/**
* Method declaration
*
* ALTER TABLE tableName ADD COLUMN columnName columnType;
* ALTER TABLE tableName DELETE COLUMN columnName;
*
* <B>Note: </B>The only change I've made to Sergio's original code was
* changing the insert's to call insertNoCheck to bypass the trigger
* mechanism that is a part of hsqldb 1.60 and beyond. - Mark Tutt
*
* @return
*
* @throws Exception
*/
public Result processAlter()
{
tTokenizer.getThis("TABLE");
string token = tTokenizer.getstring();
cChannel.checkReadWrite();
// cChannel.check(token,Access.ALTER); --> Accessul nu-l inca controleaza...
string tName = token;
string swap = tName + "SWAP";
// nimicirea swapului...
dDatabase.execute("DROP TABLE " + swap, cChannel);
Table initialTable = dDatabase.getTable(token, cChannel);
int count = 0;
token = tTokenizer.getstring();
if (token.Equals("ADD"))
{
token = tTokenizer.getstring();
if (token.Equals("COLUMN"))
{
Table swapTable = new Table(dDatabase, true, swap,
initialTable.isCached());
// copiem coloanele (fara date) din tabelul initial in swap
for (int i = 0; i < initialTable.getColumnCount(); i++)
{
Column aColumn = initialTable.getColumn(i);
swapTable.addColumn(aColumn);
}
// end Of copiem coloanele...
// aflam daca are PrimaryKey & o cream...
string cName = tTokenizer.getstring();
string cType = tTokenizer.getstring();
int iType = Column.getTypeNr(cType);
string sToken = cType;
// int primarykeycolumn = -1;
bool identity = false;
int column = initialTable.getColumnCount() + 1;
// !--
// stolen from CREATE TABLE...
string sColumn = cName;
if (iType == Column.VARCHAR && dDatabase.isIgnoreCase())
{
iType = Column.VARCHAR_IGNORECASE;
}
sToken = tTokenizer.getstring();
if (iType == Column.DOUBLE && sToken.Equals("PRECISION"))
{
sToken = tTokenizer.getstring();
}
if (sToken.Equals("("))
{
// overread length
do
{
sToken = tTokenizer.getstring();
} while (!sToken.Equals(")"));
sToken = tTokenizer.getstring();
}
// !--
bool nullable = true;
if (sToken.Equals("NULL"))
{
sToken = tTokenizer.getstring();
}
else if (sToken.Equals("NOT"))
{
tTokenizer.getThis("NULL");
nullable = false;
sToken = tTokenizer.getstring();
}
/*
* if(sToken.Equals("IDENTITY")) {
* identity=true;
* Trace.check(primarykeycolumn==-1,Trace.SECOND_PRIMARY_KEY,sColumn);
* sToken=tTokenizer.getstring();
* primarykeycolumn=column;
* }
*
* if(sToken.Equals("PRIMARY")) {
* tTokenizer.getThis("KEY");
* Trace.check(identity || primarykeycolumn==-1,
* Trace.SECOND_PRIMARY_KEY,sColumn);
* primarykeycolumn=column;
* //sToken=tTokenizer.getstring();
* }
* //end of STOLEN...
*/
swapTable.addColumn(cName, iType, nullable,
identity); // under construction...
if (initialTable.getColumnCount()
< initialTable.getInternalColumnCount())
{
swapTable.createPrimaryKey();
}
else
{
swapTable.createPrimaryKey(initialTable.getPrimaryIndex().getColumns()[0]);
}
// endof PrimaryKey...
// sa ne farimam cu indicii... ;-((
Index idx = null;
while (true)
{
idx = initialTable.getNextIndex(idx);
if (idx == null)
{
break;
}
if (idx == initialTable.getPrimaryIndex())
{
continue;
}
swapTable.createIndex(idx);
}
// end of Index...
cChannel.commit();
dDatabase.linkTable(swapTable);
Tokenizer tmpTokenizer = new Tokenizer("SELECT * FROM "
+ tName);
Parser pp = new Parser(dDatabase, tmpTokenizer, cChannel);
string ff = tmpTokenizer.getstring();
if (!initialTable.isEmpty())
{
Record n = ((Result) pp.processSelect()).rRoot;
do
{
object[] row = swapTable.getNewRow();
object[] row1 = n.data;
for (int i = 0; i < initialTable.getColumnCount();
i++)
{
row[i] = row1[i];
}
swapTable.insertNoCheck(row, cChannel);
n = n.next;
} while (n != null);
}
dDatabase.execute("DROP TABLE " + tName, cChannel);
// cream tabelul vechi cu proprietatile celui nou...
initialTable = new Table(dDatabase, true, tName,
swapTable.isCached());
for (int i = 0; i < swapTable.getColumnCount(); i++)
{
Column aColumn = swapTable.getColumn(i);
initialTable.addColumn(aColumn);
}
if (swapTable.getColumnCount()
< swapTable.getInternalColumnCount())
{
initialTable.createPrimaryKey();
}
else
{
initialTable.createPrimaryKey(swapTable.getPrimaryIndex().getColumns()[0]);
}
// endof PrimaryKey...
// sa ne farimam cu indicii... ;-((
idx = null;
while (true)
{
idx = swapTable.getNextIndex(idx);
if (idx == null)
{
break;
}
if (idx == swapTable.getPrimaryIndex())
{
continue;
}
initialTable.createIndex(idx);
}
// end of Index...
cChannel.commit();
dDatabase.linkTable(initialTable);
// end of cream...
