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DdlNodes.epp
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/*
* The contents of this file are subject to the Interbase Public
* License Version 1.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy
* of the License at http://www.Inprise.com/IPL.html
*
* Software distributed under the License is distributed on an
* "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express
* or implied. See the License for the specific language governing
* rights and limitations under the License.
*
* The Original Code was created by Inprise Corporation
* and its predecessors. Portions created by Inprise Corporation are
* Copyright (C) Inprise Corporation.
*
* All Rights Reserved.
* Contributor(s): ______________________________________.
* Adriano dos Santos Fernandes - refactored from pass1.cpp, ddl.cpp, dyn*.epp
*/
#include "firebird.h"
#include "dyn_consts.h"
#include "../dsql/DdlNodes.h"
#include "../dsql/BoolNodes.h"
#include "../dsql/ExprNodes.h"
#include "../dsql/StmtNodes.h"
#include "firebird/impl/blr.h"
#include "../jrd/btr.h"
#include "../jrd/dyn.h"
#include "../jrd/flags.h"
#include "../jrd/intl.h"
#include "../jrd/jrd.h"
#include "../common/msg_encode.h"
#include "../jrd/obj.h"
#include "../jrd/ods.h"
#include "../jrd/tra.h"
#include "../common/os/path_utils.h"
#include "../jrd/CryptoManager.h"
#include "../jrd/IntlManager.h"
#include "../jrd/PreparedStatement.h"
#include "../jrd/ResultSet.h"
#include "../jrd/UserManagement.h"
#include "../jrd/blb_proto.h"
#include "../jrd/cmp_proto.h"
#include "../jrd/dfw_proto.h"
#include "../jrd/dpm_proto.h"
#include "../jrd/dyn_ut_proto.h"
#include "../jrd/exe_proto.h"
#include "../jrd/intl_proto.h"
#include "../common/isc_f_proto.h"
#include "../jrd/lck_proto.h"
#include "../jrd/met_proto.h"
#include "../jrd/scl_proto.h"
#include "../jrd/vio_proto.h"
#include "../dsql/ddl_proto.h"
#include "../dsql/errd_proto.h"
#include "../dsql/gen_proto.h"
#include "../dsql/make_proto.h"
#include "../dsql/metd_proto.h"
#include "../dsql/pass1_proto.h"
#include "../utilities/gsec/gsec.h"
#include "../common/dsc_proto.h"
#include "../common/StatusArg.h"
#include "../auth/SecureRemotePassword/Message.h"
#include "../jrd/Mapping.h"
#include "../jrd/extds/ExtDS.h"
namespace Jrd {
using namespace Firebird;
static void checkForeignKeyTempScope(thread_db* tdbb, jrd_tra* transaction,
const MetaName& childRelName, const MetaName& masterIndexName);
static void checkSpTrigDependency(thread_db* tdbb, jrd_tra* transaction,
const MetaName& relationName, const MetaName& fieldName);
static void checkViewDependency(thread_db* tdbb, jrd_tra* transaction,
const MetaName& relationName, const MetaName& fieldName);
static void clearPermanentField(dsql_rel* relation, bool permanent);
static void defineComputed(DsqlCompilerScratch* dsqlScratch, RelationSourceNode* relation,
dsql_fld* field, ValueSourceClause* clause, string& source, BlrDebugWriter::BlrData& value);
static void deleteKeyConstraint(thread_db* tdbb, jrd_tra* transaction,
const MetaName& relationName, const MetaName& constraintName, const MetaName& indexName);
static void defineFile(thread_db* tdbb, jrd_tra* transaction, SLONG shadowNumber, bool manualShadow,
bool conditionalShadow, SLONG& dbAlloc,
const PathName& name, SLONG start, SLONG length);
static bool fieldExists(thread_db* tdbb, jrd_tra* transaction, const MetaName& relationName,
const MetaName& fieldName);
static bool isItSqlRole(thread_db* tdbb, jrd_tra* transaction, const MetaName& inputName,
MetaName& outputName);
static int getGrantorOption(thread_db* tdbb, jrd_tra* transaction, const MetaName& grantor,
int grantorType, const MetaName& roleName);
static MetaName getIndexRelationName(thread_db* tdbb, jrd_tra* transaction,
const MetaName& indexName, bool& systemIndex);
static const char* getRelationScopeName(const rel_t type);
static void makeRelationScopeName(string& to, const MetaName& name, const rel_t type);
static void checkRelationType(const rel_t type, const MetaName& name);
static void checkFkPairTypes(const rel_t masterType, const MetaName& masterName,
