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Encapsulates a database stored procedure, providing a uniform API to the common operations related to them. More...
#include <rw/db/stored.h>
Many modern RDBMS implementations include a mechanism to enforce database policy through stored procedures. Applications may be required to do much of their data manipulation through stored procedures. Unfortunately, the standards bodies have had little to say about stored procedures, so implementations vary widely among RDBMS vendors. If an RWDBStoredProc feature is not supported by the underlying database, The DB Interface Module reports an RWDBStatus::notSupported error. The remainder of this section assumes that all features are supported. Check the DB Access Module guide for information about what features are supported by a particular database.
RWDBStoredProc is an encapsulation of a database stored procedure. RWDBStoredProc supports creating and deleting stored procedures, retrieving stored procedures definitions, executing stored procedures, and processing results returned from stored procedure execution. Parameters may be passed to an RWDBStoredProc prior to execution, and the values of output parameters may be retrieved. If a database vendor's stored procedure may return multiple sets of results, RWDBStoredProc can access each result set in turn.
RWDBStoredProc uses an RWDBSchema to store information about its formal parameters. Use the insertion operator operator<<() to pass actual parameters to an RWDBStoredProc. Insert values if the stored procedure expects IN parameters; insert pointers if the stored procedure expects OUT or IN/OUT parameters and your application needs to obtain results through the parameters. Insert rwdbNull to pass a literal NULL by value.
RWDBStoredProc maintains a notion of the current position in its parameter list. The current position is set to zero when the RWDBStoredProc is created, and reset to zero whenever the RWDBStoredProc is executed. Each insertion of an actual parameter increments the current position by one. The indexing operator operator[]() can be used to access a particular parameter position by number or by name. Given a stored procedure myStoredProc that expects the parameters number and name in that order, these notations are equivalent:
RWCString hello("Hello World"); myStoredProc << 1 << hello; myStoredProc[0] << 1; myStoredProc[1] << hello; myStoredProc["name"] << hello; myStoredProc["number"] << 1;
RWDBStoredProc does not check actual parameters for type; it allows the database to do type conversion. If there is a type incompatibility, the DB Interface Module passes along whatever the database reports to the application. The DB Interface Module produces an RWDBStatus::invalidPosition error if too many arguments are inserted into an RWDBStoredProc. No check is made for too few arguments. The database may supply defaults; if not, the DB Interface Module passes along whatever the database reports to the application.
In order to support parameter passing, The DB Interface Module uses a connection to query the database for schema information whenever an RWDBStoredProc is produced by an RWDBDatabase.
RWDBStoredProc is designed around the Interface/Implementation paradigm. An RWDBStoredProc instance is an interface to a reference-counted implementation; copy constructors and assignment operators produce additional references to a shared implementation. An RWDBStoredProc implementation is a base class from which a family of database-specific stored procedure implementations is derived.
#include <rw/db/stored.h> RWDBStoredProc myProc = myDbase.storedProc("myProcName");
In this example, suppose there is a database procedure getId, which expects two parameters: name, an input string representing a customer's name, and id, an output integer parameter representing the customer's id. The procedure is supposed to look up the customer id for the given customer name. If successful, it places the id in its id parameter and returns 0. Otherwise it returns -1 and does not change id.
RWDBStoredProc getId = myDbase.storedProc("getId"); RWCString name("John Doe"); int id; getId << name << &id; getId.execute(); RWDBValue retValue = getId.returnValue(); if (retValue.asInt() == 0) { cout << "John Doe's id is " << id << endl; } else { cout << "Can't find John Doe's id" << endl; }
| RWDBStoredProc::RWDBStoredProc | ( | ) |
The default constructor creates an RWDBStoredProc whose status is RWDBStatus::notInitialized. This constructor is provided as a convenience, for example, for declaring an array of RWDBStoredProc objects. Usable RWDBStoredProc objects are obtained from RWDBDatabase instances.
| RWDBStoredProc::RWDBStoredProc | ( | const RWDBStoredProc & | proc | ) |
Copy constructor. Self shares an implementation with proc.
| void RWDBStoredProc::acquire | ( | ) | const |
Attempts to acquire the internal mutex lock. If the mutex is already locked by another thread, the function blocks until the mutex is released. This function can be called from a const object.
