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Add DECLARE STATEMENT support to ECPG.

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DECLARE STATEMENT is a statement that lets users declare an identifier
pointing at a connection.  This identifier will be used in other embedded
dynamic SQL statement such as PREPARE, EXECUTE, DECLARE CURSOR and so on.
When connecting to a non-default connection, the AT clause can be used in
a DECLARE STATEMENT once and is no longer needed in every dynamic SQL
statement.  This makes ECPG applications easier and more efficient.  Moreover,
writing code without designating connection explicitly improves portability.

Authors: Ideriha-san ("Ideriha, Takeshi" <ideriha.takeshi@jp.fujitsu.com>)
         Kuroda-san ("Kuroda, Hayato" <kuroda.hayato@jp.fujitsu.com>)

Discussion: https://postgr.es/m4E72940DA2BF16479384A86D54D0988A565669DF@G01JPEXMBKW04
This commit is contained in:
Michael Meskes
2019-02-16 10:55:17 +01:00
parent 02a6a54ecd
commit bd7c95f0c1
45 changed files with 2334 additions and 173 deletions
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21
src/interfaces/ecpg/ecpglib/ecpglib_extern.h
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@ -78,6 +78,15 @@ struct statement
PGresult *results;
};
/* structure to store declared statements */
struct declared_statement
{
char *name; /* declared name */
char *connection_name;
char *cursor_name;
struct declared_statement *next;
};
/* structure to store prepared statements for a connection */
struct prepared_statement
{
@ -87,6 +96,12 @@ struct prepared_statement
struct prepared_statement *next;
};
struct cursor_statement
{
char *name; /*cursor name*/
struct cursor_statement *next;
};
/* structure to store connections */
struct connection
{
@ -95,6 +110,7 @@ struct connection
bool autocommit;
struct ECPGtype_information_cache *cache_head;
struct prepared_statement *prep_stmts;
struct cursor_statement *cursor_stmts;
struct connection *next;
};
@ -177,6 +193,11 @@ struct descriptor *ecpg_find_desc(int line, const char *name);
struct prepared_statement *ecpg_find_prepared_statement(const char *,
struct connection *, struct prepared_statement **);
void ecpg_update_declare_statement(const char *, const char *, const int);
char *ecpg_get_con_name_by_declared_name(const char *);
const char *ecpg_get_con_name_by_cursor_name(const char *);
void ecpg_release_declared_statement(const char *);
bool ecpg_store_result(const PGresult *results, int act_field,
const struct statement *stmt, struct variable *var);
bool ecpg_store_input(const int, const bool, const struct variable *, char **, bool);