const rel_t childType, const MetaName& childName);
static void modifyLocalFieldPosition(thread_db* tdbb, jrd_tra* transaction,
const MetaName& relationName, const MetaName& fieldName, USHORT newPosition);
static rel_t relationType(SSHORT relationTypeNull, SSHORT relationType);
static void saveField(thread_db* tdbb, DsqlCompilerScratch* dsqlScratch, const MetaName& fieldName);
static void saveRelation(thread_db* tdbb, DsqlCompilerScratch* dsqlScratch,
const MetaName& relationName, bool view, bool creating);
static void updateRdbFields(const TypeClause* type,
SSHORT& fieldType,
SSHORT& fieldLength,
SSHORT& fieldSubTypeNull, SSHORT& fieldSubType,
SSHORT& fieldScaleNull, SSHORT& fieldScale,
SSHORT& characterSetIdNull, SSHORT& characterSetId,
SSHORT& characterLengthNull, SSHORT& characterLength,
SSHORT& fieldPrecisionNull, SSHORT& fieldPrecision,
SSHORT& collationIdNull, SSHORT& collationId,
SSHORT& segmentLengthNull, SSHORT& segmentLength);
static const char* const CHECK_CONSTRAINT_EXCEPTION = "check_constraint";
DATABASE DB = STATIC "ODS.RDB";
//----------------------
void ExecInSecurityDb::executeInSecurityDb(jrd_tra* localTransaction)
{
LocalStatus st;
CheckStatusWrapper statusWrapper(&st);
SecDbContext* secDbContext = localTransaction->getSecDbContext();
if (!secDbContext)
{
Attachment* lAtt = localTransaction->getAttachment();
fb_assert(lAtt && lAtt->att_database && lAtt->att_database->dbb_config); // paranoid check
const char* secDb = lAtt->att_database->dbb_config->getSecurityDatabase();
ClumpletWriter dpb(ClumpletWriter::WideTagged, MAX_DPB_SIZE, isc_dpb_version2);
if (lAtt->att_user)
lAtt->att_user->populateDpb(dpb, true);
IAttachment* att = DispatcherPtr()->attachDatabase(&statusWrapper, secDb,
dpb.getBufferLength(), dpb.getBuffer());
check(&statusWrapper);
ITransaction* tra = att->startTransaction(&statusWrapper, 0, NULL);
check(&statusWrapper);
secDbContext = localTransaction->setSecDbContext(att, tra);
}
// run all statements under savepoint control
string savePoint;
savePoint.printf("ExecInSecurityDb%d", secDbContext->savePoint++);
secDbContext->att->execute(&statusWrapper, secDbContext->tra, 0, ("SAVEPOINT " + savePoint).c_str(),
SQL_DIALECT_V6, NULL, NULL, NULL, NULL);
check(&statusWrapper);
try
{
runInSecurityDb(secDbContext);
secDbContext->att->execute(&statusWrapper, secDbContext->tra, 0,
("RELEASE SAVEPOINT " + savePoint).c_str(),
SQL_DIALECT_V6, NULL, NULL, NULL, NULL);
savePoint.erase();
check(&statusWrapper);
}
catch (const Exception&)
{
if (savePoint.hasData())
{
LocalStatus tmp;
CheckStatusWrapper tmpCheckStatusWrapper(&tmp);
secDbContext->att->execute(&tmpCheckStatusWrapper, secDbContext->tra, 0,
("ROLLBACK TO SAVEPOINT " + savePoint).c_str(),
SQL_DIALECT_V6, NULL, NULL, NULL, NULL);
}
throw;
}
}
//----------------------
// Check temporary table reference rules between given child relation and master
// relation (owner of given PK/UK index).
static void checkForeignKeyTempScope(thread_db* tdbb, jrd_tra* transaction,
const MetaName& childRelName, const MetaName& masterIndexName)
{
AutoCacheRequest request(tdbb, drq_l_rel_info, DYN_REQUESTS);
MetaName masterRelName;
rel_t masterType, childType;
FOR(REQUEST_HANDLE request TRANSACTION_HANDLE transaction)
RLC_M IN RDB$RELATION_CONSTRAINTS CROSS
REL_C IN RDB$RELATIONS CROSS
REL_M IN RDB$RELATIONS
WITH (RLC_M.RDB$CONSTRAINT_TYPE EQ UNIQUE_CNSTRT OR
RLC_M.RDB$CONSTRAINT_TYPE EQ PRIMARY_KEY) AND
RLC_M.RDB$INDEX_NAME EQ masterIndexName.c_str() AND
REL_C.RDB$RELATION_NAME EQ childRelName.c_str() AND
REL_M.RDB$RELATION_NAME EQ RLC_M.RDB$RELATION_NAME
{
fb_assert(masterRelName.isEmpty());
masterRelName = REL_M.RDB$RELATION_NAME;
masterType = relationType(REL_M.RDB$RELATION_TYPE.NULL, REL_M.RDB$RELATION_TYPE);
childType = relationType(REL_C.RDB$RELATION_TYPE.NULL, REL_C.RDB$RELATION_TYPE);
}
END_FOR
if (masterRelName.hasData())
{
checkRelationType(masterType, masterRelName);
checkRelationType(childType, childRelName);
checkFkPairTypes(masterType, masterRelName, childType, childRelName);
}
}
// Check temporary table reference rules between just created child relation and all
// its master relations.