| RWDBStatus RWDBStoredProc::clear | ( | ) |
Clears all internal state.
| RWDBDatabase RWDBStoredProc::database | ( | ) | const |
Returns the RWDBDatabase that produced self. Returns an RWDBDatabase whose status is RWDBStatus::notInitialized, if self was created with the default constructor.
| RWDBStatus RWDBStoredProc::drop | ( | const RWDBConnection & | connection | ) |
Uses the supplied connection to execute the database-specific equivalent of the SQL statement:
DROP PROCEDURE <name>
where <name> is the name of the database stored procedure encapsulated by self. You can check the isValid() method of the return value to see if the operation succeeded. This function can behave asynchronously if executed using an asynchronous connection.
DB XA Module: May generate a server error. This method can still be used before XA connectivity is established.
| RWDBStatus RWDBStoredProc::drop | ( | ) |
Uses a default database connection to execute the database-specific equivalent of the SQL statement:
DROP PROCEDURE <name>
where <name> is the name of the database stored procedure encapsulated by self. You can check the isValid() method of the return value to see if the operation succeeded.
DB XA Module: May generate a server error. This method can still be used before XA connectivity is established.
| RWDBStatus::ErrorHandler RWDBStoredProc::errorHandler | ( | ) | const |
Returns the error handler attached to self.
| RWDBResult RWDBStoredProc::execute | ( | const RWDBConnection & | connection | ) |
Uses the supplied connection to execute the stored procedure encapsulated by self. The connection is held by the RWDBResult until the RWDBResult is destroyed. The connection is also held by self until either fetchReturnParams() or returnValue() is called, or the RWDBStoredProc is destroyed. This function can behave asynchronously if executed using an asynchronous connection.
| RWDBResult RWDBStoredProc::execute | ( | ) |
Uses a default database connection to execute the stored procedure encapsulated by self. The connection is held by the RWDBResult until the RWDBResult is destroyed. The connection is also held by self until either fetchReturnParams() or returnValue() is called, or the RWDBStoredProc is destroyed.
| bool RWDBStoredProc::exists | ( | const RWDBConnection & | connection, | |
| bool | forceLookup = false | |||
| ) | const |
Returns true if the stored procedure encapsulated by self exists in the database. The result is cached in self. If self's internal cache is empty, or if forceLookup is true, uses the supplied connection to obtain the information from the database, otherwise returns the cached information. If an error occurs, returns false.
| bool RWDBStoredProc::exists | ( | bool | forceLookup = false |
) | const |
Returns true if the stored procedure encapsulated by self exists in the database. The result is cached in self. If self's internal cache is empty, or if forceLookup is true, uses a default database connection to obtain the information from the database, otherwise returns the cached information. If an error occurs, returns false.
| RWDBStatus RWDBStoredProc::fetchReturnParams | ( | ) |
The connection used by the last call to execute() is used to obtain any output parameters returned by the database stored procedure. If execute() has not yet been successfully invoked, sets self's status and returns RWDBStatus::notConnected. Some databases do not support return parameters, in this case RWDBStatus::notSupported is returned. This function behaves asynchronously if the stored procedure was created using an asynchronous connection.
| bool RWDBStoredProc::isNull | ( | size_t | index | ) | const |
Returns true if the last value fetched into the output parameter at position index was NULL. Otherwise returns false. If there is no such output parameter at index, self's status changes to RWDBStatus::invalidPosition.
| bool RWDBStoredProc::isNull | ( | const RWCString & | name | ) | const |
Returns true if the last value fetched into the output parameter with the given name was NULL. Otherwise returns false. If there is no such output parameter with that given name, self's status changes to RWDBStatus::invalidPosition.
| bool RWDBStoredProc::isNull | ( | const RWDBColumn & | column | ) | const |
Returns true if the last value fetched into the output parameter with the same name as column was NULL. Otherwise returns false. If there is no such output parameter with the same name, self's status changes to RWDBStatus::invalidPosition.
| bool RWDBStoredProc::isReady | ( | ) | const |
This function returns true if the object is in ready state, indicating that accessing the object will not block. Accessing a nonready object may potentially block.
| bool RWDBStoredProc::isValid | ( | ) | const |
Returns true if self's status is RWDBStatus::ok, otherwise returns false.
| RWCString RWDBStoredProc::name | ( | ) | const |
Returns self's name.
