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/******************************************************
file:
vString.c
purpose:
python type define for DM char/varchar/binary/varbinary variables in dmPython
interface:
{}
history:
Date Who RefDoc Memo
2015-6-9 wmm Created
*******************************************************/
#include
"var_pub.h"
#include
"Error.h"
#include
"py_Dameng.h"
#include
"Buffer.h"
//-----------------------------------------------------------------------------
// Declaration of string variable functions.
//-----------------------------------------------------------------------------
static
int
StringVar_Initialize
(
dm_StringVar
*
);
static
int
StringVar_SetValue
(
dm_StringVar
*
,
unsigned
,
PyObject
*
);
static
PyObject
*
StringVar_GetValue
(
dm_StringVar
*
,
unsigned
);
#if
PY_MAJOR_VERSION
<
3
static
int
StringVar_PostDefine
(
dm_StringVar
*
);
#endif
static
udint4
StringVar_GetBufferSize
(
dm_StringVar
*
);
static
int
StringVar_BindObjectValue
(
dm_StringVar
*
,
unsigned
,
dhobj
,
udint4
);
//-----------------------------------------------------------------------------
// Python type declarations
//-----------------------------------------------------------------------------
PyTypeObject
g_StringType
=
{
PyVarObject_HEAD_INIT
(
NULL
,
0
)
"dmPython.STRING"
,
// tp_name
sizeof
(
dm_StringVar
),
// tp_basicsize
0
,
// tp_itemsize
0
,
// tp_dealloc
0
,
// tp_print
0
,
// tp_getattr
0
,
// tp_setattr
0
,
// tp_compare
0
,
// tp_repr
0
,
// tp_as_number
0
,
// tp_as_sequence
0
,
// tp_as_mapping
0
,
// tp_hash
0
,
// tp_call
0
,
// tp_str
0
,
// tp_getattro
0
,
// tp_setattro
0
,
// tp_as_buffer
Py_TPFLAGS_DEFAULT
,
// tp_flags
0
// tp_doc
};
#if
PY_MAJOR_VERSION
<
3
PyTypeObject
g_UnicodeStrType
=
{
PyVarObject_HEAD_INIT
(
NULL
,
0
)
"dmPython.UNICODE_STRING"
,
// tp_name
sizeof
(
dm_StringVar
),
// tp_basicsize
0
,
// tp_itemsize
0
,
// tp_dealloc
0
,
// tp_print
0
,
// tp_getattr
0
,
// tp_setattr
0
,
// tp_compare
0
,
// tp_repr
0
,
// tp_as_number
0
,
// tp_as_sequence
0
,
// tp_as_mapping
0
,
// tp_hash
0
,
// tp_call
0
,
// tp_str
0
,
// tp_getattro
0
,
// tp_setattro
0
,
// tp_as_buffer
Py_TPFLAGS_DEFAULT
,
// tp_flags
0
// tp_doc
};
#endif
PyTypeObject
g_FixedCharType
=
{
PyVarObject_HEAD_INIT
(
NULL
,
0
)
"dmPython.FIXED_STRING"
,
// tp_name
sizeof
(
dm_StringVar
),
// tp_basicsize
0
,
// tp_itemsize
0
,
// tp_dealloc
0
,
// tp_print
0
,
// tp_getattr
0
,
// tp_setattr
0
,
// tp_compare
0
,
// tp_repr
0
,
// tp_as_number
0
,
// tp_as_sequence
0
,
// tp_as_mapping
0
,
// tp_hash
0
,
// tp_call
0
,
// tp_str
0
,
// tp_getattro
0
,
// tp_setattro
0
,
// tp_as_buffer
Py_TPFLAGS_DEFAULT
,
// tp_flags
0
// tp_doc
};
#if
PY_MAJOR_VERSION
<
3
PyTypeObject
g_FixedUnicodeCharType
=
{
PyVarObject_HEAD_INIT
(
NULL
,
0
)
"dmPython.FIXED_UNICODE_STRING"
,
// tp_name
sizeof
(
dm_StringVar
),
// tp_basicsize
