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libdbi-devel-0.8.3-3mdv2010.0.i586.rpm

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><DIV
CLASS="SECTION"
><H1
CLASS="SECTION"
><A
NAME="DRIVERFUNCS-PUBLICDBQUERY"
>3.3. Public Database Query Functions</A
></H1
><DIV
CLASS="SECTION"
><H2
CLASS="SECTION"
><A
NAME="DBD-GET-ENCODING"
>3.3.1. dbd_get_encoding</A
></H2
><DIV
CLASS="FUNCSYNOPSIS"
><P
></P
><A
NAME="AEN303"
></A
><P
><CODE
><CODE
CLASS="FUNCDEF"
>const char *<B
CLASS="FSFUNC"
>dbd_get_encoding</B
></CODE
>(dbi_conn_t *<VAR
CLASS="PDPARAM"
>conn</VAR
>);</CODE
></P
><P
></P
></DIV
><P
>Returns the character encoding used by the current connection.</P
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
>Arguments</DT
><DD
><P
><TT
CLASS="LITERAL"
>conn</TT
>: The target connection.</P
></DD
><DT
>Returns</DT
><DD
><P
>A zero-terminated string containing the IANA name of the character encoding.</P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="SECTION"
><H2
CLASS="SECTION"
><A
NAME="DBD-ENCODING-TO-IANA"
>3.3.2. dbd_encoding_to_iana</A
></H2
><DIV
CLASS="FUNCSYNOPSIS"
><P
></P
><A
NAME="AEN322"
></A
><P
><CODE
><CODE
CLASS="FUNCDEF"
>const char *<B
CLASS="FSFUNC"
>dbd_encoding_to_iana</B
></CODE
>(const char *<VAR
CLASS="PDPARAM"
>db_encoding</VAR
>);</CODE
></P
><P
></P
></DIV
><P
>Converts the database-engine-specific name of a character encoding to the corresponging IANA name.</P
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
>Arguments</DT
><DD
><P
><TT
CLASS="LITERAL"
>db_encoding</TT
>: A pointer to a string containing the character encoding name.</P
></DD
><DT
>Returns</DT
><DD
><P
>A zero-terminated string containing the IANA name of the character encoding. If there is no equivalent IANA name, the original string will be returned.</P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="SECTION"
><H2
CLASS="SECTION"
><A
NAME="DBD-ENCODING-FROM-IANA"
>3.3.3. dbd_encoding_from_iana</A
></H2
><DIV
CLASS="FUNCSYNOPSIS"
><P
></P
><A
NAME="AEN341"
></A
><P
><CODE
><CODE
CLASS="FUNCDEF"
>const char *<B
CLASS="FSFUNC"
>dbd_encoding_from_iana</B
></CODE
>(const char *<VAR
CLASS="PDPARAM"
>iana_encoding</VAR
>);</CODE
></P
><P
></P
></DIV
><P
>Converts the IANA name of a character encoding to the corresponging database-engine-specific name.</P
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
>Arguments</DT
><DD
><P
><TT
CLASS="LITERAL"
>iana_encoding</TT
>: A pointer to a string containing the character encoding name.</P
></DD
><DT
>Returns</DT
><DD
><P
>A zero-terminated string containing the database-engine-specific name of the character encoding. If there is no equivalent IANA name, the original string will be returned.</P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="SECTION"
><H2
CLASS="SECTION"
><A
NAME="DBD-GET-ENGINE-VERSION"
>3.3.4. dbd_get_engine_version</A
></H2
><DIV
CLASS="FUNCSYNOPSIS"
><P
></P
><A
NAME="AEN360"
></A
><P
><CODE
><CODE
CLASS="FUNCDEF"
>char *<B
CLASS="FSFUNC"
>dbd_get_engine_version</B
></CODE
>(dbi_conn_t *<VAR
CLASS="PDPARAM"
>conn</VAR
>, char *<VAR
CLASS="PDPARAM"
>versionstring</VAR
>);</CODE
></P
><P
></P
></DIV
><P
>Returns the version string of the database engine that serves the current connection.</P
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
>Arguments</DT
><DD
><P
><TT
CLASS="LITERAL"
>conn</TT
