I want to retrieve multiple row from oracle 10g tables through JSP using prepare statement.
The following JSP code creates a prepared statement:
String myquery = "SELECT * FROM EMPLOYEES WHERE DEPARTMENT = ?";
PreparedStatement mystatement = connection.prepareStatement(myquery);
The first line stores the SQL statement in a string variable called myquery , with a question mark ( ? ) serving as a placeholder for the SQL variable value. The second line creates a prepared statement object called mystatement .
Next, you assign a value to the SQL variable, as follows:
mystatement.setString(1, request.getParameter("myURLparam"));
The setString method assigns the value to the variable and takes two arguments. The first argument specifies the affected variable by its position (here, the first position in the SQL statement). The second argument specifies the variable's value. In this example, the value is provided by a URL parameter passed to the page.
Note: You must use different methods to assign non-string values to SQL variables. For example, to assign an integer to the variable, you would use the mystatement.setInt() method.
Finally, you generate the recordset, as follows:
ResultSet myresults = mystatement.execute();
Please find the sample code below from the below link http://oracle.ittoolbox.com/groups/technical-functional/oracle-apps-l/how-to-connect-to-database-in-jsp-using-jdbc-drivers-to-oracle-database-1569382
<%# page import="java.io.*, java.util.*, java.sql.*"%>
<%# page import="oracle.jdbc.driver.OracleConnection" %>
<%
OracleConnection conn1 = null;
ResultSet getCountRs = null;
PreparedStatement getCountStmt = null;
try{
conn1 = (OracleConnection)TransactionScope.getConnection();
getCountStmt = conn1.prepareStatement("SELECT
PROMPT,FUNCTION_ID,SUB_MENU_ID FROM FND_MENU_ENTRIES_VL WHERE MENU_ID
=:1 and prompt is not null");
getCountStmt.setInt(1,pMenuid);
getCountRs = getCountStmt.executeQuery();
while(getCountRs.next())
{
prompt[x]=getCountRs.getString(1);
function_id[x]=getCountRs.getInt(2);
submenu_id[x]=getCountRs.getInt(3);
x++;
}
}
catch(exception e) {}
%>
Related
The requirement is :-
The application will run dynamic SQLs and show the results in table format in JSP. The SQL passed to the application will change, which means the number, name, datatype of selected columns will change and so the result set will also change. The SQL is stored in a config.properties file, everytime we need to run a different SQL, we will just change the SQL in config.properties file. After the SQL is executed, from the ResultSet's Metadata object I have retrieved the column names and column datatypes by :-
ResultSetMetaData rsmd = rs.getMetaData(); // rs is the ResultSet
HashMap<String , String> hmap = new LinkedHashMap<String , String>();
for(int i=1;i<=rsmd.getColumnCount();i++)
{
hmap.put(rsmd.getColumnName(i), rsmd.getColumnTypeName(i));
}
hmap.entrySet().forEach(entry ->{System.out.println(entry.getKey() + " : " + entry.getValue());});
Output :-
TRADER : VARCHAR2
TRAN_NUM : NUMBER
STARTTIME : DATE
ERROR_DETAILS : CLOB
In JDBC, we have specific methods eg. rs.getString(columnName), rs.getInt(columnIndex), rs.getTimestamp(), rs.getClob() to get data of different data types. But in this scenario everything is dynamic, as columnName and columnDatatype will change everytime.
The ResultSet contains around 2000 rows.
How to write the logic, to check the column's datatype and apply the correct rs.getXXX() method to retrieve the ResultSet's data dynamically ?
Thanks & Regards
Saswata Mandal
I am able to do it by :-
while(rs.next())
{
JsonObject jsonRow = new JsonObject();
for(String colName : ResultSetColumnNames)
{
jsonRow.addProperty(colName, rs.getObject(colName)==null ? "NULL": rs.getObject(colName).toString());
}
jsonArry.add(jsonRow);
}
Thanks and Regards
Saswata Mandal
I've got a table in my Google Cloud SQL database with an auto-incrementing column.
How do I execute an INSERT query via google-apps-script/JDBC and get back the value for the newly incremented column?
For example, my column is named ticket_id. I want to INSERT and have the new ticket_id value be returned in the result set.