0
,
// tp_itemsize
0
,
// tp_dealloc
0
,
// tp_print
0
,
// tp_getattr
0
,
// tp_setattr
0
,
// tp_compare
0
,
// tp_repr
0
,
// tp_as_number
0
,
// tp_as_sequence
0
,
// tp_as_mapping
0
,
// tp_hash
0
,
// tp_call
0
,
// tp_str
0
,
// tp_getattro
0
,
// tp_setattro
0
,
// tp_as_buffer
Py_TPFLAGS_DEFAULT
,
// tp_flags
0
// tp_doc
};
#endif
PyTypeObject
g_BinaryType
=
{
PyVarObject_HEAD_INIT
(
NULL
,
0
)
"dmPython.BINARY"
,
// tp_name
sizeof
(
dm_StringVar
),
// tp_basicsize
0
,
// tp_itemsize
0
,
// tp_dealloc
0
,
// tp_print
0
,
// tp_getattr
0
,
// tp_setattr
0
,
// tp_compare
0
,
// tp_repr
0
,
// tp_as_number
0
,
// tp_as_sequence
0
,
// tp_as_mapping
0
,
// tp_hash
0
,
// tp_call
0
,
// tp_str
0
,
// tp_getattro
0
,
// tp_setattro
0
,
// tp_as_buffer
Py_TPFLAGS_DEFAULT
,
// tp_flags
0
// tp_doc
};
PyTypeObject
g_FixedBinaryType
=
{
PyVarObject_HEAD_INIT
(
NULL
,
0
)
"dmPython.FIXED_BINARY"
,
// tp_name
sizeof
(
dm_StringVar
),
// tp_basicsize
0
,
// tp_itemsize
0
,
// tp_dealloc
0
,
// tp_print
0
,
// tp_getattr
0
,
// tp_setattr
0
,
// tp_compare
0
,
// tp_repr
0
,
// tp_as_number
0
,
// tp_as_sequence
0
,
// tp_as_mapping
0
,
// tp_hash
0
,
// tp_call
0
,
// tp_str
0
,
// tp_getattro
0
,
// tp_setattro
0
,
// tp_as_buffer
Py_TPFLAGS_DEFAULT
,
// tp_flags
0
// tp_doc
};
//-----------------------------------------------------------------------------
// variable type declarations
//-----------------------------------------------------------------------------
dm_VarType
vt_String
=
{
(
InitializeProc
)
NULL
,
(
FinalizeProc
)
NULL
,
(
PreDefineProc
)
NULL
,
(
PreFetchProc
)
NULL
,
(
IsNullProc
)
NULL
,
(
SetValueProc
)
StringVar_SetValue
,
(
GetValueProc
)
StringVar_GetValue
,
(
GetBufferSizeProc
)
StringVar_GetBufferSize
,
(
BindObjectValueProc
)
StringVar_BindObjectValue
,
&
g_StringType
,
// Python type
DSQL_C_NCHAR
,
// c type
MAX_STRING_CHARS
,
// element length (default)
1
,
// is character data
1
,
// is variable length
1
,
// can be copied
1
// can be in array
};
#if
PY_MAJOR_VERSION
<
3
dm_VarType
vt_UnicodeString
=
{
(
InitializeProc
)
NULL
,
(
FinalizeProc
)
NULL
,
(
PreDefineProc
)
NULL
,
(
PreFetchProc
)
NULL
,
(
IsNullProc
)
NULL
,
(
SetValueProc
)
StringVar_SetValue
,
(
GetValueProc
)
StringVar_GetValue
,
(
GetBufferSizeProc
)
StringVar_GetBufferSize
,
(
BindObjectValueProc
)
StringVar_BindObjectValue
,
&
g_UnicodeStrType
,
// Python type
DSQL_C_NCHAR
,
MAX_STRING_CHARS
,
// element length (default)
1
,
// is character data
1
,
// is variable length
1
,
// can be copied
1
// can be in array
};
#endif
dm_VarType
vt_FixedChar
=
{
(
InitializeProc
)
NULL
,
(
FinalizeProc
)
NULL
,
(
PreDefineProc
)
NULL
,
(
PreFetchProc
)
NULL
,
(
IsNullProc
)
NULL
,
(
SetValueProc
)
StringVar_SetValue
,
(
GetValueProc
)
StringVar_GetValue
,
(
GetBufferSizeProc
)
StringVar_GetBufferSize
,
(
BindObjectValueProc
)
StringVar_BindObjectValue