>: The current connection.</P
><P
><TT
CLASS="LITERAL"
>versionstring</TT
>: A pointer to a string that can hold at least VERSIONSTRING_LENGTH bytes, including the trailing NULL byte. The function will write the version string to this buffer.</P
></DD
><DT
>Returns</DT
><DD
><P
><CODE
CLASS="PARAMETER"
>versionstring</CODE
> which now contains a zero-terminated string representing the database engine version. This string contains only digits and periods. Returns an empty string in case of an error.</P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="SECTION"
><H2
CLASS="SECTION"
><A
NAME="DBD-LIST-DBS"
>3.3.5. dbd_list_dbs</A
></H2
><DIV
CLASS="FUNCSYNOPSIS"
><P
></P
><A
NAME="AEN384"
></A
><P
><CODE
><CODE
CLASS="FUNCDEF"
>dbi_result_t *<B
CLASS="FSFUNC"
>dbd_list_dbs</B
></CODE
>(dbi_conn_t *<VAR
CLASS="PDPARAM"
>conn</VAR
>, const char *<VAR
CLASS="PDPARAM"
>pattern</VAR
>);</CODE
></P
><P
></P
></DIV
><P
>Performs a query that retrieves the list of databases, with the database name as the first column in the result set. If <CODE
CLASS="PARAMETER"
>pattern</CODE
> is non-NULL, only databases whose name match <CODE
CLASS="PARAMETER"
>pattern</CODE
> are listed.</P
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
>Arguments</DT
><DD
><P
><TT
CLASS="LITERAL"
>conn</TT
>: The target connection.</P
><P
><TT
CLASS="LITERAL"
>pattern</TT
>: A SQL regular expression that limits the search, or NULL to list all tables.</P
></DD
><DT
>Returns</DT
><DD
><P
>A DBI result object, or NULL if an error occurs.</P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="SECTION"
><H2
CLASS="SECTION"
><A
NAME="DBD-LIST-TABLES"
>3.3.6. dbd_list_tables</A
></H2
><DIV
CLASS="FUNCSYNOPSIS"
><P
></P
><A
NAME="AEN409"
></A
><P
><CODE
><CODE
CLASS="FUNCDEF"
>dbi_result_t *<B
CLASS="FSFUNC"
>dbd_list_tables</B
></CODE
>(dbi_conn_t *<VAR
CLASS="PDPARAM"
>conn</VAR
>, const char *<VAR
CLASS="PDPARAM"
>db</VAR
>, const char *<VAR
CLASS="PDPARAM"
>pattern</VAR
>);</CODE
></P
><P
></P
></DIV
><P
>Performs a query that retrieves the list of tables in the specified database, with the table name as the first column in the result set. If <CODE
CLASS="PARAMETER"
>pattern</CODE
> is non-NULL, lists only the tables that match <CODE
CLASS="PARAMETER"
>pattern</CODE
>.</P
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
>Arguments</DT
><DD
><P
><TT
CLASS="LITERAL"
>conn</TT
>: The target connection.</P
><P
><TT
CLASS="LITERAL"
>db</TT
>: The name of the database where tables should be looked for.</P
><P
><TT
CLASS="LITERAL"
>pattern</TT
>: A SQL regular expression that limits the search, or NULL to list all tables.</P
></DD
><DT
>Returns</DT
><DD
><P
>A DBI result object, or NULL if an error occurs.</P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="SECTION"
><H2
CLASS="SECTION"
><A
NAME="DBD-QUOTE-STRING"
>3.3.7. dbd_quote_string</A
></H2
><DIV
CLASS="FUNCSYNOPSIS"
><P
></P
><A
NAME="AEN438"
></A
><P
><CODE
><CODE
CLASS="FUNCDEF"
>size_t <B
CLASS="FSFUNC"
>dbd_quote_string</B
></CODE
>(dbi_driver_t *<VAR
CLASS="PDPARAM"
>driver</VAR
>, const char *<VAR
CLASS="PDPARAM"
>orig</VAR
>, char *<VAR
CLASS="PDPARAM"
>dest</VAR
>);</CODE
></P
><P
></P
></DIV
><P
>Given a string, wrap quotes around that string and escape any characters that the database server needs escaped.</P
><DIV
CLASS="NOTE"
><BLOCKQUOTE
CLASS="NOTE"
><P
><B
