ocikp.h

将对Oracle数据库读写操作的OCI进行封装。不但具有普通数据的读取操作

sizep (OUT) - is the size of the attribute value. 
This can be passed in as NULL for most parameters as the size is well known. 
For OraText* parameters, a pointer to a ub4 must be passed in to get the length 
of the string. 
attrtype (IN) - is the type of attribute.
errhp (IN/OUT) - an error handle which can be passed to OCIErrorGet() for 
diagnostic information in the event of an error.
Related Functions
OCIAttrSet()

--------------------------------OCIAttrSet------------------------------------


OCIAttrSet()
Name
OCI Attribute Set
Purpose
This call is used to set a particular attribute of a handle or a descriptor. 
Syntax
sword OCIAttrSet ( dvoid       *trgthndlp,
                 ub4         trghndltyp,
                 dvoid       *attributep,
                 ub4         size,
                 ub4         attrtype,
                 OCIError    *errhp );
Comments
This call is used to set a particular attribute of a handle or a descriptor. 
See Appendix B for a list of handle types and their writeable attributes.
Parameters
trghndlp (IN/OUT) - the pointer to a handle type whose attribute gets 
modified. 
trghndltyp (IN/OUT) - is the handle type. 
attributep (IN) - a pointer to an attribute value. 
The attribute value is copied into the target handle. If the attribute value 
is a pointer, then only the pointer is copied, not the contents of the pointer.
size (IN) - is the size of an attribute value. This can be passed in as 0 for 
most attributes as the size is already known by the OCI library. For OraText*
attributes, a ub4 must be passed in set to the length of the string. 
attrtype (IN) - the type of attribute being set.
errhp (IN/OUT) - an error handle which can be passed to OCIErrorGet() for 
diagnostic information in the event of an error. 
Related Functions
OCIAttrGet()



--------------------------------OCIBindArrayOfStruct--------------------------



OCIBindArrayOfStruct()
Name
OCI Bind for Array of Structures
Purpose
This call sets up the skip parameters for a static array bind.
Syntax
sword OCIBindArrayOfStruct ( OCIBind     *bindp,
                           OCIError    *errhp,
                           ub4         pvskip, 
                           ub4         indskip, 
                           ub4         alskip, 
                           ub4         rcskip );
Comments
This call sets up the skip parameters necessary for a static array bind.
This call follows a call to OCIBindByName() or OCIBindByPos(). The bind 
handle returned by that initial bind call is used as a parameter for the 
OCIBindArrayOfStruct() call.
For information about skip parameters, see the section "Arrays of Structures" 
on page 4-16.
Parameters
bindp (IN) - the handle to a bind structure. 
errhp (IN) - an error handle which can be passed to OCIErrorGet() for 
diagnostic information in the event of an error.
pvskip (IN) - skip parameter for the next data value. 
indskip (IN) - skip parameter for the next indicator value or structure. 
alskip (IN) - skip parameter for the next actual length value. 
rcskip (IN) - skip parameter for the next column-level return code value. 
Related Functions
OCIAttrGet()