,
&
g_FixedCharType
,
// Python type
DSQL_C_NCHAR
,
// c type
2000
,
// element length (default)
1
,
// is character data
0
,
// is variable length
1
,
// can be copied
1
// can be in array
};
#if
PY_MAJOR_VERSION
<
3
dm_VarType
vt_FixedUnicodeChar
=
{
(
InitializeProc
)
NULL
,
(
FinalizeProc
)
NULL
,
(
PreDefineProc
)
NULL
,
(
PreFetchProc
)
NULL
,
(
IsNullProc
)
NULL
,
(
SetValueProc
)
StringVar_SetValue
,
(
GetValueProc
)
StringVar_GetValue
,
(
GetBufferSizeProc
)
StringVar_GetBufferSize
,
(
BindObjectValueProc
)
StringVar_BindObjectValue
,
&
g_FixedUnicodeCharType
,
// Python type
DSQL_C_NCHAR
,
2000
,
// element length (default)
1
,
// is character data
0
,
// is variable length
1
,
// can be copied
1
// can be in array
};
#endif
/*
static dm_VarType vt_Rowid = {
(InitializeProc) StringVar_Initialize,
(FinalizeProc) NULL,
(PreDefineProc) NULL,
(PostDefineProc) NULL,
(PreFetchProc) NULL,
(IsNullProc) NULL,
(SetValueProc) StringVar_SetValue,
(GetValueProc) StringVar_GetValue,
(GetBufferSizeProc) StringVar_GetBufferSize,
&g_RowidVarType, // Python type
SQLT_CHR, // Oracle type
SQLCS_IMPLICIT, // charset form
18, // element length (default)
1, // is character data
0, // is variable length
1, // can be copied
1 // can be in array
};*/
dm_VarType
vt_Binary
=
{
(
InitializeProc
)
NULL
,
(
FinalizeProc
)
NULL
,
(
PreDefineProc
)
NULL
,
(
PreFetchProc
)
NULL
,
(
IsNullProc
)
NULL
,
(
SetValueProc
)
StringVar_SetValue
,
(
GetValueProc
)
StringVar_GetValue
,
(
GetBufferSizeProc
)
NULL
,
(
BindObjectValueProc
)
StringVar_BindObjectValue
,
&
g_BinaryType
,
// Python type
DSQL_C_BINARY
,
// c type
MAX_BINARY_BYTES
,
// element length (default)
0
,
// is character data
1
,
// is variable length
1
,
// can be copied
1
// can be in array
};
dm_VarType
vt_FixedBinary
=
{
(
InitializeProc
)
NULL
,
(
FinalizeProc
)
NULL
,
(
PreDefineProc
)
NULL
,
(
PreFetchProc
)
NULL
,
(
IsNullProc
)
NULL
,
(
SetValueProc
)
StringVar_SetValue
,
(
GetValueProc
)
StringVar_GetValue
,
(
GetBufferSizeProc
)
NULL
,
(
BindObjectValueProc
)
StringVar_BindObjectValue
,
&
g_FixedBinaryType
,
// Python type
DSQL_C_BINARY
,
// c type
2000
,
// element length (default)
0
,
// is character data
0
,
// is variable length
1
,
// can be copied
1
// can be in array
};
//-----------------------------------------------------------------------------
// StringVar_Initialize()
// Initialize the variable. dmVar_new里面会有alloc
//-----------------------------------------------------------------------------
/*
static
int
StringVar_Initialize(
dm_StringVar* var // variable to initialize
)
{
var->actualLength = (slength*) PyMem_Malloc(var->allocatedElements * sizeof(slength));
if (!var->actualLength)
{
PyErr_NoMemory();
return -1;
}
return 0;
}
*/
//-----------------------------------------------------------------------------
// StringVar_SetValue()
// Set the value of the variable.