>Note: </B
>The use of this function in user programs is deprecated, but drivers must still implement it at the moment. If the quoting and escaping does not depend on the connection parameters, it is perfectly legal to let your implementation of <A
HREF="driverfuncs-publicdbquery.html#DBD-CONN-QUOTE-STRING"
>dbd_conn_quote_string</A
> call this function (it is not possible to do it the other way). libdbi makes sure that both <CODE
CLASS="PARAMETER"
>orig</CODE
> and <CODE
CLASS="PARAMETER"
>dest</CODE
> are non-NULL before calling this function.</P
></BLOCKQUOTE
></DIV
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
>Arguments</DT
><DD
><P
><TT
CLASS="LITERAL"
>driver</TT
>: A pointer to the driver itself, which may be useful in weird cases.</P
><P
><TT
CLASS="LITERAL"
>orig</TT
>: The string to quote and escape.</P
><P
><TT
CLASS="LITERAL"
>dest</TT
>: The destination for the new string, which is already allocated as (strlen(orig)*2)+4+1. In the worst case, each character will need to be escaped, with two quote characters at both the beginning and end of the string, plus one for the terminating NULL.</P
></DD
><DT
>Returns</DT
><DD
><P
>The length of the new string.</P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="SECTION"
><H2
CLASS="SECTION"
><A
NAME="DBD-CONN-QUOTE-STRING"
>3.3.8. dbd_conn_quote_string</A
></H2
><DIV
CLASS="FUNCSYNOPSIS"
><P
></P
><A
NAME="AEN470"
></A
><P
><CODE
><CODE
CLASS="FUNCDEF"
>size_t <B
CLASS="FSFUNC"
>dbd_conn_quote_string</B
></CODE
>(dbi_conn_t *<VAR
CLASS="PDPARAM"
>conn</VAR
>, const char *<VAR
CLASS="PDPARAM"
>orig</VAR
>, char *<VAR
CLASS="PDPARAM"
>dest</VAR
>);</CODE
></P
><P
></P
></DIV
><P
>Given a string, wrap quotes around that string and escape any characters that the database server needs escaped.</P
><DIV
CLASS="NOTE"
><BLOCKQUOTE
CLASS="NOTE"
><P
><B
>Note: </B
>The use of this function in user programs is preferred over <A
HREF="driverfuncs-publicdbquery.html#DBD-QUOTE-STRING"
>dbd_quote_string</A
>. If the quoting and escaping does not depend on the connection parameters, it is perfectly legal to let your implementation of this function call <A
HREF="driverfuncs-publicdbquery.html#DBD-QUOTE-STRING"
>dbd_quote_string</A
>. libdbi makes sure that both <CODE
CLASS="PARAMETER"
>orig</CODE
> and <CODE
CLASS="PARAMETER"
>dest</CODE
> are non-NULL before calling this function.</P
></BLOCKQUOTE
></DIV
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
>Arguments</DT
><DD
><P
><TT
CLASS="LITERAL"
>conn</TT
>: A pointer to the current connection.</P
><P
><TT
CLASS="LITERAL"
>orig</TT
>: The string to quote and escape.</P
><P
><TT
CLASS="LITERAL"
>dest</TT
>: The destination for the new string, which is already allocated as (strlen(orig)*2)+4+1. In the worst case, each character will need to be escaped, with two quote characters at both the beginning and end of the string, plus one for the terminating NULL.</P
></DD
><DT
>Returns</DT
><DD
><P
>The length of the new string.</P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="SECTION"
><H2
CLASS="SECTION"
><A
NAME="DBD-QUOTE-BINARY"
>3.3.9. dbd_quote_binary</A
></H2
><DIV
CLASS="FUNCSYNOPSIS"
><P
></P
><A
NAME="AEN503"
></A
><P
><CODE
><CODE
CLASS="FUNCDEF"
>size_t <B
CLASS="FSFUNC"
>dbd_quote_binary</B
></CODE
>(dbi_conn_t *<VAR
CLASS="PDPARAM"
>conn</VAR
>, const char *<VAR
CLASS="PDPARAM"
