Does Oracle ~>12 support generated keys using a Merge statement? Some sudo code..
MERGE INTO TARGET_TABLE TRG
USING (SELECT CAST(? AS NUMBER) AS ID FROM DUAL) SRC
ON (TRG.ID = SRC.ID)
WHEN MATCHED THEN UPDATE SET....
WHEN NOT MATCHED THEN
INSERT(ID....)
VALUES(MYSEQ.NEXTVAL...)
The prepared statement is set up;
try (PreparedStatement pstmt =
connection.prepareStatement(
loadStatement(sqlName, connection, getClass()), new String[] {ID})) {
...
int inserted = pstmt.executeUpdate();
ResultSet rs = pstmt.getGeneratedKeys();
List<Long> keys = new ArrayList<>(inserted);
while (rs.next) {
rs.getLong(1);
}
return keys;
...
I have in-memory tests where the connection uses the H2 driver running the very same SQL and PreparedStatment and that returns the generated key just fine, but Oracle does not.
Reviewing the docs it would suggest it does not?
Thanks!
Related
Is it possible to get "hints" formatted query output using oracle jdbc driver?
example query
Select /*insert*/ * from sample_table
or
Select /*html*/ * from sample_table
looks like the stmt.executeQuer is just ignoring formatting "hints" and only return Select * results
try {
stmt = conn.createStatement();
ResultSet rs = stmt.executeQuery("Select /*insert*/ * from sample_table where ID = 1");
while (rs.next()) {
inserts.add(rs.getString(1));
}
} catch (SQLException e) {
log.error("SQL Error", e);
} finally {
UPD: As mentioned in the comments the /*insert*/ "hint" is specific to the SQL Developer and SQLcl clients.
I was able to get the query formatted output from SQLcl client
The eventual goal is to get formatted query output from Java code.
So re-phrasing the question: how to run query and get output through SQLcl using java ?
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 ... )
We are trying out the Devart Oracle adapter but are having problems with existing code that worked with the Oracle's DataAccess DLL. We get the following example error on command.ExecuteNonQuery():
ORA-01400: cannot insert NULL into
("DatabaseName"."table_name"."col3")
Here is some example code:
const string query = #"INSERT INTO table_name (table_name_id, col1, col2, col3)
VALUES(table_name_id_seq.nextval, :col1, :col2, :col3)
RETURNING table_name_id INTO :output_id";
OracleParameter outputParam = new OracleParameter(":output_id", OracleDbType.Long, ParameterDirection.Output);
OracleParameter[] parameters = new OracleParameter[]
{
outputParam,
new OracleParameter(":col1", OracleDbType.VarChar, col1, ParameterDirection.Input),
new OracleParameter(":col2", OracleDbType.VarChar, col2, ParameterDirection.Input),
new OracleParameter(":col3", OracleDbType.Long, col3, ParameterDirection.Input)
}
using (OracleCommand command = connection.CreateCommand())
{
command.CommandText = query;
command.CommandType = CommandType.Text;
command.Parameters.AddRange(parameters);
command.ExecuteNonQuery();
int outputId = Convert.ToInt32(outputParam.Value.ToString());
}
What are we doing wrong? We are trying to insert a row using a sequence for the PK, and return the PK for that row all in one query.
Also, the query runs fine if I remove the output parameter and the returning line in the query.
Thank you for your report. We have reproduced the issue and are investigating it. As a workaround, please switch to the Direct Mode: http://www.devart.com/dotconnect/oracle/docs/?directmode.html .
