swq_8h-source.html

gdal库的学习文档

<a name="l00100"></a>00100 
<a name="l00101"></a>00101 <span class="comment">/*</span>
<a name="l00102"></a>00102 <span class="comment">** Evaluate an expression for a particular record using an application</span>
<a name="l00103"></a>00103 <span class="comment">** provided field operation evaluator, and abstract record handle. </span>
<a name="l00104"></a>00104 <span class="comment">*/</span>
<a name="l00105"></a>00105 <span class="keywordtype">int</span> swq_expr_evaluate( swq_expr *expr, swq_op_evaluator fn_evaluator,
<a name="l00106"></a>00106                        <span class="keywordtype">void</span> *record_handle );
<a name="l00107"></a>00107 
<a name="l00108"></a>00108 <span class="keywordtype">void</span> swq_expr_free( swq_expr * );
<a name="l00109"></a>00109 
<a name="l00110"></a>00110 <span class="keywordtype">int</span> swq_test_like( <span class="keyword">const</span> <span class="keywordtype">char</span> *input, <span class="keyword">const</span> <span class="keywordtype">char</span> *pattern );
<a name="l00111"></a>00111 
<a name="l00112"></a>00112 
<a name="l00113"></a>00113 <span class="comment">/****************************************************************************/</span>
<a name="l00114"></a>00114 
<a name="l00115"></a>00115 <span class="preprocessor">#define SWQP_ALLOW_UNDEFINED_COL_FUNCS 0x01</span>
<a name="l00116"></a>00116 <span class="preprocessor"></span>
<a name="l00117"></a>00117 <span class="preprocessor">#define SWQM_SUMMARY_RECORD  1</span>
<a name="l00118"></a>00118 <span class="preprocessor"></span><span class="preprocessor">#define SWQM_RECORDSET       2</span>
<a name="l00119"></a>00119 <span class="preprocessor"></span><span class="preprocessor">#define SWQM_DISTINCT_LIST   3</span>
<a name="l00120"></a>00120 <span class="preprocessor"></span>
<a name="l00121"></a>00121 <span class="keyword">typedef</span> <span class="keyword">enum</span> {
<a name="l00122"></a>00122     SWQCF_NONE,
<a name="l00123"></a>00123     SWQCF_AVG,
<a name="l00124"></a>00124     SWQCF_MIN,
<a name="l00125"></a>00125     SWQCF_MAX,
<a name="l00126"></a>00126     SWQCF_COUNT,
<a name="l00127"></a>00127     SWQCF_SUM,
<a name="l00128"></a>00128     SWQCF_CUSTOM
<a name="l00129"></a>00129 } swq_col_func;
<a name="l00130"></a>00130 
<a name="l00131"></a>00131 <span class="keyword">typedef</span> <span class="keyword">struct </span>{
<a name="l00132"></a>00132     swq_col_func col_func;
<a name="l00133"></a>00133     <span class="keywordtype">char</span>         *col_func_name;
<a name="l00134"></a>00134     <span class="keywordtype">char</span>         *field_name;
<a name="l00135"></a>00135     <span class="keywordtype">int</span>          table_index;
<a name="l00136"></a>00136     <span class="keywordtype">int</span>          field_index;
<a name="l00137"></a>00137     swq_field_type field_type;
<a name="l00138"></a>00138     <span class="keywordtype">int</span>          distinct_flag;
<a name="l00139"></a>00139 } swq_col_def;
<a name="l00140"></a>00140 
<a name="l00141"></a>00141 <span class="keyword">typedef</span> <span class="keyword">struct </span>{
<a name="l00142"></a>00142     <span class="keywordtype">int</span>         count;
<a name="l00143"></a>00143     
<a name="l00144"></a>00144     <span class="keywordtype">char</span>        **distinct_list;
<a name="l00145"></a>00145     <span class="keywordtype">double</span>      sum;
<a name="l00146"></a>00146     <span class="keywordtype">double</span>      min;
<a name="l00147"></a>00147     <span class="keywordtype">double</span>      max;
<a name="l00148"></a>00148 } swq_summary;
<a name="l00149"></a>00149 
<a name="l00150"></a>00150 <span class="keyword">typedef</span> <span class="keyword">struct </span>{
<a name="l00151"></a>00151     <span class="keywordtype">char</span> *field_name;
<a name="l00152"></a>00152     <span class="keywordtype">int</span>   table_index;
<a name="l00153"></a>00153     <span class="keywordtype">int</span>   field_index;
<a name="l00154"></a>00154     <span class="keywordtype">int</span>   ascending_flag;
<a name="l00155"></a>00155 } swq_order_def;
<a name="l00156"></a>00156 
<a name="l00157"></a>00157 <span class="keyword">typedef</span> <span class="keyword">struct </span>{