static void checkRelationTempScope(thread_db* tdbb, jrd_tra* transaction,
const MetaName& childRelName, const rel_t childType)
{
if (childType != rel_persistent &&
childType != rel_global_temp_preserve &&
childType != rel_global_temp_delete)
{
return;
}
AutoCacheRequest request(tdbb, drq_l_rel_info2, DYN_REQUESTS);
MetaName masterRelName;
rel_t masterType;
FOR(REQUEST_HANDLE request TRANSACTION_HANDLE transaction)
RLC_C IN RDB$RELATION_CONSTRAINTS CROSS
IND_C IN RDB$INDICES CROSS
IND_M IN RDB$INDICES CROSS
REL_M IN RDB$RELATIONS
WITH RLC_C.RDB$CONSTRAINT_TYPE EQ FOREIGN_KEY AND
RLC_C.RDB$RELATION_NAME EQ childRelName.c_str() AND
IND_C.RDB$INDEX_NAME EQ RLC_C.RDB$INDEX_NAME AND
IND_M.RDB$INDEX_NAME EQ IND_C.RDB$FOREIGN_KEY AND
IND_M.RDB$RELATION_NAME EQ REL_M.RDB$RELATION_NAME
{
fb_assert(masterRelName.isEmpty());
masterType = relationType(REL_M.RDB$RELATION_TYPE.NULL, REL_M.RDB$RELATION_TYPE);
masterRelName = REL_M.RDB$RELATION_NAME;
}
END_FOR
if (masterRelName.hasData())
{
checkRelationType(masterType, masterRelName);
checkFkPairTypes(masterType, masterRelName, childType, childRelName);
}
}
// Checks to see if the given field is referenced in a stored procedure or trigger.
// If the field is referenced, throw.
static void checkSpTrigDependency(thread_db* tdbb, jrd_tra* transaction,
const MetaName& relationName, const MetaName& fieldName)
{
AutoRequest request;
FOR(REQUEST_HANDLE request TRANSACTION_HANDLE transaction)
FIRST 1
DEP IN RDB$DEPENDENCIES
WITH DEP.RDB$DEPENDED_ON_NAME EQ relationName.c_str() AND
DEP.RDB$DEPENDED_ON_TYPE EQ obj_relation AND
DEP.RDB$FIELD_NAME EQ fieldName.c_str()
{
MetaName depName(DEP.RDB$DEPENDENT_NAME);
// msg 206: Column %s from table %s is referenced in %s.
status_exception::raise(
Arg::PrivateDyn(206) << fieldName << relationName << depName);
}
END_FOR
}
// Checks to see if the given field is referenced in a view. If it is, throw.
static void checkViewDependency(thread_db* tdbb, jrd_tra* transaction,
const MetaName& relationName, const MetaName& fieldName)
{
AutoRequest request;
FOR(REQUEST_HANDLE request TRANSACTION_HANDLE transaction)
FIRST 1
X IN RDB$RELATION_FIELDS CROSS
Y IN RDB$RELATION_FIELDS CROSS
Z IN RDB$VIEW_RELATIONS
WITH X.RDB$RELATION_NAME EQ relationName.c_str() AND
X.RDB$FIELD_NAME EQ fieldName.c_str() AND
X.RDB$FIELD_NAME EQ Y.RDB$BASE_FIELD AND
X.RDB$FIELD_SOURCE EQ Y.RDB$FIELD_SOURCE AND
Y.RDB$RELATION_NAME EQ Z.RDB$VIEW_NAME AND
X.RDB$RELATION_NAME EQ Z.RDB$RELATION_NAME AND
Y.RDB$VIEW_CONTEXT EQ Z.RDB$VIEW_CONTEXT
{
MetaName viewName(Z.RDB$VIEW_NAME);
// msg 206: Column %s from table %s is referenced in %s.
status_exception::raise(
Arg::PrivateDyn(206) << fieldName << relationName << viewName);
}
END_FOR
}
// Removes temporary pool pointers from field, stored in permanent cache.
