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nexedi
MariaDB
Commits
f2596861
Commit
f2596861
authored
Dec 30, 2004
by
jon@gigan
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Got rid of <code> tags in doxygen comments for mgmapi.h
and ndbapi.hpp as they look like crap when converted to PDF.
parent
1ca06912
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-47
ndb/include/mgmapi/mgmapi.h
ndb/include/mgmapi/mgmapi.h
+2
-2
ndb/include/ndbapi/Ndb.hpp
ndb/include/ndbapi/Ndb.hpp
+43
-45
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ndb/include/mgmapi/mgmapi.h
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f2596861
...
...
@@ -30,9 +30,9 @@
* @section General Concepts
*
* Each MGM API function needs a management server handle
* of type
<code>Mgm_C_Api::NdbMgmHandle</code>
.
* of type
Mgm_C_Api::NdbMgmHandle
.
* This handle is initally created by calling the
* function
<code>ndb_mgm_create_handle()</code>
.
* function
ndb_mgm_create_handle()
.
*
* A function can return:
* -# An integer value.
...
...
ndb/include/ndbapi/Ndb.hpp
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f2596861
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@@ -23,31 +23,31 @@
The <em>NDB API</em> is a MySQL Cluster application interface
that implements transactions.
The NDB API consists of the following fundamental classes:
-
<code>Ndb_cluster_connection</code>
, representing a connection to a cluster,
-
<code>Ndb</code>
is the main class, representing the database,
-
<code>NdbTransaction</code>
represents a transaction,
-
<code>NdbOperation</code>
represents an operation using a primary key,
-
<code>NdbScanOperation</code>
represents an operation performing a full table scan.
-
<code>NdbIndexOperation</code>
represents an operation using a unique hash index,
-
<code>NdbIndexScanOperation</code>
represents an operation performing a scan using
-
Ndb_cluster_connection
, representing a connection to a cluster,
-
Ndb
is the main class, representing the database,
-
NdbTransaction
represents a transaction,
-
NdbOperation
represents an operation using a primary key,
-
NdbScanOperation
represents an operation performing a full table scan.
-
NdbIndexOperation
represents an operation using a unique hash index,
-
NdbIndexScanOperation
represents an operation performing a scan using
an ordered index,
-
<code>NdbRecAttr</code>
represents an attribute value
-
<code>NdbDictionary</code>
represents meta information about tables and attributes.
-
<code>NdbError</code>
contains the specification for an error.
-
NdbRecAttr
represents an attribute value
-
NdbDictionary
represents meta information about tables and attributes.
-
NdbError
contains the specification for an error.
There are also some auxiliary classes.
The main structure of an application program is as follows:
-# Construct and connect to a cluster using the
<code>Ndb_cluster_connection</code>
-# Construct and connect to a cluster using the
Ndb_cluster_connection
object.
-# Construct and initialize
<code>Ndb</code>
object(s).
-# Define and execute transactions using
<code>NdbTransaction</code> and <code>Ndb*Operation</code>
.
-# Delete
<code>Ndb</code>
objects
-# Construct and initialize
Ndb
object(s).
-# Define and execute transactions using
NdbTransaction and Ndb*Operation
.
-# Delete
Ndb
objects
-# Delete cluster connection
The main structure of a transaction is as follows:
-# Start transaction (an
<code>NdbTransaction</code>
)
-# Start transaction (an
NdbTransaction
)
-# Add and define operations associated with the transaction using
<code>Ndb*Operation</code>
Ndb*Operation
-# Execute transaction
The execution can be of two different types,
...
...
@@ -69,41 +69,41 @@
Synchronous transactions are defined and executed as follows:
-# Start (create) the transaction, which is
referenced by an
<code>NdbTransaction</code>
object
(typically created using
<code>Ndb::startTransaction()</code>
).
referenced by an
NdbTransaction
object
(typically created using
Ndb::startTransaction()
).
At this point, the transaction is only being defined,
and is not yet sent to the NDB kernel.
-# Define operations and add them to the transaction,
using
<code>NdbTransaction::getNdb*Operation()</code>
and
methods of the
<code>Ndb*Operation</code>
class.
using
NdbTransaction::getNdb*Operation()
and
methods of the
Ndb*Operation
class.
Note that the transaction has still not yet been sent to the NDB kernel.
-# Execute the transaction, using the
<code>NdbTransaction::execute()</code>
method.
-# Close the transaction (using
<code>Ndb::closeTransaction()</code>
).
-# Execute the transaction, using the
NdbTransaction::execute()
method.
-# Close the transaction (using
Ndb::closeTransaction()
).
For an example of this process, see the program listing in @ref ndbapi_example1.cpp.
To execute several parallel synchronous transactions, one can either
use multiple
<code>Ndb</code>
objects in several threads, or start multiple
use multiple
Ndb
objects in several threads, or start multiple
applications programs.
