Database Independent Abstraction Layer for C: libdbi Programmer's Guide
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# 4.2. Error numbers

dbi_conn_error returns DBI_ERROR_NONE (internally 0) if the last operation was successful, and a nonzero value if not. Client library errors use positive error numbers, whereas libdbi errors use negative error numbers as listed in the following table:

Table 4-1. libdbi error numbers

value | description
--- | ---
DBI_ERROR_USER | This indicates an error status set by the application itself, see dbi_conn_set_error
DBI_ERROR_BADOBJECT | invalid connection or result structure
DBI_ERROR_BADTYPE | the accessor function does not match the actual column type
DBI_ERROR_BADIDX | out-of-range index
DBI_ERROR_BADNAME | incorrect column or option name
DBI_ERROR_UNSUPPORTED | feature not supported by driver
DBI_ERROR_NOCONN | no valid connection
DBI_ERROR_NOMEM | out of memory
DBI_ERROR_BADPTR | invalid pointer
DBI_ERROR_NONE | no error occurred
DBI_ERROR_CLIENT | client library error

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