static void clearPermanentField(dsql_rel* relation, bool permanent)
{
if (relation && relation->rel_fields && permanent)
{
relation->rel_fields->fld_procedure = NULL;
relation->rel_fields->ranges = NULL;
relation->rel_fields->charSet = NULL;
relation->rel_fields->subTypeName = NULL;
relation->rel_fields->fld_relation = relation;
}
}
// Define a COMPUTED BY clause, for a field or an index.
void defineComputed(DsqlCompilerScratch* dsqlScratch, RelationSourceNode* relation, dsql_fld* field,
ValueSourceClause* clause, string& source, BlrDebugWriter::BlrData& value)
{
// Get the table node and set up correct context.
dsqlScratch->resetContextStack();
// Save the size of the field if it is specified.
dsc saveDesc;
saveDesc.dsc_dtype = 0;
bool saveCharSetIdSpecified;
if (field && field->dtype)
{
fb_assert(field->dtype <= MAX_UCHAR);
saveDesc.dsc_dtype = (UCHAR) field->dtype;
saveDesc.dsc_length = field->length;
fb_assert(field->scale <= MAX_SCHAR);
saveDesc.dsc_scale = (SCHAR) field->scale;
saveDesc.dsc_sub_type = field->subType;
saveCharSetIdSpecified = field->charSetId.specified;
field->dtype = 0;
field->length = 0;
field->scale = 0;
field->subType = 0;
}
PASS1_make_context(dsqlScratch, relation);
ValueExprNode* input = Node::doDsqlPass(dsqlScratch, clause->value);
// Try to calculate size of the computed field. The calculated size
// may be ignored, but it will catch self references.
dsc desc;
DsqlDescMaker::fromNode(dsqlScratch, &desc, input);
// Generate the blr expression.
dsqlScratch->getBlrData().clear();
dsqlScratch->getDebugData().clear();
dsqlScratch->appendUChar(dsqlScratch->isVersion4() ? blr_version4 : blr_version5);
GEN_expr(dsqlScratch, input);
dsqlScratch->appendUChar(blr_eoc);
if (saveDesc.dsc_dtype)
{
// Restore the field size/type overrides.
field->dtype = saveDesc.dsc_dtype;
field->length = saveDesc.dsc_length;
field->scale = saveDesc.dsc_scale;
if (field->dtype <= dtype_any_text)
{
field->charSetId = DSC_GET_CHARSET(&saveDesc);
field->charSetId.specified = saveCharSetIdSpecified;
field->collationId = DSC_GET_COLLATE(&saveDesc);
}
else
field->subType = saveDesc.dsc_sub_type;
}
else if (field)
{
// Use size calculated.
field->dtype = desc.dsc_dtype;
field->length = desc.dsc_length;
field->scale = desc.dsc_scale;
if (field->dtype <= dtype_any_text)
{
field->charSetId = DSC_GET_CHARSET(&desc);
field->collationId = DSC_GET_COLLATE(&desc);
const USHORT adjust = field->dtype == dtype_varying ? sizeof(USHORT) : 0;
const USHORT bpc = METD_get_charset_bpc(dsqlScratch->getTransaction(), field->charSetId.value);
field->charLength = (field->length - adjust) / bpc;
}
else if (field->dtype == dtype_blob)
{
field->charSetId = desc.getCharSet();
field->collationId = desc.getCollation();
field->subType = desc.getBlobSubType();
}
else
field->subType = desc.dsc_sub_type;
}
if (field)
field->setExactPrecision();
dsqlScratch->resetContextStack();
// Generate the source text.
source = clause->source;
value.assign(dsqlScratch->getBlrData());
}
// Delete a record from RDB$RELATION_CONSTRAINTS based on a constraint name.
//
// On deleting from RDB$RELATION_CONSTRAINTS, 2 system triggers fire:
//
// (A) pre delete trigger: pre_delete_constraint, will:
//
// 1. delete a record first from RDB$REF_CONSTRAINTS where
// RDB$REF_CONSTRAINTS.RDB$CONSTRAINT_NAME =
// RDB$RELATION_CONSTRAINTS.RDB$CONSTRAINT_NAME
//
// (B) post delete trigger: post_delete_constraint will:
//
// 1. also delete a record from RDB$INDICES where
// RDB$INDICES.RDB$INDEX_NAME =
// RDB$RELATION_CONSTRAINTS.RDB$INDEX_NAME
//
// 2. also delete a record from RDB$INDEX_SEGMENTS where
// RDB$INDEX_SEGMENTS.RDB$INDEX_NAME =
// RDB$RELATION_CONSTRAINTS.RDB$INDEX_NAME
static void deleteKeyConstraint(thread_db* tdbb, jrd_tra* transaction,
const MetaName& relationName, const MetaName& constraintName, const MetaName& indexName)
{
SET_TDBB(tdbb);
AutoCacheRequest request(tdbb, drq_e_rel_const, DYN_REQUESTS);
bool found = false;
FOR(REQUEST_HANDLE request TRANSACTION_HANDLE transaction)
RC IN RDB$RELATION_CONSTRAINTS
WITH RC.RDB$CONSTRAINT_NAME EQ constraintName.c_str() AND
RC.RDB$CONSTRAINT_TYPE EQ FOREIGN_KEY AND
RC.RDB$RELATION_NAME EQ relationName.c_str() AND
RC.RDB$INDEX_NAME EQ indexName.c_str()
{
found = true;
ERASE RC;
}
END_FOR
if (!found)
{
// msg 130: "CONSTRAINT %s does not exist."
