dbColumnInfo(res, ...)DBIResult .res. Methods
MUST include name, field.type (the SQL type),
and data.type (the R data type) columns, and MAY contain other
database specific information like scale and precision or whether the
field can store NULLs.dbClearResult;
dbFetch,
dbFetch,DBIResult-method,
fetch; dbGetRowCount,
dbGetRowCount,DBIResult-method;
dbGetRowsAffected,
dbGetRowsAffected,DBIResult-method;
dbGetStatement,
dbGetStatement,DBIResult-method;
dbHasCompleted,
dbHasCompleted,DBIResult-method