Berkeley DB: DBcursor->c_del
Description: Berkeley DB: An embedded database programmatic toolkit.
Keywords: embedded,database,programmatic,toolkit,b+tree,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,java,C,C++

# DBcursor->c_del |

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    #include <db.h>

    int
    DBcursor->c_del(DBC *cursor, u_int32_t flags);

# Description

The DBcursor->c_del function deletes the key/data pair to which the cursor refers.

When called on a cursor opened on a database that has been made into a secondary index using the DB->associate function, the DB->del function deletes the key/data pair from the primary database and all secondary indices.

The flags parameter is currently unused, and must be set to 0.

The cursor position is unchanged after a delete, and subsequent calls to cursor functions expecting the cursor to refer to an existing key will fail.

If the element has already been deleted, DBcursor->c_del will return DB_KEYEMPTY.

If the cursor is not yet initialized, the DBcursor->c_del function will return EINVAL.

Otherwise, the DBcursor->c_del function returns a non-zero error value on failure and 0 on success.

# Errors

The DBcursor->c_del function may fail and return a non-zero error for the following conditions:

DB_LOCK_DEADLOCK
  The operation was selected to resolve a deadlock.

DB_SECONDARY_BAD
  A secondary index references a nonexistent primary key.

EACCES
  An attempt was made to modify a read-only database.

EINVAL
  An invalid flag value or parameter was specified.

EPERM
  Write attempted on read-only cursor when the DB_INIT_CDB flag was specified to DB_ENV->open.

The DBcursor->c_del function may fail and return a non-zero error for errors specified for other Berkeley DB and C library or system functions. If a catastrophic error has occurred, the DBcursor->c_del function may fail and return DB_RUNRECOVERY, in which case all subsequent Berkeley DB calls will fail in the same way.

# See Also

DBcursor->c_close, DBcursor->c_count, DBcursor->c_del, DBcursor->c_dup, DBcursor->c_get, DBcursor->c_pget, and DBcursor->c_put.`

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