/** Create the <TT>IDataSet</TT> to be displayed in this tab. */
protected IDataSet createDataSet() throws DataSetException {
final SQLConnection conn = getSession().getSQLConnection();
try {
final ResultSet rs = conn.getSQLMetaData().getExportedKeys(getTableInfo());
final ResultSetDataSet rsds = new ResultSetDataSet();
rsds.setResultSet(rs, getSession().getProperties().getLargeResultSetObjectInfo());
return rsds;
} catch (SQLException ex) {
throw new DataSetException(ex);
}
}
@Override
public void sqlResultSetAvailable(
ResultSetWrapper rs, final SQLExecutionInfo info, final IDataSetUpdateableTableModel model)
throws DataSetException {
final ResultSetDataSet rsds = new ResultSetDataSet();
rsds.setResultSet(rs.getResultSet(), _dialectType);
GUIUtils.processOnSwingEventThread(
new Runnable() {
public void run() {
updateExplainTab(info, model, rsds);
}
});
}
/** Create the <TT>IDataSet</TT> to be displayed in this tab. */
protected IDataSet createDataSet() throws DataSetException {
final ISession session = getSession();
final ISQLConnection conn = session.getSQLConnection();
ISQLDatabaseMetaData md = session.getMetaData();
try {
final Statement stmt = conn.createStatement();
try {
final SessionProperties props = session.getProperties();
if (props.getContentsLimitRows()) {
try {
stmt.setMaxRows(props.getContentsNbrRowsToShow());
} catch (Exception ex) {
s_log.error("Error on Statement.setMaxRows()", ex);
}
}
final ITableInfo ti = getTableInfo();
/**
* When the SessionProperties are set to read-only (either table or text) but the user has
* selected "Make Editable" on the Popup menu, we want to limit the edit capability to only
* that table, and only for as long as the user is looking at that one table. When the user
* switches away to another table, that new table should not be editable.
*/
final String currentTableName = ti.getQualifiedName();
if (!currentTableName.equals(previousTableName)) {
previousTableName = currentTableName; // needed to prevent an infinite loop
_dataSetUpdateableTableModel.setEditModeForced(false);
/**
* Tell the GUI to rebuild itself. Unfortunately, this has the side effect of calling this
* same function another time. The second call does not seem to be a problem, but we need
* to have reset the previousTableName before makeing this call or we will be in an
* infinite loop.
*/
// props.forceTableContentsOutputClassNameChange();
}
/**
* If the table has a pseudo-column that is the best unique identifier for the rows (like
* Oracle's rowid), then we want to include that field in the query so that it will be
* available if the user wants to edit the data later.
*/
String pseudoColumn = "";
try {
BestRowIdentifier[] rowIDs = md.getBestRowIdentifier(ti);
for (int i = 0; i < rowIDs.length; ++i) {
short pseudo = rowIDs[i].getPseudoColumn();
if (pseudo == DatabaseMetaData.bestRowPseudo) {
pseudoColumn = " ," + rowIDs[i].getColumnName();
break;
}
}
}
// Some DBMS's (EG Think SQL) throw an exception on a call to
// getBestRowIdentifier.
catch (Throwable th) {
if (s_log.isDebugEnabled()) {
s_log.debug("getBestRowIdentifier not supported for table " + currentTableName, th);
}
}
// TODO: - Col - Add method to Databasemetadata that returns array
// of objects for getBestRowIdentifier. For PostgreSQL put this kludge in
// the new function. THis way all the kludges are kept in one place.
//
// KLUDGE!!!!!!
//
// For some DBs (e.g. PostgreSQL) there is actually a pseudo-column
// providing the rowId, but the getBestRowIdentifier function is not
// implemented. This kludge hardcodes the knowledge that specific
// DBs use a specific pseudo-column. Additionally, as of pg 8.1,
// you must create the table using "WITH OID" appended to the create
// statement. Otherwise, OID column is not available by default.
//
if (pseudoColumn.length() == 0) {
if (DialectFactory.isPostgreSQL(md)) {
pseudoColumn = ", oid";
}
if (DialectFactory.isOracle(md)) {
pseudoColumn = ", ROWID";
}
}
ResultSet rs = null;
try {
// Note. Some DBMSs such as Oracle do not allow:
// "select *, rowid from table"
// You cannot have any column name in the columns clause
// if you have * in there. Aliasing the table name seems to
// be the best way to get around the problem.
