conversioncmds.h File Reference
Include dependency graph for conversioncmds.h:
This graph shows which files directly or indirectly include this file:
Go to the source code of this file.
Functions | |
| ObjectAddress | CreateConversionCommand (CreateConversionStmt *stmt) |
Function Documentation
◆ CreateConversionCommand()
| ObjectAddress CreateConversionCommand | ( | CreateConversionStmt * | stmt | ) |
Definition at line 32 of file conversioncmds.c.
33{
34 Oid namespaceId;
35 char *conversion_name;
36 AclResult aclresult;
37 int from_encoding;
38 int to_encoding;
39 Oid funcoid;
44 char result[1];
45 Datum funcresult;
46
47 /* Convert list of names to a name and namespace */
49 &conversion_name);
50
51 /* Check we have creation rights in target namespace */
55 get_namespace_name(namespaceId));
56
57 /* Check the encoding names */
58 from_encoding = pg_char_to_encoding(from_encoding_name);
59 if (from_encoding < 0)
61 (errcode(ERRCODE_UNDEFINED_OBJECT),
63 from_encoding_name)));
64
65 to_encoding = pg_char_to_encoding(to_encoding_name);
66 if (to_encoding < 0)
68 (errcode(ERRCODE_UNDEFINED_OBJECT),
70 to_encoding_name)));
71
72 /*
73 * We consider conversions to or from SQL_ASCII to be meaningless. (If
74 * you wish to change this, note that pg_do_encoding_conversion() and its
75 * sister functions have hard-wired fast paths for any conversion in which
76 * the source or target encoding is SQL_ASCII, so that an encoding
77 * conversion function declared for such a case will never be used.)
78 */
81 (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
83
84 /*
85 * Check the existence of the conversion function. Function name could be
86 * a qualified name.
87 */
89 funcargs, false);
90
91 /* Check it returns int4, else it's probably the wrong function */
94 (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
97
98 /* Check we have EXECUTE rights for the function */
102 NameListToString(func_name));
103
104 /*
105 * Check that the conversion function is suitable for the requested source
106 * and target encodings. We do that by calling the function with an empty
107 * string; the conversion function should throw an error if it can't
108 * perform the requested conversion.
109 */
110 funcresult = OidFunctionCall6(funcoid,
111 Int32GetDatum(from_encoding),
112 Int32GetDatum(to_encoding),
114 CStringGetDatum(result),
115 Int32GetDatum(0),
117
118 /*
119 * The function should return 0 for empty input. Might as well check that,
120 * too.
121 */
124 (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
126 NameListToString(func_name))));
127
128 /*
129 * All seem ok, go ahead (possible failure would be a duplicate conversion
130 * name)
131 */
133 from_encoding, to_encoding, funcoid, stmt->def);
134}
void aclcheck_error(AclResult aclerr, ObjectType objtype, const char *objectname)
Definition: aclchk.c:2639
AclResult object_aclcheck(Oid classid, Oid objectid, Oid roleid, AclMode mode)
Definition: aclchk.c:3821
#define OidFunctionCall6(functionId, arg1, arg2, arg3, arg4, arg5, arg6)
Definition: fmgr.h:730
Oid QualifiedNameGetCreationNamespace(const List *names, char **objname_p)
Definition: namespace.c:3487
Oid LookupFuncName(List *funcname, int nargs, const Oid *argtypes, bool missing_ok)
Definition: parse_func.c:2144
ObjectAddress ConversionCreate(const char *conname, Oid connamespace, Oid conowner, int32 conforencoding, int32 contoencoding, Oid conproc, bool def)
Definition: pg_conversion.c:38
Definition: pg_list.h:54
References ACL_CREATE, ACL_EXECUTE, aclcheck_error(), ACLCHECK_OK, BoolGetDatum(), ConversionCreate(), CStringGetDatum(), DatumGetInt32(), ereport, errcode(), errmsg(), ERROR, get_func_rettype(), get_namespace_name(), GetUserId(), Int32GetDatum(), LookupFuncName(), NameListToString(), object_aclcheck(), OBJECT_FUNCTION, OBJECT_SCHEMA, OidFunctionCall6, pg_char_to_encoding, PG_SQL_ASCII, QualifiedNameGetCreationNamespace(), and stmt.
Referenced by ProcessUtilitySlow().
