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NCBI C++ ToolKit: src/util/lmdb/mtest.c Source File

19 #define E(expr) CHECK((rc = (expr)) == MDB_SUCCESS, #expr) 20 #define RES(err, expr) ((rc = expr) == (err) || (CHECK(!rc, #expr), 0)) 21 #define CHECK(test, msg) ((test) ? (void)0 : ((void)fprintf(stderr, \ 22  "%s:%d: %s: %s\n"

, __FILE__, __LINE__, msg, mdb_strerror(rc)), abort()))

24 int main

(

int

argc,

char

* argv[])

40  count

= (rand()%384) + 64;

44

values[

i

] = rand()%1024;

55  key

.mv_size =

sizeof

(

int

);

58

printf(

"Adding %d values\n"

,

count

);

60

sprintf(sval,

"%03x %d foo bar"

, values[

i

], values[

i

]);

62  data

.mv_size =

sizeof

(sval);

66  data

.mv_size =

sizeof

(sval);

70  if

(j) printf(

"%d duplicates skipped\n"

, j);

77

printf(

"key: %p %.*s, data: %p %.*s\n"

,

78  key

.mv_data, (

int

)

key

.mv_size, (

char

*)

key

.mv_data,

79  data

.mv_data, (

int

)

data

.mv_size, (

char

*)

data

.mv_data);

87  for

(

i

=

count

- 1;

i

> -1;

i

-= (rand()%5)) {

91

sprintf(sval,

"%03x "

, values[

i

]);

100

printf(

"Deleted %d values\n"

, j);

105

printf(

"Cursor next\n"

);

107

printf(

"key: %.*s, data: %.*s\n"

,

108

(

int

)

key

.mv_size, (

char

*)

key

.mv_data,

109

(

int

)

data

.mv_size, (

char

*)

data

.mv_data);

112

printf(

"Cursor last\n"

);

114

printf(

"key: %.*s, data: %.*s\n"

,

115

(

int

)

key

.mv_size, (

char

*)

key

.mv_data,

116

(

int

)

data

.mv_size, (

char

*)

data

.mv_data);

117

printf(

"Cursor prev\n"

);

119

printf(

"key: %.*s, data: %.*s\n"

,

120

(

int

)

key

.mv_size, (

char

*)

key

.mv_data,

121

(

int

)

data

.mv_size, (

char

*)

data

.mv_data);

124

printf(

"Cursor last/prev\n"

);

126

printf(

"key: %.*s, data: %.*s\n"

,

127

(

int

)

key

.mv_size, (

char

*)

key

.mv_data,

128

(

int

)

data

.mv_size, (

char

*)

data

.mv_data);

130

printf(

"key: %.*s, data: %.*s\n"

,

131

(

int

)

key

.mv_size, (

char

*)

key

.mv_data,

132

(

int

)

data

.mv_size, (

char

*)

data

.mv_data);

137

printf(

"Deleting with cursor\n"

);

140  for

(

i

=0;

i

<50;

i

++) {

143

printf(

"key: %p %.*s, data: %p %.*s\n"

,

144  key

.mv_data, (

int

)

key

.mv_size, (

char

*)

key

.mv_data,

145  data

.mv_data, (

int

)

data

.mv_size, (

char

*)

data

.mv_data);

149

printf(

"Restarting cursor in txn\n"

);

153

printf(

"key: %p %.*s, data: %p %.*s\n"

,

154  key

.mv_data, (

int

)

key

.mv_size, (

char

*)

key

.mv_data,

155  data

.mv_data, (

int

)

data

.mv_size, (

char

*)

data

.mv_data);

160

printf(

"Restarting cursor outside txn\n"

);

166

printf(

"key: %p %.*s, data: %p %.*s\n"

,

167  key

.mv_data, (

int

)

key

.mv_size, (

char

*)

key

.mv_data,

168  data

.mv_data, (

int

)

data

.mv_size, (

char

*)

data

.mv_data);

#define MDB_KEYEXIST

key/data pair already exists

#define MDB_NOTFOUND

key/data pair not found (EOF)

unsigned int

A callback function used to compare two keys in a database.

int mdb_env_open(MDB_env *env, const char *path, unsigned int flags, mdb_mode_t mode)

Open an environment handle.

void mdb_env_close(MDB_env *env)

Close the environment and release the memory map.

int mdb_cursor_get(MDB_cursor *cursor, MDB_val *key, MDB_val *data, MDB_cursor_op op)

Retrieve by cursor.

int mdb_put(MDB_txn *txn, MDB_dbi dbi, MDB_val *key, MDB_val *data, unsigned int flags)

Store items into a database.

void mdb_dbi_close(MDB_env *env, MDB_dbi dbi)

Close a database handle.

void mdb_txn_abort(MDB_txn *txn)

Abandon all the operations of the transaction instead of saving them.

int mdb_txn_commit(MDB_txn *txn)

Commit all the operations of a transaction into the database.

int mdb_cursor_open(MDB_txn *txn, MDB_dbi dbi, MDB_cursor **cursor)

Create a cursor handle.

int mdb_env_set_mapsize(MDB_env *env, size_t size)

Set the size of the memory map to use for this environment.

int mdb_env_create(MDB_env **env)

Create an LMDB environment handle.

int mdb_del(MDB_txn *txn, MDB_dbi dbi, MDB_val *key, MDB_val *data)

Delete items from a database.

int mdb_dbi_open(MDB_txn *txn, const char *name, unsigned int flags, MDB_dbi *dbi)

Open a database in the environment.

void mdb_cursor_close(MDB_cursor *cursor)

Close a cursor handle.

int mdb_txn_begin(MDB_env *env, MDB_txn *parent, unsigned int flags, MDB_txn **txn)

Create a transaction for use with the environment.

MDB_cursor_op

Cursor Get operations.

int mdb_env_set_maxreaders(MDB_env *env, unsigned int readers)

Set the maximum number of threads/reader slots for the environment.

int mdb_env_stat(MDB_env *env, MDB_stat *stat)

Return statistics about the LMDB environment.

@ MDB_LAST

Position at last key/data item.

@ MDB_FIRST

Position at first key/data item.

@ MDB_NEXT

Position at next data item.

@ MDB_PREV

Position at previous data item.

#define MDB_FIXEDMAP

mmap at a fixed address (experimental)

#define MDB_RDONLY

read only

#define MDB_NOOVERWRITE

For put: Don't write if the key already exists.

unsigned int MDB_dbi

A handle for an individual database in the DB environment.

int main(int argc, char *argv[])

const struct ncbi::grid::netcache::search::fields::KEY key

Cursors are used for all DB operations.

The database environment.

Statistics for a database in the environment.

Generic structure used for passing keys and data in and out of the database.

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