final StringBuffer buf = new StringBuffer();
buf.append("select tbl.*")
.append(pseudoColumn)
.append(" from ")
.append(ti.getQualifiedName())
.append(" tbl");
String clause =
_sqlFilterClauses.get(WhereClausePanel.getClauseIdentifier(), ti.getQualifiedName());
if ((clause != null) && (clause.length() > 0)) {
buf.append(" where ").append(clause);
}
clause =
_sqlFilterClauses.get(
OrderByClausePanel.getClauseIdentifier(), ti.getQualifiedName());
if ((clause != null) && (clause.length() > 0)) {
buf.append(" order by ").append(clause);
}
if (s_log.isDebugEnabled()) {
s_log.debug("createDataSet running SQL: " + buf.toString());
}
showWaitDialog(stmt);
rs = stmt.executeQuery(buf.toString());
} catch (SQLException ex) {
if (s_log.isDebugEnabled()) {
s_log.debug("createDataSet: exception from pseudocolumn query - " + ex, ex);
}
// We assume here that if the pseudoColumn was used in the query,
// then it was likely to have caused the SQLException. If not,
// (length == 0), then retrying the query won't help - just throw
// the exception.
if (pseudoColumn.length() == 0) {
throw ex;
}
// pseudocolumn query failed, so reset it. Otherwise, we'll
// mistake the last column for a pseudocolumn and make it
// uneditable
pseudoColumn = "";
// Some tables have pseudo column primary keys and others
// do not. JDBC on some DBMSs does not handle pseudo
// columns 'correctly'. Also, getTables returns 'views' as
// well as tables, so the thing we are looking at might not
// be a table. (JDBC does not give a simple way to
// determine what we are looking at since the type of
// object is described in a DBMS-specific encoding.) For
// these reasons, rather than testing for all these
// conditions, we just try using the pseudo column info to
// get the table data, and if that fails, we try to get the
// table data without using the pseudo column.
// TODO: Should we change the mode from editable to
// non-editable?
final StringBuffer buf = new StringBuffer();
buf.append("select *").append(" from ").append(ti.getQualifiedName()).append(" tbl");
String clause =
_sqlFilterClauses.get(WhereClausePanel.getClauseIdentifier(), ti.getQualifiedName());
if ((clause != null) && (clause.length() > 0)) {
buf.append(" where ").append(clause);
}
clause =
_sqlFilterClauses.get(
OrderByClausePanel.getClauseIdentifier(), ti.getQualifiedName());
if ((clause != null) && (clause.length() > 0)) {
buf.append(" order by ").append(clause);
}
rs = stmt.executeQuery(buf.toString());
}
final ResultSetDataSet rsds = new ResultSetDataSet();
// to allow the fw to save and reload user options related to
// specific columns, we construct a unique name for the table
// so the column can be associcated with only that table.
// Some drivers do not provide the catalog or schema info, so
// those parts of the name will end up as null. That's ok since
// this string is never viewed by the user and is just used to
// distinguish this table from other tables in the DB.
// We also include the URL used to connect to the DB so that
// the same table/DB on different machines is treated differently.
rsds.setContentsTabResultSet(
rs, _dataSetUpdateableTableModel.getFullTableName(), DialectFactory.getDialectType(md));
if (rs != null) {
try {
rs.close();
} catch (SQLException e) {
}
}
// KLUDGE:
// We want some info about the columns to be available for validating the
// user input during cell editing operations. Ideally we would get that
// info inside the ResultSetDataSet class during the creation of the
// columnDefinition objects by using various functions in ResultSetMetaData
// such as isNullable(idx). Unfortunately, in at least some DBMSs (e.g.
// Postgres, HSDB) the results of those calls are not the same (and are less accurate
// than) the SQLMetaData.getColumns() call used in ColumnsTab to get the column info.
// Even more unfortunate is the fact that the set of attributes reported on by the two
// calls is not the same, with the ResultSetMetadata listing things not provided by
// getColumns. Most of the data provided by the ResultSetMetaData calls is correct.
// However, the nullable/not-nullable property is not set correctly in at least two
// DBMSs, while it is correct for those DBMSs in the getColumns() info. Therefore,
// we collect the collumn nullability information from getColumns() and pass that
// info to the ResultSet to override what it got from the ResultSetMetaData.
TableColumnInfo[] columnInfos = md.getColumnInfo(getTableInfo());
final ColumnDisplayDefinition[] colDefs =
rsds.getDataSetDefinition().getColumnDefinitions();
// get the nullability information and pass it into the ResultSet
// Unfortunately, not all DBMSs provide the column number in object 17 as stated in the
// SQL documentation, so we have to guess that the result set is in column order
for (int i = 0; i < columnInfos.length; i++) {
boolean isNullable = true;
TableColumnInfo info = columnInfos[i];
if (info.isNullAllowed() == DatabaseMetaData.columnNoNulls) {
isNullable = false;
}
if (i < colDefs.length) {
colDefs[i].setIsNullable(isNullable);
}
}
// ?? remember which column is the rowID (if any) so we can
// ?? prevent editing on it
if (pseudoColumn.length() > 0) {
_dataSetUpdateableTableModel.setRowIDCol(rsds.getColumnCount() - 1);
}
return rsds;
} finally {
SQLUtilities.closeStatement(stmt);
}
} catch (SQLException ex) {
throw new DataSetException(ex);
} finally {
disposeWaitDialog();
}
}