// copiem datele din swap in tabel...
tmpTokenizer = new Tokenizer("SELECT * FROM " + swap);
pp = new Parser(dDatabase, tmpTokenizer, cChannel);
ff = tmpTokenizer.getstring();
if (!swapTable.isEmpty())
{
Record n = ((Result) pp.processSelect()).rRoot;
do
{
object[] row = initialTable.getNewRow();
object[] row1 = n.data;
for (int i = 0; i < swapTable.getColumnCount(); i++)
{
row[i] = row1[i];
}
initialTable.insertNoCheck(row, cChannel);
n = n.next;
} while (n != null);
// end of copiem...
}
dDatabase.execute("DROP TABLE " + swap, cChannel);
count = 4;
}
else
{
throw Trace.error(Trace.UNEXPECTED_TOKEN, token);
}
}
else if (token.Equals("DELETE"))
{
token = tTokenizer.getstring();
if (token.Equals("COLUMN"))
{
Table swapTable = new Table(dDatabase, true, swap,
initialTable.isCached());
string cName = tTokenizer.getstring();
int undesired = initialTable.getColumnNr(cName);
for (int i = 0; i < initialTable.getColumnCount(); i++)
{
Column aColumn = initialTable.getColumn(i);
if (i != undesired)
{
swapTable.addColumn(aColumn);
}
}
int pKey = -1;
// !--
if (initialTable.getColumnCount()
< initialTable.getInternalColumnCount())
{
swapTable.createPrimaryKey();
}
else
{
int[] cols = initialTable.getPrimaryIndex().getColumns();
pKey = cols[0];
if ((cols[0] > undesired)
|| (cols[0] + cols.Length < undesired))
{
if (undesired
< initialTable.getPrimaryIndex().getColumns()[0])
{
// reindexarea...
for (int i = 0; i < cols.Length; i++)
{
cols[i]--;
}
// endOf reindexarea...
}
// MT: This initially wouldn't compile, missing the array index on cols[]
swapTable.createPrimaryKey(cols[0]);
}
else
{
swapTable.createPrimaryKey();
}
}
// endof PrimaryKey...
// sa ne farimam cu indicii... ;-((
Index idx = null;
while (true)
{
idx = initialTable.getNextIndex(idx);
if (idx == null)
{
break;
}
if (idx == initialTable.getPrimaryIndex())
{
continue;
}
bool flag = true;
int[] cols = idx.getColumns();
for (int i = 0; i < cols.Length; i++)
{
if (cols[i] == undesired)
{
flag = false;
}
}
if (flag)
{
Index tIdx;
for (int i = 0; i < cols.Length; i++)
{
if (cols[i] > undesired)
{
cols[i]--;
}
}
tIdx = new Index(idx.getName(), idx.getColumns(),
idx.getType(), idx.isUnique());
swapTable.createIndex(tIdx);
}
}
// !--
cChannel.commit();
dDatabase.linkTable(swapTable);
Tokenizer tmpTokenizer = new Tokenizer("SELECT * FROM "
+ tName);
Parser pp = new Parser(dDatabase, tmpTokenizer, cChannel);
string ff = tmpTokenizer.getstring();
if (!initialTable.isEmpty())
{
Record n = ((Result) pp.processSelect()).rRoot;
do
{
object[] row = swapTable.getNewRow();
object[] row1 = n.data;
int j = 0;
for (int i = 0; i < initialTable.getColumnCount();
i++)
{
if (i != undesired)
{
row[j] = row1[i];
j++;
}
}
swapTable.insertNoCheck(row, cChannel);
n = n.next;
} while (n != null);
}
dDatabase.execute("DROP TABLE " + tName, cChannel);
// cream tabelul vechi cu proprietatile celui nou...
initialTable = new Table(dDatabase, true, tName,
swapTable.isCached());
for (int i = 0; i < swapTable.getColumnCount(); i++)
{
Column aColumn = swapTable.getColumn(i);
initialTable.addColumn(aColumn);
}
// !--
if (swapTable.getColumnCount()
< swapTable.getInternalColumnCount())
{
initialTable.createPrimaryKey();
}
else
{
initialTable.createPrimaryKey(swapTable.getPrimaryIndex().getColumns()[0]);
}
// endof PrimaryKey...
// sa ne farimam cu indicii... ;-((
idx = null;
while (true)
{
idx = swapTable.getNextIndex(idx);
if (idx == null)
{
break;
}
if (idx == swapTable.getPrimaryIndex())
{
continue;
}
initialTable.createIndex(idx);
}
// end of Index...
// !--
cChannel.commit();
dDatabase.linkTable(initialTable);
// end of cream...
// copiem datele din swap in tabel...
tmpTokenizer = new Tokenizer("SELECT * FROM " + swap);
pp = new Parser(dDatabase, tmpTokenizer, cChannel);
ff = tmpTokenizer.getstring();
if (!swapTable.isEmpty())
{
Record n = ((Result) pp.processSelect()).rRoot;
do
{
object[] row = initialTable.getNewRow();
object[] row1 = n.data;
for (int i = 0; i < swapTable.getColumnCount(); i++)
{
row[i] = row1[i];
}
initialTable.insertNoCheck(row, cChannel);
n = n.next;
} while (n != null);
// end of copiem...
}
dDatabase.execute("DROP TABLE " + swap, cChannel);
count = 3;
}
else
{
throw Trace.error(Trace.UNEXPECTED_TOKEN, token);
}
count = 3;
}
Result r = new Result();
r.iUpdateCount = count; // --> nu tre inca...??
return r;
}
/**
* Constructor declaration
*
*
* @param db
* @param t
* @param channel
*/
public Parser(Database db, Tokenizer t, Channel channel)
{
dDatabase = db;
tTokenizer = t;
cChannel = channel;
}
