL>";

OracleConnection conn = new OracleConnection(CONNECTSTRING);
conn.Open();

OracleCommand cmd = conn.CreateCommand();
cmd.CommandText = "INSERT INTO MyXmltypeTable VALUES (" + id +
", SYS.XMLTYPE.CREATEXML('" + xmltypeCol + "'))";
cmd.ExecuteNonQuery();

conn.Close();

int id = 1;
string xmltypeCol;

OracleConnection conn = new OracleConnection(CONNECTSTRING);
OracleCommand cmd = new OracleCommand(
"SELECT SYS.XMLTYPE.GETSTRINGVAL(xmltypeCol) FROM MyXmltypeTable WHERE
Id = " + id, conn);
conn.Open();

OracleDataReader dr = cmd.ExecuteReader();
if(dr.Read())
{
xmltypeCol = dr.GetString(0);

Console.WriteLine(xmltypeCol);
}

dr.Close();
conn.Close();

<?xml version="1.0"?><EMAIL>SKING</EMAIL>

Conclusion

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