//-----------------------------------------------------------------------------
static
int
StringVar_SetValue
(
dm_StringVar
*
var
,
// variable to set value for
unsigned
pos
,
// array position to set
PyObject
*
value
// value to set
)
{
dm_Buffer
buffer
;
// populate the buffer and confirm the maximum size is not exceeded
if
(
dmBuffer_FromObject
(
&
buffer
,
value
,
var
->
environment
->
encoding
)
<
0
)
return
-1
;
if
(
var
->
type
->
isCharacterData
&&
buffer
.
numCharacters
>
MAX_STRING_CHARS
)
{
dmBuffer_Clear
(
&
buffer
);
PyErr_SetString
(
PyExc_ValueError
,
"string data too large"
);
return
-1
;
}
else
if
(!
var
->
type
->
isCharacterData
&&
buffer
.
size
>
MAX_BINARY_BYTES
)
{
dmBuffer_Clear
(
&
buffer
);
PyErr_SetString
(
PyExc_ValueError
,
"binary data too large"
);
return
-1
;
}
// ensure that the buffer is large enough
if
(
buffer
.
size
>
(
Py_ssize_t
)
var
->
bufferSize
)
{
if
(
dmVar_Resize
( (
dm_Var
*
)
var
,
buffer
.
numCharacters
)
<
0
)
{
dmBuffer_Clear
(
&
buffer
);
return
-1
;
}
}
// keep a copy of the string
var
->
indicator
[
pos
]
=
(
slength
)
buffer
.
size
;
var
->
actualLength
[
pos
]
=
(
slength
)
buffer
.
size
;
if
(
buffer
.
size
)
{
memcpy
(
var
->
data
+
var
->
bufferSize
*
pos
,
buffer
.
ptr
,
buffer
.
size
);
}
dmBuffer_Clear
(
&
buffer
);
return
0
;
}
//-----------------------------------------------------------------------------
// StringVar_GetValue()
// Returns the value stored at the given array position.
//-----------------------------------------------------------------------------
static
PyObject
*
StringVar_GetValue
(
dm_StringVar
*
var
,
// variable to determine value for
unsigned
pos
// array position
)
{
char
*
data
;
data
=
var
->
data
+
pos
*
var
->
bufferSize
;
if
(
var
->
type
==
&
vt_Binary
||
var
->
type
==
&
vt_FixedBinary
)
return
PyBytes_FromStringAndSize
(
data
,
var
->
actualLength
[
pos
]);
/* 取到的值按照当前encoding直接返回，不管是否为unicode串 */
return
dmString_FromEncodedString
(
data
,
var
->
actualLength
[
pos
],
var
->
environment
->
encoding
);
}
#if
PY_MAJOR_VERSION
<
3
//-----------------------------------------------------------------------------
// StringVar_PostDefine()
// Set the character set information when values are fetched from this
// variable.
//-----------------------------------------------------------------------------
static
int
StringVar_PostDefine
(
dm_StringVar
*
var
)
{
/*
sword status;
//DSQL_ATTR_SQL_CHARSET
status = OCIAttrSet(var->defineHandle, OCI_HTYPE_DEFINE,
&var->type->charsetForm, 0, OCI_ATTR_CHARSET_FORM,
var->environment->errorHandle);
if (Environment_CheckForError(var->environment, status,
"StringVar_PostDefine(): setting charset form") < 0)
return -1;
*/
return
0
;
}
#endif
//-----------------------------------------------------------------------------
// StringVar_GetBufferSize()
// Returns the buffer size to use for the variable.
//-----------------------------------------------------------------------------
static
udint4
StringVar_GetBufferSize
(
dm_StringVar
*
self
)
// variable to get buffer size for
{
if
(
self
->
type
->
isCharacterData
)
return
self
->
size
*
self
->
environment
->
maxBytesPerCharacter
;
return
self
->
size
;
}
static
int
StringVar_BindObjectValue
(
dm_StringVar
*
var
,
unsigned
pos
,
dhobj
hobj
,
udint4
val_nth
)
{
DPIRETURN
rt
=
DSQL_SUCCESS
;
rt
=
dpi_set_obj_val
(
hobj
,
val_nth
,
var
->
type
->
cType
, (
dpointer
)((
sdbyte
*
)
var
->
data
+
var
->
bufferSize
*
pos
),
var
->
indicator
[
pos
]);
if
(
Environment_CheckForError
(
var
->
environment
,
hobj
,
DSQL_HANDLE_OBJECT
,
rt
,
"vCursor_BindObjectValue():dpi_set_obj_val"
)
<
0
)
{
return
-1
;
}
return
0
;
}
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