odbcConnect              package:RODBC              R Documentation

_O_D_B_C _O_p_e_n _C_o_n_n_e_c_t_i_o_n_s

_D_e_s_c_r_i_p_t_i_o_n:

     Open connections to ODBC databases.

_U_s_a_g_e:

     odbcConnect(dsn, uid = "", pwd = "", case = "nochange",
                 believeNRows = TRUE)

     odbcDriverConnect(connection = "", case = "nochange",
                       believeNRows = TRUE)

     odbcReConnect(channel, case, believeNRows)

_A_r_g_u_m_e_n_t_s:

     dsn: character string. A registered data source name.

uid, pwd: UID and password for authentication (if required).

connection: character string. See your ODBC documentation for the
          format.

    case: Controls case changes for different RDBMS engines.

 channel: RODBC connection object returned by 'odbcConnect'.

believeNRows: logical.  Is the number of rows returned by the ODBC
          connection believable?  Not true for Oracle and Sybase,
          apparently.

_D_e_t_a_i_l_s:

     'odbcConnect' establishes a connection to the dsn, and
     'odbcDriverConnect' allows a more flexible specification via a
     connection string.  'odbcConnect' uses the connection string
      '"DSN=dsn;UID=uid;PWD=pwd"', omitting the last two comments if
     they are empty.  See the examples for other uses of connection
     strings.

     For databases that translate table and column names the case must
     be set as appropriate.  Allowable values are '"nochange"',
     '"toupper"' and '"tolower"' as well as the names of databases
     where the behaviour is known to us (currently '"mysql"' (which
     maps to lower case on Windows but not on Linux), '"postgresql"'
     (lower), '"oracle"' (upper) and '"msaccess"' (nochange)).

     Function 'odbcReConnect' re-connects to a database using the
     settings of an existing (and presumably now closed) channel
     object. Arguments 'case' and 'believeNRows' are taken from the
     object, but can be overridden by supplying those arguments.

_V_a_l_u_e:

     A non-negative integer which is used as handle if no error
     occurred, -1 otherwise. A successful return has class '"RODBC"',
     and attribute '"connection.string"' giving the full ODBC
     connection string.

_A_u_t_h_o_r(_s):

     Michael Lapsley, Brian Ripley

_S_e_e _A_l_s_o:

     'odbcClose', 'sqlQuery', 'odbcGetInfo'

_E_x_a_m_p_l_e_s:

     ## Not run: 
     # MySQL
     channel <- odbcConnect("test", uid="ripley", pwd="secret")
     # PostgreSQL
     channel <- odbcConnect("pg", uid="ripley", pwd="secret", case="postgresql")

     # re-connection
     odbcCloseAll()
     channel <- odbcReConnect(channel) # must re-assign as the data may well change
     ## End(Not run)