| RWDBStoredProc& RWDBStoredProc::operator<< | ( | RWWString * | valPtr | ) |
Passes valPtr as the nth parameter to self, where n is the current position in self's formal parameter list, and increments the current position by 1. The parameter is passed by reference. After executing the stored procedure, the variable addressed by valPtr is updated by calling either fetchReturnParams() or returnValue().
| RWDBStoredProc& RWDBStoredProc::operator<< | ( | RWBasicUString * | valPtr | ) |
Passes valPtr as the nth parameter to self, where n is the current position in self's formal parameter list, and increments the current position by 1. The parameter is passed by reference. After executing the stored procedure, the variable addressed by valPtr is updated by calling either fetchReturnParams() or returnValue().
| RWDBStoredProc& RWDBStoredProc::operator<< | ( | RWDBMBString * | valPtr | ) |
Passes valPtr as the nth parameter to self, where n is the current position in self's formal parameter list, and increments the current position by 1. The parameter is passed by reference. After executing the stored procedure, the variable addressed by valPtr is updated by calling either fetchReturnParams() or returnValue().
| RWDBStoredProc& RWDBStoredProc::operator<< | ( | RWCString * | valPtr | ) |
Passes valPtr as the nth parameter to self, where n is the current position in self's formal parameter list, and increments the current position by 1. The parameter is passed by reference. After executing the stored procedure, the variable addressed by valPtr is updated by calling either fetchReturnParams() or returnValue().
| RWDBStoredProc& RWDBStoredProc::operator<< | ( | RWDBBlob * | valPtr | ) |
Passes valPtr as the nth parameter to self, where n is the current position in self's formal parameter list, and increments the current position by 1. The parameter is passed by reference. After executing the stored procedure, the variable addressed by valPtr is updated by calling either fetchReturnParams() or returnValue().
| RWDBStoredProc& RWDBStoredProc::operator<< | ( | RWDBDuration * | valPtr | ) |
Passes valPtr as the nth parameter to self, where n is the current position in self's formal parameter list, and increments the current position by 1. The parameter is passed by reference. After executing the stored procedure, the variable addressed by valPtr is updated by calling either fetchReturnParams() or returnValue().
| RWDBStoredProc& RWDBStoredProc::operator<< | ( | RWDBDateTime * | valPtr | ) |
Passes valPtr as the nth parameter to self, where n is the current position in self's formal parameter list, and increments the current position by 1. The parameter is passed by reference. After executing the stored procedure, the variable addressed by valPtr is updated by calling either fetchReturnParams() or returnValue().
| RWDBStoredProc& RWDBStoredProc::operator<< | ( | RWDateTime * | valPtr | ) |
Passes valPtr as the nth parameter to self, where n is the current position in self's formal parameter list, and increments the current position by 1. The parameter is passed by reference. After executing the stored procedure, the variable addressed by valPtr is updated by calling either fetchReturnParams() or returnValue().
| RWDBStoredProc& RWDBStoredProc::operator<< | ( | RWDate * | valPtr | ) |
Passes valPtr as the nth parameter to self, where n is the current position in self's formal parameter list, and increments the current position by 1. The parameter is passed by reference. After executing the stored procedure, the variable addressed by valPtr is updated by calling either fetchReturnParams() or returnValue().
| RWDBStoredProc& RWDBStoredProc::operator<< | ( | RWDecimalPortable * | valPtr | ) |
Passes valPtr as the nth parameter to self, where n is the current position in self's formal parameter list, and increments the current position by 1. The parameter is passed by reference. After executing the stored procedure, the variable addressed by valPtr is updated by calling either fetchReturnParams() or returnValue().
| RWDBStoredProc& RWDBStoredProc::operator<< | ( | long double * | valPtr | ) |
Passes valPtr as the nth parameter to self, where n is the current position in self's formal parameter list, and increments the current position by 1. The parameter is passed by reference. After executing the stored procedure, the variable addressed by valPtr is updated by calling either fetchReturnParams() or returnValue().
| RWDBStoredProc& RWDBStoredProc::operator<< | ( | double * | valPtr | ) |
Passes valPtr as the nth parameter to self, where n is the current position in self's formal parameter list, and increments the current position by 1. The parameter is passed by reference. After executing the stored procedure, the variable addressed by valPtr is updated by calling either fetchReturnParams() or returnValue().
