Contents Index Data manipulation: INSERT, UPDATE and DELETE Navigating through dynamic SQL result sets

UltraLite C++ User's Guide
  Understanding UltraLite Development
    Accessing and manipulating data with dynamic SQL

Data retrieval: SELECT


Use the SELECT statement to retrieve information from the database.

To execute a SELECT query using ExecuteQuery:

  1. Create a new prepared statement and result set.

    PreparedStatement * prepStmt;
  2. Assign a prepared statement to your newly created PreparedStatement object.

    ULValue sqltext( "SELECT MyColumn FROM MyTable" );
    prepStmt = conn->PrepareStatement( sqltext );
  3. Execute the statement.

    In the following code, the result of the SELECT query contain a string, which is output to a command prompt.

    #define MAX_NAME_LEN       100
    ULValue mycol;
    ResultSet * rs = stmt->ExecuteQuery();
    rs->BeforeFirst();
    while( rs->Next() ){
       char mycol[ MAX_NAME_LEN ];
       val = rs->Get( 1 );
       val.GetString( mycol, MAX_NAME_LEN );
       printf( "mycol= %s\n", mycol );
    }

Contents Index Data manipulation: INSERT, UPDATE and DELETE Navigating through dynamic SQL result sets