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Overview
Comment:added db_generic_query_view() to simplify /tabview and /my implementations
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SHA1: 74ba41a5104a814128597cf8facbbb250a0c360b
User & Date: stephan 2008-02-03 21:50:20.000
Context
2008-02-03
21:56
refactored some /tagview code into more generic bits. Added string_xform.c. check-in: 9c01af2d22 user: stephan tags: trunk
21:50
added db_generic_query_view() to simplify /tabview and /my implementations check-in: 74ba41a510 user: stephan tags: trunk
18:00
Fixed a memory leak in tagview_page_list_tags(). Minor other refactorings. check-in: 2cb3290e67 user: stephan tags: trunk
Changes
Unified Diff Ignore Whitespace Patch
Changes to src/db.c.
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    }else{
      print_setting(azName[i]);
    }
  }else{
    usage("?PROPERTY? ?VALUE?");
  }
}



































































































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    }else{
      print_setting(azName[i]);
    }
  }else{
    usage("?PROPERTY? ?VALUE?");
  }
}



/**
* db_generic_query_view():
*
* A very primitive helper to run an SQL query and table-ize the
* results.
*
* The sql parameter should be a single, complete SQL statement.
*
* The coln parameter is optional (it may be 0). If it is 0 then the
* column names used in the output will be taken directly from the
* SQL. If it is not null then it must have as many entries as the SQL
* result has columns. Each entry is a column name for the SQL result
* column of the same index. Any given entry may be 0, in which case
* the column name from the SQL is used.
*
* The xform argument is an array of transformation functions (type
* string_unary_xform_f). The array, or any single entry, may be 0, but
* if the array is non-0 then it must have at least as many entries as
* colnames does. Each index corresponds directly to an entry in
* colnames and the SQL results.  Any given entry may be 0. If it has
* fewer, undefined behaviour results.  If a column has an entry in
* xform, then the xform function will be called to transform the
* column data before rendering it. This function takes care of freeing
* the strings created by the xform functions.
*
* Example:
*
*  char const * const colnames[] = {
*   "Tag ID", "Tag Name", "Something Else", "UUID"
*  };
*  string_unary_xform_f xf[] = {
*    strxform_link_to_tagid,
*    strxform_link_to_tagname,
*    0,
*    strxform_link_to_uuid
*  };
*  db_generic_query_view( "select a,b,c,d from foo", colnames, xf );
*
*/
void db_generic_query_view(
  char const * sql,
  char const * const * coln,
  string_unary_xform_f * xform )
{
  
  Stmt st;
  int i = 0;
  int rc = db_prepare( &st, sql );
  /**
    Achtung: makeheaders apparently can't pull the function
    name from this:
   if( SQLITE_OK != db_prepare( &st, sql ) )
  */
  if( SQLITE_OK != rc )
  {
    @ db_generic_query_view(): Error processing SQL: [%s(sql)]
    return;
  }
  int colc = db_column_count(&st);
  @ <table cellpadding='4px' border='1'><tbody>
  @ <tr>
  for( i = 0; i < colc; ++i ) {
    if( coln )
    {
      @ <th>%s(coln[i] ? coln[i] : db_column_name(&st,i))</th>
    }
    else
    {
      @ <td>%s(db_column_name(&st,i))</td>
    }
  }
  @ </tr>

  while( SQLITE_ROW == db_step(&st) ){
    @ <tr>
      for( i = 0; i < colc; ++i ) {
        char * xf = 0;
        char const * xcf = 0;
        xcf = (xform && xform[i])
          ? (xf=(xform[i])(db_column_text(&st,i)))
          : db_column_text(&st,i);
        @ <td>%s(xcf)</td>
        if( xf ) free( xf );
      }
    @ </tr>
  }
  db_finalize( &st );
  @ </tbody></table>
}