In other words, if I have the following structure, what would I need to modify or how, so that I can do something like rs = stmt.getGeneratedKeys();
var conn = Jdbc.getCloudSqlConnection("jdbc:google:rdbms:.......
var stmt = conn.createStatement();
//build my INSERT sql statement
var sql = "insert into ......
var rs = stmt.executeUpdate(sql);
I see that there is a JDBC statement class with a member called RETURN_GENERATED_KEYS but I have so far not been smart enough to figure out how to properly manipulate that and get what I need. Is RETURN_GENERATED_KEYS a constant, is it an attribute, or how can I make use of it?
It seems like the documentation with the Apps Script JDBC service is a bit lacking. I've created an internal task item for that. Thankfully, Apps Script JDBC API follows the Java JDBC API pretty closely. The key is to get the result set back using the stmt.getGeneratedKeys() call.
I built a sample table using the animals example from the MySQL docs and this sample below works nicely against that and logs the next incremented ID.
function foo() {
var conn = Jdbc.getCloudSqlConnection("jdbc:google:rdbms://<instance>/<db>");
var stmt = conn.createStatement();
var sql = "INSERT INTO animals (name) VALUES ('dog')";
var count = stmt.executeUpdate(sql,1)//pass in any int for auto inc IDs back
var rs = stmt.getGeneratedKeys();
//if you are only expecting one row back, no need for while loop
// just do rs.next();
while(rs.next()) {
Logger.log(rs.getString(1));
}
rs.close();
stmt.close();
conn.close();
}
public ResultSet readSubSet(int No, String name, String case) throws SQLException {
preparedStatement = connect.prepareStatement("SELECT * FROM target WHERE myName=? AND myCase=? LIMIT ?,10");
preparedStatement.setString(8, name);
preparedStatement.setString(6, case);
preparedStatement.setInt(1, No);
resultSet = preparedStatement.executeQuery();
return resultSet;
}
After run I got: java.sql.SQLException: Parameter index out of range (8 > number of parameters, which is 2).
my table define myName and myCase is TEXT, is that ok I use prepareStatement.setString
When you call setString you pass in two arguments, the first is the index of the parameter you are filling in and the second is the value you are filling it with. In your case, you would want prepareStatement.setString(1,name); to fill in the 1st parameter, prepareStatement.setString(2,case); to fill in the 2nd parameter, and so on.
In your SQL you only have 3 variables and you are setting variable 8 as name in preparedStatement.setString(8, name)...
Look # http://download.oracle.com/javase/tutorial/jdbc/basics/prepared.html#supply_values_ps
I am trying to execute a user-defined Oracle function that returns a RefCursor using ODP.NET. Here is the function:
CREATE OR REPLACE FUNCTION PKG.FUNC_TEST (ID IN TABLE.ID%type)
RETURN SYS_REFCURSOR
AS
REF_TEST SYS_REFCURSOR;
BEGIN
OPEN REF_TEST FOR
SELECT *
FROM TABLE;
RETURN REF_TEST;
END;
/
I can call this function in Toad (select func_test(7) from dual) and get back a CURSOR. But I need to get the cursor using C# and ODP.NET to fill a DataSet, but I keep getting a NullReferenceException - "Object reference not set to an instance of an object". Here is what I have for that:
OracleConnection oracleCon = new OracleConnection(ConfigurationManager.ConnectionStrings["MyConnectionString"].ConnectionString);
OracleCommand sqlCom = new OracleCommand("select func_test(7) from dual", oracleCon);
sqlCom.Parameters.Add("REF_TEST", OracleDbType.RefCursor, ParameterDirection.ReturnValue);
OracleDataAdapter dataAdapter = new OracleDataAdapter();
dataAdapter.SelectCommand = sqlCom;
DataSet dataSet = new DataSet();
dataAdapter.Fill(dataSet); //FAILS HERE with NullReferenceException
I was able to find lots of info and samples on using stored procedures and ODP.NET, but not so much for returning RefCursors from functions.
EDIT: I do not want to explicitly add input parameters to the OracleCommand object (i.e. sqlCom.Parameters.Add("id", OracleDbType.Int32,ParameterDirection.Input).Value = 7;) as that makes it difficult to implement this as a generic RESTful web service, but I'm reserving it as my last resort but would use stored procedures instead.
