/**
* ** Returns true if the parent records in their respective parent tables exist. ** @return True
* if the parent records exist.
*/
public boolean parentsExist() throws DBException {
DBFactory<gDBR> dbFact = this.getFactory();
DBFieldValues myFldVals = this.getFieldValues();
java.util.List<String> parentList = dbFact.getParentTables();
for (String parentTable : parentList) {
/* get parent table DBFactory */
Print.logInfo("[%s] Parent table: %s", this.getTableName(), parentTable);
DBFactory parentFact = DBFactory.getFactoryByName(parentTable);
if (parentFact == null) {
Print.logError("Unexpected error finding parent table: " + parentTable);
return false;
}
/* create parent record key with fields from this key */
DBRecordKey parentKey = parentFact.createKey(); // an empty key
DBField parentKeyFlds[] = parentFact.getKeyFields();
for (DBField pkf : parentKeyFlds) {
String pfn = pkf.getName();
/* get this DBField */
DBField myKeyFld = this.getField(pfn);
if (myKeyFld == null) {
Print.logError("Unexpected error finding field: [" + this.getTableName() + "] " + pfn);
return false;
}
/* get parent key field value */
Object pkv = myFldVals.getFieldValue(pfn);
if (pkv == null) {
Print.logError("Unexpected error finding parent field: [" + parentTable + "] " + pfn);
return false;
}
if (myKeyFld.isDefaultValue(pkv)) {
Print.logInfo("This key contains a global value, skipping parent check: " + parentTable);
parentKey = null;
break;
}
parentKey.setFieldValue(pfn, pkv);
}
/* check parent existence */
if ((parentKey != null) && !parentKey.exists()) {
Print.logError("Parent record does not exist: [" + parentTable + "] " + parentKey);
return false;
}
}
return true;
}
/**
* ** Returns true if the specified key attribute exists in the table ** @param altIndexName The
* alternate index name, or null to use the primary index ** @param whereKeyType The partial key
* match type ** @return True if the specified key attribute exists in the table, false otherwise
*/
protected boolean _exists(String altIndexName, int whereKeyType)
throws SQLException, DBException {
/* key fields */
boolean usePrimaryKey = StringTools.isBlank(altIndexName);
DBField kfld[] = usePrimaryKey ? this.getKeyFields() : this.getAltKeyFields(altIndexName);
if (ListTools.isEmpty(kfld)) {
throw new DBException("No keys found!");
}
/* check last key for "auto_increment" */
if (whereKeyType == DBWhere.KEY_FULL) {
DBField lastField = kfld[kfld.length - 1];
if (lastField.isAutoIncrement()
&& !this.getFieldValues().hasFieldValue(lastField.getName())) {
// full key requested and last key is auto_increment, which is missing
return false;
}
}
// DBSelect: SELECT <Keys> FROM <TableName> <KeyWhere>
String firstKey = kfld[0].getName();
DBSelect<gDBR> dsel = new DBSelect<gDBR>(this.getFactory());
dsel.setSelectedFields(firstKey);
dsel.setWhere(this._getWhereClause(altIndexName, whereKeyType));
/* get keyed record */
DBConnection dbc = null;
Statement stmt = null;
ResultSet rs = null;
boolean exists = false;
try {
dbc = DBConnection.getDefaultConnection();
stmt = dbc.execute(dsel.toString()); // may throw DBException
rs = stmt.getResultSet();
exists = rs.next();
} catch (SQLException sqe) {
if (sqe.getErrorCode() == DBFactory.SQLERR_TABLE_NOTLOCKED) {
// MySQL: This case has been seen on rare occasions. Not sure what causes it.
Print.logError("SQL Lock Error: " + sqe);
Print.logError("Hackery! Forcing lock on table: " + this.getTableName());
if (DBProvider.lockTableForRead(this.getTableName(), true)) { // may throw DBException
stmt = dbc.execute(dsel.toString()); // may throw SQLException, DBException
rs = stmt.getResultSet(); // SQLException
exists = rs.next(); // SQLException
DBProvider.unlockTables(); // DBException
}
} else {
throw sqe;
}
} finally {
if (rs != null) {
try {
rs.close();
} catch (Throwable t) {
}
}
if (stmt != null) {
try {
stmt.close();
} catch (Throwable t) {
}
}
DBConnection.release(dbc);
}
return exists;
}