| RWDBStoredProc& RWDBStoredProc::operator<< | ( | float * | valPtr | ) |
Passes valPtr as the nth parameter to self, where n is the current position in self's formal parameter list, and increments the current position by 1. The parameter is passed by reference. After executing the stored procedure, the variable addressed by valPtr is updated by calling either fetchReturnParams() or returnValue().
| RWDBStoredProc& RWDBStoredProc::operator<< | ( | unsigned long long * | valPtr | ) |
Passes valPtr as the nth parameter to self, where n is the current position in self's formal parameter list, and increments the current position by 1. The parameter is passed by reference. After executing the stored procedure, the variable addressed by valPtr is updated by calling either fetchReturnParams() or returnValue().
| RWDBStoredProc& RWDBStoredProc::operator<< | ( | long long * | valPtr | ) |
Passes valPtr as the nth parameter to self, where n is the current position in self's formal parameter list, and increments the current position by 1. The parameter is passed by reference. After executing the stored procedure, the variable addressed by valPtr is updated by calling either fetchReturnParams() or returnValue().
| RWDBStoredProc& RWDBStoredProc::operator<< | ( | unsigned long * | valPtr | ) |
Passes valPtr as the nth parameter to self, where n is the current position in self's formal parameter list, and increments the current position by 1. The parameter is passed by reference. After executing the stored procedure, the variable addressed by valPtr is updated by calling either fetchReturnParams() or returnValue().
| RWDBStoredProc& RWDBStoredProc::operator<< | ( | long * | valPtr | ) |
Passes valPtr as the nth parameter to self, where n is the current position in self's formal parameter list, and increments the current position by 1. The parameter is passed by reference. After executing the stored procedure, the variable addressed by valPtr is updated by calling either fetchReturnParams() or returnValue().
| RWDBStoredProc& RWDBStoredProc::operator<< | ( | unsigned int * | valPtr | ) |
Passes valPtr as the nth parameter to self, where n is the current position in self's formal parameter list, and increments the current position by 1. The parameter is passed by reference. After executing the stored procedure, the variable addressed by valPtr is updated by calling either fetchReturnParams() or returnValue().
| RWDBStoredProc& RWDBStoredProc::operator<< | ( | int * | valPtr | ) |
Passes valPtr as the nth parameter to self, where n is the current position in self's formal parameter list, and increments the current position by 1. The parameter is passed by reference. After executing the stored procedure, the variable addressed by valPtr is updated by calling either fetchReturnParams() or returnValue().
| RWDBStoredProc& RWDBStoredProc::operator<< | ( | unsigned short * | valPtr | ) |
Passes valPtr as the nth parameter to self, where n is the current position in self's formal parameter list, and increments the current position by 1. The parameter is passed by reference. After executing the stored procedure, the variable addressed by valPtr is updated by calling either fetchReturnParams() or returnValue().
| RWDBStoredProc& RWDBStoredProc::operator<< | ( | short * | valPtr | ) |
Passes valPtr as the nth parameter to self, where n is the current position in self's formal parameter list, and increments the current position by 1. The parameter is passed by reference. After executing the stored procedure, the variable addressed by valPtr is updated by calling either fetchReturnParams() or returnValue().
| RWDBStoredProc& RWDBStoredProc::operator<< | ( | const RWDBBoundExpr & | value | ) |
Inserts a placeholder and performs binding for in-type parameters. Here in-type binding includes in/out binding. The meaning of shifting in an RWDBBoundExpr with entries greater than 1 is vendor-dependent.
| RWDBStoredProc& RWDBStoredProc::operator<< | ( | const RWDBBlob & | value | ) |
Passes value as the nth parameter to self, where n is the current position in self's formal parameter list, and increments the current position by one. The parameter is passed by value.
| RWDBStoredProc& RWDBStoredProc::operator<< | ( | const RWWString & | value | ) |
Passes value as the nth parameter to self, where n is the current position in self's formal parameter list, and increments the current position by one. The parameter is passed by value.
| RWDBStoredProc& RWDBStoredProc::operator<< | ( | const RWBasicUString & | value | ) |
Passes value as the nth parameter to self, where n is the current position in self's formal parameter list, and increments the current position by one. The parameter is passed by value.
