git.m6w6.name Git - awesomized/libmemcached/blob - docs/man/memcached_result_value.3

   1 .TH "MEMCACHED_RESULT_VALUE" "3" "April 28, 2012" "1.0.7" "libmemcached"
   2 .SH NAME
   3 memcached_result_value \- Working with result sets
   4 .
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  32 .
  33 .SH SYNOPSIS
  34 .sp
  35 #include <libmemcached/memcached_pool.h>
  36 .INDENT 0.0
  37 .TP
  38 .B memcached_result_st
  39 .UNINDENT
  40 .INDENT 0.0
  41 .TP
  42 .B \fI\%memcached_result_st\fP * memcached_result_create(memcached_st\fI\ *ptr\fP, \fI\%memcached_result_st\fP\fI\ *result\fP)
  43 .UNINDENT
  44 .INDENT 0.0
  45 .TP
  46 .B void memcached_result_free(\fI\%memcached_result_st\fP\fI\ *result\fP)
  47 .UNINDENT
  48 .INDENT 0.0
  49 .TP
  50 .B const char * memcached_result_key_value(\fI\%memcached_result_st\fP\fI\ *result\fP)
  51 .UNINDENT
  52 .INDENT 0.0
  53 .TP
  54 .B size_t memcached_result_key_length(const \fI\%memcached_result_st\fP\fI\ *result\fP)
  55 .UNINDENT
  56 .INDENT 0.0
  57 .TP
  58 .B const char *memcached_result_value(\fI\%memcached_result_st\fP\fI\ *ptr\fP)
  59 .UNINDENT
  60 .INDENT 0.0
  61 .TP
  62 .B size_t memcached_result_length(const \fI\%memcached_result_st\fP\fI\ *ptr\fP)
  63 .UNINDENT
  64 .INDENT 0.0
  65 .TP
  66 .B uint32_t memcached_result_flags(const \fI\%memcached_result_st\fP\fI\ *result\fP)
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  69 .TP
  70 .B uint64_t memcached_result_cas(const \fI\%memcached_result_st\fP\fI\ *result\fP)
  71 .UNINDENT
  72 .INDENT 0.0
  73 .TP
  74 .B memcached_return_t memcached_result_set_value(\fI\%memcached_result_st\fP\fI\ *ptr\fP, const char\fI\ *value\fP, size_t\fI\ length\fP)
  75 .UNINDENT
  76 .INDENT 0.0
  77 .TP
  78 .B void memcached_result_set_flags(\fI\%memcached_result_st\fP\fI\ *ptr\fP, uint32_t\fI\ flags\fP)
  79 .UNINDENT
  80 .INDENT 0.0
  81 .TP
  82 .B void memcached_result_set_expiration(\fI\%memcached_result_st\fP\fI\ *ptr\fP, time_t)
  83 .UNINDENT
  84 .sp
  85 Compile and link with \-lmemcachedutil \-lmemcached
  86 .SH DESCRIPTION
  87 .sp
  88 libmemcached(3) can optionally return a \fI\%memcached_result_st\fP which
  89 acts as a result object. The result objects have added benefits over the
  90 character pointer returns, in that they are forward compatible with new
  91 return items that future memcached servers may implement (the best current
  92 example of this is the CAS return item). The structures can also be reused,
  93 which will save on calls to malloc(3). It is suggested that you use result
  94 objects over char * return functions.
  95 .sp
  96 The structure of \fI\%memcached_result_st\fP has been encapsulated, you should
  97 not write code to directly access members of the structure.
  98 .sp
  99 \fI\%memcached_result_create()\fP will either allocate memory for a
 100 \fI\%memcached_result_st\fP or will initialize a structure passed to it.
 101 .sp
 102 \fI\%memcached_result_free()\fP will deallocate any memory attached to the
 103 structure. If the structure was also allocated, it will deallocate it.
 104 .sp
 105 \fI\%memcached_result_key_value()\fP returns the key value associated with the
 106 current result object.
 107 .sp
 108 \fI\%memcached_result_key_length()\fP returns the key length associated with
 109 the current result object.
 110 .sp
 111 \fI\%memcached_result_value()\fP returns the result value associated with the
 112 current result object.
 113 .sp
 114 \fI\%memcached_result_length()\fP returns the result length associated with
 115 the current result object.
 116 .sp
 117 \fI\%memcached_result_flags()\fP returns the flags associated with the
 118 current result object.
 119 .sp
 120 \fI\%memcached_result_cas()\fP returns the cas associated with the
 121 current result object. This value will only be available if the server
 122 tests it.
 123 .sp
 124 \fI\%memcached_result_set_value()\fP takes a byte array and a size and sets
 125 the result to this value. This function is used for trigger responses.
 126 .sp
 127 \fI\%memcached_result_set_flags()\fP takes a result structure and stores a new
 128 value for the flags field.
 129 .sp
 130 \fI\%memcached_result_set_expiration()\fP takes a result structure and stores
 131 a new value for the expiration field (this is only used by read through
 132 triggers).
 133 .sp
 134 You may wish to avoid using memcached_result_create(3) with a
 135 stack based allocation. The most common issues related to ABI safety involve
 136 heap allocated structures.
 137 .SH RETURN
 138 .sp
 139 Varies, see particular functions. All structures must have
 140 \fI\%memcached_result_free()\fP called on them for cleanup purposes. Failure
 141 to do this will result in leaked memory.
 142 .SH HOME
 143 .sp
 144 To find out more information please check:
 145 \fI\%http://libmemcached.org/\fP
 146 .SH SEE ALSO
 147 .sp
 148 \fImemcached(1)\fP \fIlibmemcached(3)\fP \fImemcached_strerror(3)\fP
 149 .SH AUTHOR
 150 Brian Aker
 151 .SH COPYRIGHT
 152 2011, Brian Aker DataDifferential, http://datadifferential.com/
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