status_exception::raise(
Arg::PrivateDyn(130) << constraintName);
}
}
// Define a database or shadow file.
static void defineFile(thread_db* tdbb, jrd_tra* transaction, SLONG shadowNumber, bool manualShadow,
bool conditionalShadow, SLONG& dbAlloc, const PathName& name, SLONG start, SLONG length)
{
PathName expandedName = name;
if (!ISC_expand_filename(expandedName, false))
status_exception::raise(Arg::PrivateDyn(231)); // File name is invalid.
if (tdbb->getDatabase()->dbb_filename == expandedName)
status_exception::raise(Arg::PrivateDyn(166));
AutoCacheRequest request(tdbb, drq_l_files, DYN_REQUESTS);
FOR(REQUEST_HANDLE request TRANSACTION_HANDLE transaction)
FIRST 1 X IN RDB$FILES
WITH X.RDB$FILE_NAME EQ expandedName.c_str()
{
status_exception::raise(Arg::PrivateDyn(166));
}
END_FOR
request.reset(tdbb, drq_s_files, DYN_REQUESTS);
STORE(REQUEST_HANDLE request TRANSACTION_HANDLE transaction)
X IN RDB$FILES
{
expandedName.copyTo(X.RDB$FILE_NAME, sizeof(X.RDB$FILE_NAME));
X.RDB$SHADOW_NUMBER = shadowNumber;
X.RDB$FILE_FLAGS = (manualShadow ? FILE_manual : 0) |
(conditionalShadow ? FILE_conditional : 0);
dbAlloc = MAX(dbAlloc, start);
X.RDB$FILE_START = dbAlloc;
X.RDB$FILE_LENGTH = length;
dbAlloc += length;
}
END_STORE
}
// Checks to see if the given field already exists in a relation.
static bool fieldExists(thread_db* tdbb, jrd_tra* transaction, const MetaName& relationName,
const MetaName& fieldName)
{
AutoRequest request;
bool found = false;
FOR(REQUEST_HANDLE request TRANSACTION_HANDLE transaction)
FLD IN RDB$RELATION_FIELDS
WITH FLD.RDB$RELATION_NAME EQ relationName.c_str() AND
FLD.RDB$FIELD_NAME EQ fieldName.c_str()
{
found = true;
}
END_FOR
return found;
}
// If inputName is found in RDB$ROLES, then returns true. Otherwise returns false.
static bool isItSqlRole(thread_db* tdbb, jrd_tra* transaction, const MetaName& inputName,
MetaName& outputName)
{
AutoCacheRequest request(tdbb, drq_get_role_nm, DYN_REQUESTS);
FOR(REQUEST_HANDLE request TRANSACTION_HANDLE transaction)
X IN RDB$ROLES
WITH X.RDB$ROLE_NAME EQ inputName.c_str()
{
outputName = X.RDB$OWNER_NAME;
return true;
}
END_FOR
return false;
}
// Make string with relation name and type of its temporary scope.
static void makeRelationScopeName(string& to, const MetaName& name, const rel_t type)
{
const char* scope = getRelationScopeName(type);
to.printf(scope, name.c_str());
}
// Get relation name of an index.
static MetaName getIndexRelationName(thread_db* tdbb, jrd_tra* transaction,
const MetaName& indexName, bool& systemIndex)
{
systemIndex = false;
AutoCacheRequest request(tdbb, drq_l_index_relname, DYN_REQUESTS);
FOR(REQUEST_HANDLE request TRANSACTION_HANDLE transaction)
IDX IN RDB$INDICES
WITH IDX.RDB$INDEX_NAME EQ indexName.c_str()
{
systemIndex = IDX.RDB$SYSTEM_FLAG == 1;
return IDX.RDB$RELATION_NAME;
}
END_FOR
// msg 48: "Index not found"
status_exception::raise(Arg::PrivateDyn(48));
return ""; // silence warning
}
// Get relation name of an trigger.