| RWDBStoredProc& RWDBStoredProc::operator<< | ( | const RWDBMBString & | value | ) |
Passes value as the nth parameter to self, where n is the current position in self's formal parameter list, and increments the current position by one. The parameter is passed by value.
| RWDBStoredProc& RWDBStoredProc::operator<< | ( | const RWCString & | value | ) |
Passes value as the nth parameter to self, where n is the current position in self's formal parameter list, and increments the current position by one. The parameter is passed by value.
| RWDBStoredProc& RWDBStoredProc::operator<< | ( | const RWDBDuration & | value | ) |
Passes value as the nth parameter to self, where n is the current position in self's formal parameter list, and increments the current position by one. The parameter is passed by value.
| RWDBStoredProc& RWDBStoredProc::operator<< | ( | const RWDBDateTime & | value | ) |
Passes value as the nth parameter to self, where n is the current position in self's formal parameter list, and increments the current position by one. The parameter is passed by value.
| RWDBStoredProc& RWDBStoredProc::operator<< | ( | const RWDateTime & | value | ) |
Passes value as the nth parameter to self, where n is the current position in self's formal parameter list, and increments the current position by one. The parameter is passed by value.
| RWDBStoredProc& RWDBStoredProc::operator<< | ( | const RWDate & | value | ) |
Passes value as the nth parameter to self, where n is the current position in self's formal parameter list, and increments the current position by one. The parameter is passed by value.
| RWDBStoredProc& RWDBStoredProc::operator<< | ( | const RWDecimalPortable & | value | ) |
Passes value as the nth parameter to self, where n is the current position in self's formal parameter list, and increments the current position by one. The parameter is passed by value.
| RWDBStoredProc& RWDBStoredProc::operator<< | ( | long double | value | ) |
Passes value as the nth parameter to self, where n is the current position in self's formal parameter list, and increments the current position by one. The parameter is passed by value.
| RWDBStoredProc& RWDBStoredProc::operator<< | ( | double | value | ) |
Passes value as the nth parameter to self, where n is the current position in self's formal parameter list, and increments the current position by one. The parameter is passed by value.
| RWDBStoredProc& RWDBStoredProc::operator<< | ( | float | value | ) |
Passes value as the nth parameter to self, where n is the current position in self's formal parameter list, and increments the current position by one. The parameter is passed by value.
| RWDBStoredProc& RWDBStoredProc::operator<< | ( | unsigned long long | value | ) |
Passes value as the nth parameter to self, where n is the current position in self's formal parameter list, and increments the current position by one. The parameter is passed by value.
| RWDBStoredProc& RWDBStoredProc::operator<< | ( | long long | value | ) |
Passes value as the nth parameter to self, where n is the current position in self's formal parameter list, and increments the current position by one. The parameter is passed by value.
| RWDBStoredProc& RWDBStoredProc::operator<< | ( | unsigned long | value | ) |
Passes value as the nth parameter to self, where n is the current position in self's formal parameter list, and increments the current position by one. The parameter is passed by value.
| RWDBStoredProc& RWDBStoredProc::operator<< | ( | long | value | ) |
Passes value as the nth parameter to self, where n is the current position in self's formal parameter list, and increments the current position by one. The parameter is passed by value.
| RWDBStoredProc& RWDBStoredProc::operator<< | ( | unsigned int | value | ) |
Passes value as the nth parameter to self, where n is the current position in self's formal parameter list, and increments the current position by one. The parameter is passed by value.
| RWDBStoredProc& RWDBStoredProc::operator<< | ( | int | value | ) |
Passes value as the nth parameter to self, where n is the current position in self's formal parameter list, and increments the current position by one. The parameter is passed by value.
| RWDBStoredProc& RWDBStoredProc::operator<< | ( | unsigned short | value | ) |
Passes value as the nth parameter to self, where n is the current position in self's formal parameter list, and increments the current position by one. The parameter is passed by value.
| RWDBStoredProc& RWDBStoredProc::operator<< | ( | short | value | ) |
Passes value as the nth parameter to self, where n is the current position in self's formal parameter list, and increments the current position by one. The parameter is passed by value.
| RWDBStoredProc& RWDBStoredProc::operator<< | ( | unsigned char | value | ) |
Passes value as the nth parameter to self, where n is the current position in self's formal parameter list, and increments the current position by one. The parameter is passed by value.