Any help is much appreciated!
I think you are missing the sqlCom.ExecuteNonQuery();
also, instead of running the select func_test(7) from dual; lets switch it to run the function and pass in the param
OracleConnection oracleCon = new OracleConnection(ConfigurationManager.ConnectionStrings["MyConnectionString"].ConnectionString);
// Set the command
string anonymous_block = "begin " +
" :refcursor1 := func_test(7) ;" +
"end;";
//fill in your function and variables via the above example
OracleCommand sqlCom= con.CreateCommand();
sqlCom.CommandText = anonymous_block;
// Bind
sqlCom.Parameters.Add("refcursor1", OracleDbType.RefCursor);
sqlCom.Parameters[0].Direction = ParameterDirection.ReturnValue;
try
{
// Execute command; Have the parameters populated
sqlCom.ExecuteNonQuery();
// Create the OracleDataAdapter
OracleDataAdapter da = new OracleDataAdapter(sqlCom);
// Populate a DataSet with refcursor1.
DataSet ds = new DataSet();
da.Fill(ds, "refcursor1", (OracleRefCursor)(sqlCom.Parameters["refcursor1"].Value));
// Print out the field count the REF Cursor
Console.WriteLine("Field count: " + ds.Tables["refcursor1"].Columns.Count);
}
catch (Exception e)
{
Console.WriteLine("Error: {0}", e.Message);
}
finally
{
// Dispose OracleCommand object
cmd.Dispose();
// Close and Dispose OracleConnection object
con.Close();
con.Dispose();}
this is based on the example ODP that can be found # %ora_home%\Client_1\ODP.NET\samples\RefCursor\Sample5.csproj
If you want to avoid (for better or worst!) the custom built param collection for each proc/function call you can get around that by utilizing anonymous blocks in your code, I have ammended (once again untested!) the code above to reflect this technique.
Here is a nice blog (from none other than Mark Williams) showing this technique.
http://oradim.blogspot.com/2007/04/odpnet-tip-anonymous-plsql-and.html
I'm trying to map OleDb parameters to an Oracle Function. I was able to do this using the System.Data.Oracle namespace but then found that this is depricated, so I thought i would re-write it as OldDb to avoid installing the Oracle Provider.
I have defined the following oracle function as an example:
create function GetImagePath (AIRSNumber in number)
return varchar2
is
begin
return '\\aiimg524\images\Ofndrtrk\2010\01\0kvrv1p000lcs74j';
end;
and I'm calling it using the following code:
using (var command = new OleDbCommand())
{
command.Connection = con;
command.CommandText = ConfigurationManager.AppSettings[OTRAK_PHOTO_FUNC];
command.CommandType = CommandType.StoredProcedure;
string parm = ConfigurationManager.AppSettings[OTRAK_PHOTO_PARM];
command.Parameters.Add(parm, OleDbType.Decimal); // maps to oracle Number
command.Parameters[parm].Direction = ParameterDirection.Input;
command.Parameters[parm].Value = airsNumber;
command.Parameters.Add(RETURN_VALUE, OleDbType.Variant); // maps to Oracle varchar2
command.Parameters[RETURN_VALUE].Direction = ParameterDirection.ReturnValue;
try
{
con.Open();
command.ExecuteNonQuery();
path = command.Parameters[RETURN_VALUE].Value.ToString();
}
I tried a bunch of different OleDB types for the parameter and the return value. the current attempt is from a mapping table i found on the web that said number = decimal and varchar2 = variant. I'm about to try every permutation of types in the enum and wanted to ask for help. the not so useful error message i get is:
[System.Data.OleDb.OleDbException] = {"ORA-06550: line 1, column 7:\nPLS-00306: wrong number or types of arguments in call to 'GETIMAGEPATH'\nORA-06550: line 1, column 7:\nPL/SQL: Statement ignored"}
This actually had nothing to do with the type of the parameters but the order. Using the OleDb provider for Oracle does not respect the names of the parameters in the parameter collection but rather the order that the parameters are added. Wwhen calling an oracle function, the return value is a free parameter that must be declared first. by adding my return value parameter and then the actual function parameter things started working.
using the command.Parameters.AddWithValue(parm, value) also simplifies things a bit.