<a name="l00158"></a>00158     <span class="keywordtype">int</span>        secondary_table;
<a name="l00159"></a>00159 
<a name="l00160"></a>00160     <span class="keywordtype">char</span>      *primary_field_name;
<a name="l00161"></a>00161     <span class="keywordtype">int</span>        primary_field;
<a name="l00162"></a>00162 
<a name="l00163"></a>00163     swq_op     op;
<a name="l00164"></a>00164 
<a name="l00165"></a>00165     <span class="keywordtype">char</span>      *secondary_field_name;
<a name="l00166"></a>00166     <span class="keywordtype">int</span>        secondary_field;
<a name="l00167"></a>00167 } swq_join_def;
<a name="l00168"></a>00168 
<a name="l00169"></a>00169 <span class="keyword">typedef</span> <span class="keyword">struct </span>{
<a name="l00170"></a>00170     <span class="keywordtype">int</span>         query_mode;
<a name="l00171"></a>00171 
<a name="l00172"></a>00172     <span class="keywordtype">char</span>        *raw_select;
<a name="l00173"></a>00173 
<a name="l00174"></a>00174     <span class="keywordtype">int</span>         result_columns;
<a name="l00175"></a>00175     swq_col_def *column_defs;
<a name="l00176"></a>00176     swq_summary *column_summary;
<a name="l00177"></a>00177 
<a name="l00178"></a>00178     <span class="keywordtype">int</span>         table_count;
<a name="l00179"></a>00179     swq_table_def *table_defs;
<a name="l00180"></a>00180 
<a name="l00181"></a>00181     <span class="keywordtype">int</span>         join_count;
<a name="l00182"></a>00182     swq_join_def *join_defs;
<a name="l00183"></a>00183 
<a name="l00184"></a>00184     <span class="keywordtype">char</span>        *whole_where_clause;
<a name="l00185"></a>00185     swq_expr    *where_expr;
<a name="l00186"></a>00186 
<a name="l00187"></a>00187     <span class="keywordtype">int</span>         order_specs;
<a name="l00188"></a>00188     swq_order_def *order_defs;    
<a name="l00189"></a>00189 } swq_select;
<a name="l00190"></a>00190 
<a name="l00191"></a>00191 <span class="keyword">const</span> <span class="keywordtype">char</span> *swq_select_preparse( <span class="keyword">const</span> <span class="keywordtype">char</span> *select_statement, 
<a name="l00192"></a>00192                                  swq_select **select_info );
<a name="l00193"></a>00193 <span class="keyword">const</span> <span class="keywordtype">char</span> *swq_select_expand_wildcard( swq_select *select_info,
<a name="l00194"></a>00194                                         swq_field_list *field_list );
<a name="l00195"></a>00195 <span class="keyword">const</span> <span class="keywordtype">char</span> *swq_select_parse( swq_select *select_info,
<a name="l00196"></a>00196                               swq_field_list *field_list,
<a name="l00197"></a>00197                               <span class="keywordtype">int</span> parse_flags );
<a name="l00198"></a>00198 <span class="keywordtype">void</span> swq_select_free( swq_select *select_info );
<a name="l00199"></a>00199 
<a name="l00200"></a>00200 <span class="keyword">const</span> <span class="keywordtype">char</span> *swq_reform_command( swq_select *select_info );
<a name="l00201"></a>00201 <span class="keywordtype">void</span> swq_free( <span class="keywordtype">void</span> * );
<a name="l00202"></a>00202 <span class="keywordtype">void</span> *swq_malloc( <span class="keywordtype">int</span> );
<a name="l00203"></a>00203 
<a name="l00204"></a>00204 <span class="keyword">const</span> <span class="keywordtype">char</span> *swq_select_finish_summarize( swq_select *select_info );
<a name="l00205"></a>00205 <span class="keyword">const</span> <span class="keywordtype">char</span> *swq_select_summarize( swq_select *select_info, 
<a name="l00206"></a>00206                                   <span class="keywordtype">int</span> dest_column, 
<a name="l00207"></a>00207                                   <span class="keyword">const</span> <span class="keywordtype">char</span> *value );
<a name="l00208"></a>00208 
<a name="l00209"></a>00209 
<a name="l00210"></a>00210 <span class="preprocessor">#endif </span><span class="comment">/* def _SWQ_H_INCLUDED_ */</span>
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