>orig</VAR
>, size_t <VAR
CLASS="PDPARAM"
>from_length</VAR
>, char **<VAR
CLASS="PDPARAM"
>dest</VAR
>);</CODE
></P
><P
></P
></DIV
><P
>Given a binary string (which may contain NULL bytes and other non-printable characters), wrap quotes around that string and escape any characters that the database server needs escaped. If the function returns an error, *<CODE
CLASS="PARAMETER"
>dest</CODE
> is not a valid pointer to a string.</P
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
>Arguments</DT
><DD
><P
><TT
CLASS="LITERAL"
>conn</TT
>: A pointer to the current connection.</P
><P
><TT
CLASS="LITERAL"
>orig</TT
>: The string to quote and escape.</P
><P
><TT
CLASS="LITERAL"
>from_length</TT
>: The length, in bytes, of the binary string.</P
><P
><TT
CLASS="LITERAL"
>dest</TT
>: A pointer to the destination of the new zero-terminated string. The function allocates the required memory as required and updates the pointer that <CODE
CLASS="PARAMETER"
>dest</CODE
> points to accordingly.</P
></DD
><DT
>Returns</DT
><DD
><P
>The length of the new string, or DBI_LENGTH_ERROR in case of an error.</P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="SECTION"
><H2
CLASS="SECTION"
><A
NAME="DBD-QUERY"
>3.3.10. dbd_query</A
></H2
><DIV
CLASS="FUNCSYNOPSIS"
><P
></P
><A
NAME="AEN536"
></A
><P
><CODE
><CODE
CLASS="FUNCDEF"
>dbi_result_t *<B
CLASS="FSFUNC"
>dbd_query</B
></CODE
>(dbi_conn_t *<VAR
CLASS="PDPARAM"
>conn</VAR
>, const char *<VAR
CLASS="PDPARAM"
>statement</VAR
>);</CODE
></P
><P
></P
></DIV
><P
>Performs a query and keeps track of meta-information about the query. Also see the <A
HREF="helperfuncs.html#INTERNAL-DBD-RESULT-CREATE"
>_dbd_result_create</A
> helper function.</P
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
>Arguments</DT
><DD
><P
><TT
CLASS="LITERAL"
>conn</TT
>: The target connection.</P
><P
><TT
CLASS="LITERAL"
>statement</TT
>: The zero-terminated query string to execute.</P
></DD
><DT
>Returns</DT
><DD
><P
>A DBI result object, or NULL on error.</P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="SECTION"
><H2
CLASS="SECTION"
><A
NAME="DBD-QUERY-NULL"
>3.3.11. dbd_query_null</A
></H2
><DIV
CLASS="FUNCSYNOPSIS"
><P
></P
><A
NAME="AEN560"
></A
><P
><CODE
><CODE
CLASS="FUNCDEF"
>dbi_result_t *<B
CLASS="FSFUNC"
>dbd_query_null</B
></CODE
>(dbi_conn_t *<VAR
CLASS="PDPARAM"
>conn</VAR
>, const unsigned char *<VAR
CLASS="PDPARAM"
>statement</VAR
>, size_t <VAR
CLASS="PDPARAM"
>st_length</VAR
>);</CODE
></P
><P
></P
></DIV
><P
>Performs a query using a binary query string and keeps track of meta-information about the query. Also see the <A
HREF="helperfuncs.html#INTERNAL-DBD-RESULT-CREATE"
>_dbd_result_create</A
> helper function.</P
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
>Arguments</DT
><DD
><P
><TT
CLASS="LITERAL"
>conn</TT
>: The target connection.</P
><P
><TT
CLASS="LITERAL"
>statement</TT
>: The query string to execute, which may contain NULL bytes and other non-printable characters.</P
><P
><TT
CLASS="LITERAL"
>st_length</TT
>: The length of the binary query string.</P
></DD
><DT
>Returns</DT
><DD
><P
>A DBI result object, or NULL on error.</P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="SECTION"
><H2
CLASS="SECTION"
><A
NAME="DBD-SELECT-DB"
>3.3.12. dbd_select_db</A
></H2
><DIV
CLASS="FUNCSYNOPSIS"
><P
></P
><A
NAME="AEN588"
></A
><P