static MetaName getTriggerRelationName(thread_db* tdbb, jrd_tra* transaction,
const MetaName& triggerName)
{
AutoCacheRequest request(tdbb, drq_l_trigger_relname, DYN_REQUESTS);
FOR (REQUEST_HANDLE request TRANSACTION_HANDLE transaction)
X IN RDB$TRIGGERS
WITH X.RDB$TRIGGER_NAME EQ triggerName.c_str()
{
return X.RDB$RELATION_NAME;
}
END_FOR
return "";
}
// Get relation type name
static const char* getRelationScopeName(const rel_t type)
{
switch(type)
{
case rel_global_temp_preserve:
return REL_SCOPE_GTT_PRESERVE;
case rel_global_temp_delete:
return REL_SCOPE_GTT_DELETE;
case rel_external:
return REL_SCOPE_EXTERNAL;
case rel_view:
return REL_SCOPE_VIEW;
case rel_virtual:
return REL_SCOPE_VIRTUAL;
}
return REL_SCOPE_PERSISTENT;
}
// Check, can relation of given type be used in FK?
static void checkRelationType(const rel_t type, const MetaName& name)
{
if (type == rel_persistent ||
type == rel_global_temp_preserve ||
type == rel_global_temp_delete)
{
return;
}
string scope;
makeRelationScopeName(scope, name, type);
(Arg::PrivateDyn(289) << scope).raise();
}
// Check, can a pair of relations be used in FK
static void checkFkPairTypes(const rel_t masterType, const MetaName& masterName,
const rel_t childType, const MetaName& childName)
{
if (masterType != childType &&
!(masterType == rel_global_temp_preserve && childType == rel_global_temp_delete))
{
string master, child;
makeRelationScopeName(master, masterName, masterType);
makeRelationScopeName(child, childName, childType);
// Msg 232 : "%s can't reference %s"
status_exception::raise(Arg::PrivateDyn(232) << child << master);
}
}
// Alters the position of a field with respect to the
// other fields in the relation. This will only affect
// the order in which the fields will be returned when either
// viewing the relation or performing select * from the relation.
//
// The rules of engagement are as follows:
// if new_position > original position
// increase RDB$FIELD_POSITION for all fields with RDB$FIELD_POSITION
// between the new_position and existing position of the field
// then update the position of the field being altered.
// just update the position
//
// if new_position < original position
// decrease RDB$FIELD_POSITION for all fields with RDB$FIELD_POSITION
// between the new_position and existing position of the field
// then update the position of the field being altered.
//
// if new_position == original_position -- no_op
static void modifyLocalFieldPosition(thread_db* tdbb, jrd_tra* transaction,
const MetaName& relationName, const MetaName& fieldName, USHORT newPosition)
{
USHORT existingPosition = 0;
bool found = false;
// Make sure that there are no duplicate field positions and no gaps in the position sequence.
// (gaps are introduced when fields are removed)
AutoRequest request;
USHORT newPos = 0;
FOR(REQUEST_HANDLE request TRANSACTION_HANDLE transaction)
FLD IN RDB$RELATION_FIELDS
WITH FLD.RDB$RELATION_NAME EQ relationName.c_str()
SORTED BY ASCENDING FLD.RDB$FIELD_POSITION
{
if (FLD.RDB$FIELD_POSITION != newPos)
{
MODIFY FLD USING
FLD.RDB$FIELD_POSITION = newPos;
END_MODIFY
}
if (fieldName == FLD.RDB$FIELD_NAME)
{
found = true;
existingPosition = newPos;
}
++newPos;
}
END_FOR
if (!found)
{
// msg 176: "column %s does not exist in table/view %s"
status_exception::raise(Arg::PrivateDyn(176) << fieldName << relationName);
}
// Find the position of the last field in the relation.
SLONG maxPosition = SLONG(newPos) - 1;
// If the existing position of the field is less than the new position of
// the field, subtract 1 to move the fields to their new positions otherwise,
// increase the value in RDB$FIELD_POSITION by one.
const bool moveDown = (existingPosition < newPosition);
// Retrieve the records for the fields which have a position between the
// existing field position and the new field position.
request.reset();
FOR(REQUEST_HANDLE request TRANSACTION_HANDLE transaction)
FLD IN RDB$RELATION_FIELDS
WITH FLD.RDB$RELATION_NAME EQ relationName.c_str() AND
FLD.RDB$FIELD_POSITION >= MIN(newPosition, existingPosition) AND
FLD.RDB$FIELD_POSITION <= MAX(newPosition, existingPosition)
{
MODIFY FLD USING
// If the field is the one we want, change the position, otherwise
// increase the value of RDB$FIELD_POSITION.
if (fieldName == FLD.RDB$FIELD_NAME)
{
if (newPosition > maxPosition)
{
// This prevents gaps in the position sequence of the fields.