--------------------------------OCIBindByName---------------------------------


OCIBindByName()
Name
OCI Bind by Name
Purpose
Creates an association between a program variable and a placeholder in a SQL 
statement or PL/SQL block.
Syntax
sword OCIBindByName (
              OCIStmt       *stmtp, 
              OCIBind       **bindp,
              OCIError      *errhp,
              CONST OraText    *placeholder,
              sb4           placeh_len,
              dvoid         *valuep,
              sb4           value_sz,
              ub2           dty,
              dvoid         *indp,
              ub2           *alenp,
              ub2           *rcodep,
              ub4           maxarr_len,
              ub4           *curelep, 
              ub4           mode ); 
Description
This call is used to perform a basic bind operation. The bind creates an 
association between the address of a program variable and a placeholder in a 
SQL statement or PL/SQL block. The bind call also specifies the type of data 
which is being bound, and may also indicate the method by which data will be 
provided at runtime.
This function also implicitly allocates the bind handle indicated by the bindp 
parameter.
Data in an OCI application can be bound to placeholders statically or 
dynamically. Binding is static when all the IN bind data and the OUT bind 
buffers are well-defined just before the execute. Binding is dynamic when the 
IN bind data and the OUT bind buffers are provided by the application on 
demand at execute time to the client library. Dynamic binding is indicated by 
setting the mode parameter of this call to OCI_DATA_AT_EXEC.
Related Functions: For more information about dynamic binding, see 
the section "Runtime Data Allocation and Piecewise Operations" on 
page 5-16.
Both OCIBindByName() and OCIBindByPos() take as a parameter a bind handle, 
which is implicitly allocated by the bind call A separate bind handle is 
allocated for each placeholder the application is binding.
Additional bind calls may be required to specify particular attributes 
necessary when binding certain data types or handling input data in certain 
ways:
If arrays of structures are being utilized, OCIBindArrayOfStruct() must 
be called to set up the necessary skip parameters.
If data is being provided dynamically at runtime, and the application 
will be using user-defined callback functions, OCIBindDynamic() must 
be called to register the callbacks.
If a named data type is being bound, OCIBindObject() must be called to 
specify additional necessary information.
Parameters
stmth (IN/OUT) - the statement handle to the SQL or PL/SQL statement 
being processed.
bindp (IN/OUT) - a pointer to a pointer to a bind handle which is implicitly 
allocated by this call.  The bind handle  maintains all the bind information for 
this particular input value. The handle is feed implicitly when the statement 
handle is deallocated.
errhp (IN/OUT) - an error handle which can be passed to OCIErrorGet() for 
diagnostic information in the event of an error. 
placeholder (IN) - the placeholder attributes are specified by name if ocibindn() 
is being called.
placeh_len (IN) - the length of the placeholder name specified in placeholder.
valuep (IN/OUT) - a pointer to a data value or an array of data values of the 
type specified in the dty parameter. An array of data values can be specified 
for mapping into a PL/SQL table or for providing data for SQL multiple-row 
operations. When an array of bind values is provided, this is called an array 
bind in OCI terms. Additional attributes of the array bind (not bind to a 
column of ARRAY type) are set up in OCIBindArrayOfStruct() call. 
For a REF, named data type  bind, the valuep parameter is used only for IN 
bind data. The pointers to OUT buffers are set in the pgvpp parameter 
initialized by OCIBindObject(). For named data type and REF binds, the bind 
values are unpickled into the Object Cache. The OCI object navigational calls 
can then be used to navigate the objects and the refs in the Object Cache.
If the OCI_DATA_AT_EXEC mode is specified in the mode parameter, valuep 
is ignored for all data types. OCIBindArrayOfStruct() cannot be used and 
OCIBindDynamic() must be invoked to provide callback functions if desired. 
value_sz (IN) - the size of a data value. In the case of an array bind, this is the 
maximum size of any element possible with the actual sizes being specified in 
the alenp parameter. 
If the OCI_DATA_AT_EXEC mode is specified, valuesz defines the maximum 
size of the data that can be ever provided at runtime for data types other than 
named data types or REFs. 
dty (IN) - the data type of the value(s) being bound. Named data types 
(SQLT_NTY) and REFs (SQLT_REF) are valid only if the application has been 
initialized in object mode. For named data types, or REFs, additional calls 
must be made with the bind handle to set up the datatype-specific attributes.
indp (IN/OUT) - pointer to an indicator variable or array. For scalar data 
types, this is a pointer to sb2 or an array of sb2s. For named data types, 
this pointer is ignored and the actual pointer to the indicator structure or 
an array of indicator structures is initialized by OCIBindObject(). 
Ignored for dynamic binds.
See the section "Indicator Variables" on page 2-43 for more information about 
indicator variables.
alenp (IN/OUT) - pointer to array of actual lengths of array elements. Each 
element in alenp is the length of the data in the corresponding element in the 
bind value array before and after the execute. This parameter is ignored for 
dynamic binds.
rcodep (OUT) - pointer to array of column level return codes. This parameter 
is ignored for dynamic binds.
maxarr_len (IN) - the maximum possible number of elements of type dty in a 
PL/SQL binds. This parameter is not required for non-PL/SQL binds. If 
maxarr_len is non-zero, then either OCIBindDynamic() or 
OCIBindArrayOfStruct() can be invoked to set up additional bind attributes. 
curelep(IN/OUT) - a pointer to the actual number of elements. This parameter 
is only required for PL/SQL binds.
mode (IN) - the valid modes for this parameter are:
OCI_DEFAULT. This is default mode.
OCI_DATA_AT_EXEC. When this mode is selected, the value_sz 
parameter defines the maximum size of the data that can be ever 
provided at runtime. The application must be ready to provide the OCI 
library runtime IN data buffers at any time and any number of times. 
Runtime data is provided in one of the two ways:
callbacks using a user-defined function which must be registered 
with a subsequent call to OCIBindDynamic(). 
a polling mechanism using calls supplied by the OCI. This mode 
is assumed if no callbacks are defined.
For more information about using the OCI_DATA_AT_EXEC mode, see 
the section "Runtime Data Allocation and Piecewise Operations" on 
page 5-16.
When the allocated buffers are not required any more, they should be 
freed by the client. 
Related Functions
OCIBindDynamic(), OCIBindObject(), OCIBindArrayOfStruct(), OCIAttrGet()