><CODE
><CODE
CLASS="FUNCDEF"
>const char *<B
CLASS="FSFUNC"
>dbd_select_db</B
></CODE
>(dbi_conn_t *<VAR
CLASS="PDPARAM"
>conn</VAR
>, const char* <VAR
CLASS="PDPARAM"
>db</VAR
>);</CODE
></P
><P
></P
></DIV
><P
>Selects a new database on the server.</P
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
>Arguments</DT
><DD
><P
><TT
CLASS="LITERAL"
>conn</TT
>: The target connection.</P
><P
><TT
CLASS="LITERAL"
>db</TT
>: The name of the database to switch to.</P
></DD
><DT
>Returns</DT
><DD
><P
>The database name on success, NULL on error, or an empty string if the operation is not supported by the database server.</P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="SECTION"
><H2
CLASS="SECTION"
><A
NAME="DBD-GET-SEQ-LAST"
>3.3.13. dbd_get_seq_last</A
></H2
><DIV
CLASS="FUNCSYNOPSIS"
><P
></P
><A
NAME="AEN611"
></A
><P
><CODE
><CODE
CLASS="FUNCDEF"
>unsigned long long <B
CLASS="FSFUNC"
>dbd_get_seq_last</B
></CODE
>(dbi_conn_t *<VAR
CLASS="PDPARAM"
>conn</VAR
>, const char *<VAR
CLASS="PDPARAM"
>sequence</VAR
>);</CODE
></P
><P
></P
></DIV
><P
>Returns the row ID generated by the last <B
CLASS="COMMAND"
>INSERT</B
> command.</P
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
>Arguments</DT
><DD
><P
><TT
CLASS="LITERAL"
>conn</TT
>: The target connection.</P
><P
><TT
CLASS="LITERAL"
>sequence</TT
>: The name of the sequence if the database engine requires this, or NULL if it is not required.</P
></DD
><DT
>Returns</DT
><DD
><P
>The row ID if successful, otherwise 0.</P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="SECTION"
><H2
CLASS="SECTION"
><A
NAME="DBD-GET-SEQ-NEXT"
>3.3.14. dbd_get_seq_next</A
></H2
><DIV
CLASS="FUNCSYNOPSIS"
><P
></P
><A
NAME="AEN635"
></A
><P
><CODE
><CODE
CLASS="FUNCDEF"
>unsigned long long <B
CLASS="FSFUNC"
>dbd_get_seq_next</B
></CODE
>(dbi_conn_t *<VAR
CLASS="PDPARAM"
>conn</VAR
>, const char *<VAR
CLASS="PDPARAM"
>sequence</VAR
>);</CODE
></P
><P
></P
></DIV
><P
>Increments the sequence counter by the preset increment, and returns the resulting row ID.</P
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
>Arguments</DT
><DD
><P
><TT
CLASS="LITERAL"
>conn</TT
>: The target connection.</P
><P
><TT
CLASS="LITERAL"
>sequence</TT
>: The name of the sequence if the database engine requires this, or NULL if it is not required.</P
></DD
><DT
>Returns</DT
><DD
><P
>The row ID if successful, otherwise 0. Also return 0 if the database engine does not implement this feature.</P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="SECTION"
><H2
CLASS="SECTION"
><A
NAME="DBD-PING"
>3.3.15. dbd_ping</A
></H2
><DIV
CLASS="FUNCSYNOPSIS"
><P
></P
><A
NAME="AEN658"
></A
><P
><CODE
><CODE
CLASS="FUNCDEF"
>int <B
CLASS="FSFUNC"
>dbd_ping</B
></CODE
>(dbi_conn_t *<VAR
CLASS="PDPARAM"
>conn</VAR
>);</CODE
></P
><P
></P
></DIV
><P
>Checks whether the database connection is still alive.</P
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
>Arguments</DT
><DD
><P
><TT
CLASS="LITERAL"
>conn</TT
>: The target connection.</P
></DD
><DT
>Returns</DT
><DD
><P
>1 if the connection is alive, otherwise 0. This function may be implemented such that it automatically attempts to reconnect if the connection went down. If the reconnect is successful, the function should also return 1.</P
></DD
></DL
></DIV
></DIV
></DIV
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