| RWDBStoredProc& RWDBStoredProc::operator<< | ( | char | value | ) |
Passes value as the nth parameter to self, where n is the current position in self's formal parameter list, and increments the current position by one. The parameter is passed by value.
| RWDBStoredProc& RWDBStoredProc::operator<< | ( | const RWDBValue & | value | ) |
Passes value as the nth parameter to self, where n is the current position in self's formal parameter list, and increments the current position by one. The parameter is passed by value.
| RWDBStoredProc& RWDBStoredProc::operator<< | ( | RWDBValueManip | value | ) |
Passes value as the nth parameter to self, where n is the current position in self's formal parameter list, and increments the current position by one. The parameter is passed by value.
| RWDBStoredProc& RWDBStoredProc::operator= | ( | const RWDBStoredProc & | proc | ) |
Assignment operator. Self shares an implementation with proc.
| RWDBStoredProc& RWDBStoredProc::operator[] | ( | size_t | index | ) |
Self's current row position is set to index. If index is greater than or equal to the number of parameters expected by self, self's status is changed to RWDBStatus::invalidPosition. Returns a reference to self.
| RWDBStoredProc& RWDBStoredProc::operator[] | ( | const RWCString & | paramName | ) |
Self's current row position is set to the index in self's schema of the first parameter whose name is paramName. If there is no such parameter, self's status changes to RWDBStatus::invalidPosition. Returns a reference to self.
| RWDBStoredProc& RWDBStoredProc::operator[] | ( | const RWDBColumn & | paramColumn | ) |
Self's current row position is set to the index in self's schema of the first parameter whose name matches that of paramColumn. If there is no such parameter, self's status changes to RWDBStatus::invalidPosition. Returns reference to self.
| RWDBSchema RWDBStoredProc::params | ( | const RWDBConnection & | connection, | |
| bool | forceLookup = false | |||
| ) | const |
Returns an RWDBSchema, which represents self's formal parameter list. The result is cached in self. If self's internal cache is empty, or if forceLookup is true, the supplied connection is used to obtain schema from the database. Otherwise, returns the cached schema. Returns an empty schema if self has no parameters or if an error occurs. In the latter case, sets self's status to reflect the error.
| RWDBSchema RWDBStoredProc::params | ( | bool | forceLookup = false |
) | const |
Returns an RWDBSchema which represents self's formal parameter list. The result is cached in self. If self's internal cache is empty, or if forceLookup is true, a default database connection is used to obtain schema from the database. Otherwise, returns the cached schema. Returns an empty schema if self has no parameters or if an error occurs. In the latter case, sets self's status to reflect the error.
| void RWDBStoredProc::release | ( | ) | const |
Releases a previously acquired mutex. This function can be called from a const object.
| RWDBValue RWDBStoredProc::returnValue | ( | ) | const |
Calls fetchReturnParams(), then, if no error has occurred, obtains the return value of the most recent execution of self in the database and returns it. If there is no return value, or if an error has occurred, returns a NULL RWDBValue. In the latter case sets self's status to reflect the error.
| void RWDBStoredProc::setErrorHandler | ( | RWDBStatus::ErrorHandler | handler | ) |
Installs handler as self's error handler. The supplied handler is inherited by all objects produced by self. By default, an RWDBStatus::ErrorHandler is inherited from the object which produced self; this method overrides the default.
| RWDBStatus RWDBStoredProc::status | ( | ) | const |
Returns the current status of self.
| RWCString RWDBStoredProc::text | ( | const RWDBConnection & | connection, | |
| bool | forceLookup = false | |||
| ) | const |
Returns the SQL text used to define the stored procedure encapsulated by self. The result is cached in self. If self's internal cache is empty, or if forceLookup is true, the supplied connection is used to obtain the SQL text from the database. Otherwise, returns the cached text. If unsuccessful, returns an empty string and sets self's status to reflect the error.
| RWCString RWDBStoredProc::text | ( | bool | forceLookup = false |
) | const |
Returns the SQL text used to define the stored procedure encapsulated by self. The result is cached in self. If self's internal cache is empty, or if forceLookup is true, a default database connection is used to obtain the SQL text from the database. Otherwise, returns the cached text. If unsuccessful, returns an empty string and sets self's status to reflect the error.
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