@section secNdbOperations Operations
Each
<code>NdbTransaction</code>
Each
NdbTransaction
consists of a list of operations which are represented by instances
of
<code>Ndb*Operation</code>
.
of
Ndb*Operation
.
<h3>Single row operations</h3>
After the operation is created using
<code>NdbTransaction::getNdbOperation()</code>
(or
<code>NdbTransaction::getNdbIndexOperation()</code>
), it is defined in the following
After the operation is created using
NdbTransaction::getNdbOperation()
(or
NdbTransaction::getNdbIndexOperation()
), it is defined in the following
three steps:
-# Define the standard operation type, using
<code>NdbOperation::readTuple()</code>
-# Specify search conditions, using
<code>NdbOperation::equal()</code>
-# Specify attribute actions, using
<code>NdbOperation::getValue()</code>
-# Define the standard operation type, using
NdbOperation::readTuple()
-# Specify search conditions, using
NdbOperation::equal()
-# Specify attribute actions, using
NdbOperation::getValue()
Here are two brief examples illustrating this process. For the sake of brevity,
we omit error-handling.
This first example uses an
<code>NdbOperation</code>
:
This first example uses an
NdbOperation
:
@code
// 1. Create
MyOperation= MyTransaction->getNdbOperation("MYTABLENAME");
...
...
@@ -120,7 +120,7 @@
For additional examples of this sort, see @ref ndbapi_example1.cpp and
@ref ndbapi_example2.cpp.
The second example uses an
<code>NdbIndexOperation</code>
:
The second example uses an
NdbIndexOperation
:
@code
// 1. Create
MyOperation= MyTransaction->getNdbIndexOperation("MYINDEX", "MYTABLENAME");
...
...
@@ -139,8 +139,6 @@
We will now discuss in somewhat greater detail each step involved in the creation
and use of synchronous transactions.
// Edit stop point - JS, 20041228 0425+1000
<h4>Step 1: Define single row operation type</h4>
The following types of operations exist:
-# NdbOperation::insertTuple :
...
...
@@ -211,19 +209,19 @@
- They can be used to update or delete multiple rows
- They can operate on several nodes in parallell
After the operation is created using
<code>NdbTransaction::getNdbScanOperation()</code>
(or
<code>NdbTransaction::getNdbIndexScanOperation()</code>
), it is defined in the following
After the operation is created using
NdbTransaction::getNdbScanOperation()
(or
NdbTransaction::getNdbIndexScanOperation()
), it is defined in the following
three steps:
-# Define the standard operation type, using
<code>NdbScanOperation::readTuples()</code>
-# Define the standard operation type, using
NdbScanOperation::readTuples()
-# Specify search conditions, using @ref NdbScanFilter and/or @ref NdbIndexScanOperation::setBound
-# Specify attribute actions, using
<code>NdbOperation::getValue()</code>
-# Executing the transaction, using
<code>NdbTransaction::execute()</code>
-# Iterating through the result set using
<code>NdbScanOperation::nextResult</code>
-# Specify attribute actions, using
NdbOperation::getValue()
-# Executing the transaction, using
NdbTransaction::execute()
-# Iterating through the result set using
NdbScanOperation::nextResult
Here are two brief examples illustrating this process. For the sake of brevity,
we omit error-handling.
This first example uses an
<code>NdbScanOperation</code>
:
This first example uses an
NdbScanOperation
:
@code
// 1. Create
MyOperation= MyTransaction->getNdbScanOperation("MYTABLENAME");
...
...
@@ -242,7 +240,7 @@
MyRecAttr= MyOperation->getValue("ATTR2", NULL);
@endcode
The second example uses an
<code>NdbIndexScanOperation</code>
:
The second example uses an
NdbIndexScanOperation
:
@code
// 1. Create
MyOperation= MyTransaction->getNdbIndexScanOperation("MYORDEREDINDEX", "MYTABLENAME");
...
...
@@ -309,7 +307,7 @@
-# When iterating through the result set, for each row optionally call
either NdbScanOperation::updateCurrentTuple or
NdbScanOperation::deleteCurrentTuple
-# If performing
<code>NdbScanOperation::updateCurrentTuple</code>
,
-# If performing
NdbScanOperation::updateCurrentTuple
,
set new values on record using ordinary @ref NdbOperation::setValue.
NdbOperation::equal should _not_ be called as the primary key is
retreived from the scan.
...
...
@@ -337,10 +335,10 @@
But Ndb will only lock a batch of rows per fragment at a time.
How many rows will be locked per fragment is controlled by the
<code>batch</code>
parameter to @ref NdbScanOperation::readTuples.
batch
parameter to @ref NdbScanOperation::readTuples.
To let the application handle how locks are released
@ref NdbScanOperation::nextResult have a parameter
<code>fetch_allow</code>
.
@ref NdbScanOperation::nextResult have a parameter
fetch_allow
.
If NdbScanOperation::nextResult is called with fetch_allow = false, no
locks may be released as result of the function call. Otherwise the locks
for the current batch may be released.
...
...
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