I am using jooq to build queries for Oracle. Everything works fine except for dates:
public static void main(String[] args) throws SQLException {
java.sql.Timestamp now = new java.sql.Timestamp(new Date().getTime());
Connection con = DriverManager.getConnection(... , ... , ...);
final Factory create = new OracleFactory(con);
Statement s = con.createStatement();
s.execute("create table test_table ( test_column DATE )");
s.execute("insert into test_table values (to_date('20111111', 'yyyymmdd'))");
// -- using to_date
ResultSet rs = s.executeQuery("select count(1) from test_table where test_column<to_date('20121212', 'yyyymmdd')");
rs.next();
System.out.println(""+rs.getInt(1));
rs.close();
// -- using a preparedstatement with java.sql.timestamp
PreparedStatement ps = con.prepareStatement("select count(1) from test_table where test_column<?");
ps.setTimestamp(1,now);
rs = ps.executeQuery();
rs.next();
System.out.println(""+rs.getInt(1));
rs.close();
// -- using jooq with java.sql.timestamp
final org.jooq.Table<org.jooq.Record> table = create.tableByName("TEST_TABLE");
final org.jooq.SelectSelectStep sss = create.select(create.count());
final org.jooq.SelectJoinStep sjs = sss.from(table);
final org.jooq.SelectConditionStep scs = sjs.where(create.fieldByName("TEST_COLUMN").lessThan(now));
System.out.println(scs.toString());
rs = s.executeQuery(scs.toString());
rs.next();
System.out.println(""+rs.getInt(1));
rs.close();
s.close();
}
Gives the following output:
1
1
select count(*) from "TEST_TABLE" where "TEST_COLUMN" < '2012-12-12 19:42:34.957'
Exception in thread "main" java.sql.SQLDataException: ORA-01861: literal does not match format string
I would have thought that JOOQ would check the type of Object in lessThan(Object)
to determine whether it can come up with a reasonable conversion, but apparently it
just does an Object.toString() in this case. I also remember that I never had issues with date queries via JOOQ in MySQL (although this is a while back). What am I doing wrong?
I suspect that this issue is due to the fact that create.fieldByName() doesn't know the type of the column (hence, Object), and coerces that unknown type on the right hand side of the comparison predicate. That should be fixed in jOOQ. I have registered #2007 for this:
https://github.com/jOOQ/jOOQ/issues/2007
In the mean time, try explicitly setting the type on your field:
create.fieldByName(Timestamp.class, "TEST_COLUMN").lessThan(now)
I am trying to implement a "if exists, update, otherwise, insert" data access method in NHibernate. My database is Oracle 10g.
I am getting this "could not execute native bulk manipulation query" error when try to run this code, if I run the insert or update individualy, it works just fine.
Thanks!
string sql = #"DECLARE
CntOfRow Number(10,0);
BEGIN
SELECT count(*)
INTO CntOfRow
FROM Table1
WHERE
QueID=:QueID
IF CntOfRow=0 THEN
INSERT INTO Table1 ...;
ELSE
UPDATE Table1 ... ;
END IF;
END;";
INHibernateSession session = NHibernateSessionManager.Instance.Session;
try
{
session.BeginTransaction();
ISQLQuery query = session.GetISession().CreateSQLQuery(sql.Replace(System.Environment.NewLine, " "));
query.SetParameter("QueID", queID);
query.ExecuteUpdate();
session.CommitTransaction();
}
catch (Exception ex)
{
session.RollbackTransaction();
throw;
}
I don't know why you get that error, but you could try this simpler PL/SQL block instead:
BEGIN
INSERT INTO Table1 ...;
EXCEPTION
WHEN DUP_VAL_ON_INDEX THEN
UPDATE Table1 ... ;
END;";
You seem to be missing an ; after the SELECT
This link might also be of interest to you.
As about inserting/updating, see MERGE statement. It works like this:
MERGE INTO t1 dest
USING (SELECT 1 pk, 11 i FROM dual) src
ON (dest.pk = src.pk)
WHEN NOT MATCHED THEN INSERT (dest.pk, dest.i) VALUES (src.pk, src.i)
WHEN MATCHED THEN UPDATE SET dest.i = src.i;
Also see this topic
Go to an Oracle client like Toad or SQL Editor and try to execute the procedure with the same parameters that you send through Hibernate.
In my case, Oracle was throwing an error like:
11:50:57 ORA-01403: no data found
The cause was a select inside of procedure/function. Then improve the procedure/function to catch these exceptions.