FLD.RDB$FIELD_POSITION = maxPosition;
}
else
FLD.RDB$FIELD_POSITION = newPosition;
}
else
{
if (moveDown)
FLD.RDB$FIELD_POSITION = FLD.RDB$FIELD_POSITION - 1;
else
FLD.RDB$FIELD_POSITION = FLD.RDB$FIELD_POSITION + 1;
}
FLD.RDB$FIELD_POSITION.NULL = FALSE;
END_MODIFY
}
END_FOR
}
// Convert RDB$RELATION_TYPE to rel_t type.
static rel_t relationType(SSHORT relationTypeNull, SSHORT relationType)
{
return relationTypeNull ? rel_persistent : rel_t(relationType);
}
// Save the name of a field in the relation or view currently being defined. This is done to support
// definition of triggers which will depend on the metadata created in this statement.
static void saveField(thread_db* tdbb, DsqlCompilerScratch* dsqlScratch, const MetaName& fieldName)
{
dsql_rel* relation = dsqlScratch->relation;
if (!relation)
return;
MemoryPool& p = relation->rel_flags & REL_new_relation ?
*tdbb->getDefaultPool() : dsqlScratch->getAttachment()->dbb_pool;
dsql_fld* field = FB_NEW_POOL(p) dsql_fld(p);
field->fld_name = fieldName.c_str();
field->fld_next = relation->rel_fields;
relation->rel_fields = field;
}
// Save the name of the relation or view currently being defined. This is done to support definition
// of triggers which will depend on the metadata created in this statement.
static void saveRelation(thread_db* tdbb, DsqlCompilerScratch* dsqlScratch,
const MetaName& relationName, bool view, bool creating)
{
if (dsqlScratch->flags & DsqlCompilerScratch::FLAG_METADATA_SAVED)
return;
dsqlScratch->flags |= DsqlCompilerScratch::FLAG_METADATA_SAVED;
dsql_rel* relation;
if (!view && !creating)
relation = METD_get_relation(dsqlScratch->getTransaction(), dsqlScratch, relationName);
else
{
MemoryPool& pool = *tdbb->getDefaultPool();
relation = FB_NEW_POOL(pool) dsql_rel(pool);
relation->rel_name = relationName;
if (!view)
relation->rel_flags = REL_creating;
}
dsqlScratch->relation = relation;
}
// Update RDB$FIELDS received by reference.
static void updateRdbFields(const TypeClause* type,
SSHORT& fieldType,
SSHORT& fieldLength,
SSHORT& fieldSubTypeNull, SSHORT& fieldSubType,
SSHORT& fieldScaleNull, SSHORT& fieldScale,
SSHORT& characterSetIdNull, SSHORT& characterSetId,
SSHORT& characterLengthNull, SSHORT& characterLength,
SSHORT& fieldPrecisionNull, SSHORT& fieldPrecision,
SSHORT& collationIdNull, SSHORT& collationId,
SSHORT& segmentLengthNull, SSHORT& segmentLength)
{
// Initialize all nullable fields.
fieldSubTypeNull = fieldScaleNull = characterSetIdNull = characterLengthNull =
fieldPrecisionNull = collationIdNull = segmentLengthNull = TRUE;
if (type->dtype == dtype_blob)
{
fieldSubTypeNull = FALSE;
fieldSubType = type->subType;
fieldScaleNull = FALSE;
fieldScale = 0;
if (type->subType == isc_blob_text)
{
characterSetIdNull = FALSE;
characterSetId = type->charSetId.value;
collationIdNull = FALSE;
collationId = type->collationId;
}
if (type->segLength != 0)
{
segmentLengthNull = FALSE;
segmentLength = type->segLength;
}
}
else if (type->dtype <= dtype_any_text)
{
fieldSubTypeNull = FALSE;
fieldSubType = type->subType;
fieldScaleNull = FALSE;
fieldScale = 0;
if (type->charLength != 0)
{
characterLengthNull = FALSE;
characterLength = type->charLength;
}
characterSetIdNull = FALSE;
characterSetId = type->charSetId.value;
collationIdNull = FALSE;
collationId = type->collationId;
}
else
{
fieldScaleNull = FALSE;
fieldScale = type->scale;
if (DTYPE_IS_EXACT(type->dtype))
{
fieldPrecisionNull = FALSE;
fieldPrecision = type->precision;
fieldSubTypeNull = FALSE;
fieldSubType = type->subType;
}
if (DTYPE_IS_DECFLOAT(type->dtype))
{
fieldPrecisionNull = FALSE;
fieldPrecision = type->precision;
}
}
if (type->dtype == dtype_varying)
{
fb_assert(type->length <= MAX_SSHORT);
fieldLength = (SSHORT) (type->length - sizeof(USHORT));
}
else
fieldLength = type->length;
fieldType = blr_dtypes[type->dtype];
}
//----------------------
// Delete a security class.