-------------------------------OCIBindByPos----------------------------------


OCIBindByPos()
Name
OCI Bind by Position
Purpose
Creates an association between a program variable and a placeholder in a SQL 
statement or PL/SQL block.
Syntax
sword OCIBindByPos ( 
              OCIStmt      *stmtp, 
              OCIBind      **bindp,
              OCIError     *errhp,
              ub4          position,
              dvoid        *valuep,
              sb4          value_sz,
              ub2          dty,
              dvoid        *indp,
              ub2          *alenp,
              ub2          *rcodep,
              ub4          maxarr_len,
              ub4          *curelep, 
              ub4          mode);

Description
This call is used to perform a basic bind operation. The bind creates an 
association between the address of a program variable and a placeholder in a 
SQL statement or PL/SQL block. The bind call also specifies the type of data 
which is being bound, and may also indicate the method by which data will be 
provided at runtime.
This function also implicitly allocates the bind handle indicated by the bindp 
parameter.
Data in an OCI application can be bound to placeholders statically or 
dynamically. Binding is static when all the IN bind data and the OUT bind 
buffers are well-defined just before the execute. Binding is dynamic when the 
IN bind data and the OUT bind buffers are provided by the application on 
demand at execute time to the client library. Dynamic binding is indicated by 
setting the mode parameter of this call to OCI_DATA_AT_EXEC.
Related Functions: For more information about dynamic binding, see 
the section "Runtime Data Allocation and Piecewise Operations" on 
page 5-16
Both OCIBindByName() and OCIBindByPos() take as a parameter a bind handle, 
which is implicitly allocated by the bind call A separate bind handle is 
allocated for each placeholder the application is binding.
Additional bind calls may be required to specify particular attributes 
necessary when binding certain data types or handling input data in certain 
ways:
If arrays of structures are being utilized, OCIBindArrayOfStruct() must 
be called to set up the necessary skip parameters.
If data is being provided dynamically at runtime, and the application 
will be using user-defined callback functions, OCIBindDynamic() must 
be called to register the callbacks.
If a named data type is being bound, OCIBindObject() must be called to 
specify additional necessary information.
Parameters
stmth (IN/OUT) - the statement handle to the SQL or PL/SQL statement 
being processed.
bindp (IN/OUT) - a pointer to a pointer to a bind handle which is implicitly 
allocated by this call.  The bind handle  maintains all the bind information for 
this particular input value. The handle is feed implicitly when the statement 
handle is deallocated.
errhp (IN/OUT) - an error handle which can be passed to OCIErrorGet() for 
diagnostic information in the event of an error.