MoreDataMgr.c File Reference
#include "MorePrefix.h"#include "MoreDataMgr.h"#include "MorePrivate.h"Include dependency graph for MoreDataMgr.c:
Go to the source code of this file.
Functions | |
| MemHandle | MDmQueryRecordByID (DmOpenRef dbP, UInt32 recID, Err *errCode, UInt32 *recIdx) |
| Searches a database for a record based on record id. Queries the found record. | |
| MemHandle | MDmGetRecordByID (DmOpenRef dbP, UInt32 recID, Err *errCode, UInt32 *recIdx) |
| Searches a database for a record based on record id. Gets the found record. | |
| Err | MDmReleaseRecordByID (DmOpenRef dbP, UInt32 recID, Boolean dirty, UInt32 *recIdx) |
| Searches a database for a record based on record id. Releases the found record. | |
Function Documentation
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Searches a database for a record based on record id. Gets the found record. Get a record from a database based on record id. If there is no record with that id or an error occurs, NULL is returned. The difference between a query and a get is that a get marks a record as busy. You can not get a busy record. Thus, you should call DmReleaseRecord as soon as possible. You can use MDmReleaseRecordByID or DmReleaseRecord; if convenient, it's more efficient to use DmReleaseRecord. In addition to the function result, this MDmGetRecordByID has two optional returns: errCode - the error that occurred recIdx - the index of the record Required pre-conditions:
Definition at line 48 of file MoreDataMgr.c. 00050 {
00051 MemHandle recH = NULL;
00052 UInt16 idsIdx;
00053 Err err = DmFindRecordByID( dbP, recID, &idsIdx );
00054 _reject( err, failedDmFind );
00055 if ( recIdx )
00056 *recIdx = idsIdx;
00057 recH = DmGetRecord( dbP, idsIdx );
00058 _require( recH, failedDmQuery );
00059 err = errNone;
00060 goto succeed;
00061 failedDmQuery:
00062 err = DmGetLastErr( );
00063 // fall through
00064 failedDmFind:
00065 succeed:
00066 if ( errCode )
00067 *errCode = err;
00068 return recH;
00069 }
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Searches a database for a record based on record id. Queries the found record. Query a record from a database based on record id. If there is no record with that id or an error occurs, NULL is returned. In addition to the function result, this MDmQueryRecordByID has two optional returns: errCode - the error that occurred recIdx - the index of the record Required pre-conditions:
Definition at line 23 of file MoreDataMgr.c. 00025 {
00026 MemHandle recH = NULL;
00027 UInt16 idsIdx;
00028 Err err = DmFindRecordByID( dbP, recID, &idsIdx );
00029 _reject( err, failedDmFind );
00030 if ( recIdx )
00031 *recIdx = idsIdx;
00032 recH = DmQueryRecord( dbP, idsIdx );
00033 _require( recH, failedDmQuery );
00034 err = errNone;
00035 goto succeed;
00036 failedDmQuery:
00037 err = DmGetLastErr( );
00038 // fall through
00039 failedDmFind:
00040 succeed:
00041 if ( errCode )
00042 *errCode = err;
00043 return recH;
00044 }
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Searches a database for a record based on record id. Releases the found record. Releases a record from a database based on record id. If there is no record with that id or an error occurs, an error is returned. Internally, MDmReleaseRecord( ) calls DmFindRecordByID( ) to find the record and DmReleaseRecord to release it. It is more efficient to store the recIdx returned from MDmGetRecordByID( ) and call DmReleaseRecord( ) directly. Definition at line 73 of file MoreDataMgr.c. 00075 {
00076 UInt16 idsIdx;
00077 Err err = DmFindRecordByID( dbP, recID, &idsIdx );
00078 if ( recIdx )
00079 *recIdx = idsIdx;
00080 _reject( err, failedDmFind );
00081 return DmReleaseRecord( dbP, idsIdx, dirty );
00082 failedDmFind:
00083 return err;
00084 }
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