bool DdlNode::deleteSecurityClass(thread_db* tdbb, jrd_tra* transaction,
const MetaName& secClass)
{
AutoCacheRequest request(tdbb, drq_e_class, DYN_REQUESTS);
bool found = false;
FOR(REQUEST_HANDLE request TRANSACTION_HANDLE transaction)
SC IN RDB$SECURITY_CLASSES
WITH SC.RDB$SECURITY_CLASS EQ secClass.c_str()
{
found = true;
ERASE SC;
}
END_FOR
return found;
}
void DdlNode::storePrivileges(thread_db* tdbb, jrd_tra* transaction,
const MetaName& name, int type,
const char* privileges)
{
Attachment* const attachment = transaction->tra_attachment;
const MetaString& ownerName = attachment->getEffectiveUserName();
AutoCacheRequest request(tdbb, drq_s_usr_prvs, DYN_REQUESTS);
for (const char* p = privileges; *p; ++p)
{
STORE(REQUEST_HANDLE request TRANSACTION_HANDLE transaction)
X IN RDB$USER_PRIVILEGES
{
strcpy(X.RDB$RELATION_NAME, name.c_str());
strcpy(X.RDB$USER, ownerName.c_str());
X.RDB$USER_TYPE = obj_user;
X.RDB$OBJECT_TYPE = type;
X.RDB$PRIVILEGE[0] = *p;
X.RDB$PRIVILEGE[1] = 0;
X.RDB$GRANT_OPTION = WITH_GRANT_OPTION;
}
END_STORE
}
}
void DdlNode::executeDdlTrigger(thread_db* tdbb, jrd_tra* transaction, DdlTriggerWhen when,
int action, const MetaName& objectName, const MetaName& oldNewObjectName, const string& sqlText)
{
Attachment* const attachment = transaction->tra_attachment;
// do nothing if user doesn't want database triggers
if (attachment->att_flags & ATT_no_db_triggers)
return;
fb_assert(action > 0); // first element is NULL
DdlTriggerContext context;
context.eventType = DDL_TRIGGER_ACTION_NAMES[action][0];
context.objectType = DDL_TRIGGER_ACTION_NAMES[action][1];
context.objectName = objectName;
context.sqlText = sqlText;
if (oldNewObjectName.hasData())
{
context.oldObjectName = when == DTW_BEFORE ? objectName : oldNewObjectName;
context.newObjectName = when == DTW_BEFORE ? oldNewObjectName : objectName;
}
Stack<DdlTriggerContext*>::AutoPushPop autoContext(attachment->ddlTriggersContext, &context);
AutoSavePoint savePoint(tdbb, transaction);
EXE_execute_ddl_triggers(tdbb, transaction, when == DTW_BEFORE, action);
savePoint.release(); // everything is ok
}
void DdlNode::executeDdlTrigger(thread_db* tdbb, DsqlCompilerScratch* dsqlScratch,
jrd_tra* transaction, DdlTriggerWhen when, int action, const MetaName& objectName,
const MetaName& oldNewObjectName)
{
executeDdlTrigger(tdbb, transaction, when, action, objectName, oldNewObjectName,
*dsqlScratch->getStatement()->getSqlText());
}
void DdlNode::storeGlobalField(thread_db* tdbb, jrd_tra* transaction, MetaName& name,
const TypeClause* field, const string& computedSource, const BlrDebugWriter::BlrData& computedValue)
{
Attachment* const attachment = transaction->tra_attachment;
const MetaString& ownerName = attachment->getEffectiveUserName();
const ValueListNode* elements = field->ranges;
const USHORT dims = elements ? elements->items.getCount() / 2 : 0;
if (dims > MAX_ARRAY_DIMENSIONS)
{
status_exception::raise(
Arg::Gds(isc_sqlerr) << Arg::Num(-604) <<
Arg::Gds(isc_dsql_max_arr_dim_exceeded));
}
if (name.isEmpty())
DYN_UTIL_generate_field_name(tdbb, name);
AutoCacheRequest requestHandle(tdbb, drq_s_fld_src, DYN_REQUESTS);
STORE (REQUEST_HANDLE requestHandle TRANSACTION_HANDLE transaction)
FLD IN RDB$FIELDS
{
FLD.RDB$SYSTEM_FLAG = 0;
strcpy(FLD.RDB$FIELD_NAME, name.c_str());