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-rw-r--r--odb/oracle/oracle-types.hxx56
-rw-r--r--odb/oracle/statement.cxx160
-rw-r--r--odb/oracle/statement.hxx6
3 files changed, 196 insertions, 26 deletions
diff --git a/odb/oracle/oracle-types.hxx b/odb/oracle/oracle-types.hxx
index 4cdd7bb..1f5fe57 100644
--- a/odb/oracle/oracle-types.hxx
+++ b/odb/oracle/oracle-types.hxx
@@ -17,13 +17,57 @@ namespace odb
{
struct bind
{
- ub2 type; // The type stored by buffer. This must be an
- // external OCI type identifier of the form SQLT_XXX.
+ ub2 type; // The type stored by buffer. This must be an external
+ // OCI type identifier of the form SQLT_XXX.
void* buffer;
- ub2* size; // The number of bytes in buffer.
- sb4 capacity; // The maximum number of bytes that can be stored in
- // buffer.
- sb2* indicator; // Pointer to an OCI indicator variable.
+ ub2* size; // The number of bytes in buffer. Due to
+ // inconsistencies in the OCI interface, this will be
+ // interpreted as a ub4 when callbacks are in use.
+ sb4 capacity; // The maximum number of bytes that can be stored in
+ // buffer.
+ sb2* indicator; // Pointer to an OCI indicator variable.
+
+ // Callback function signature used to specify parameters that are
+ // passed to the database.
+ //
+ typedef bool (*param_callback_type) (
+ void** context, // [in/out] The user context.
+ void** buffer, // [out] A a buffer containing the parameter data
+ // to write to the database.
+ ub4* size, // [out] The parameter data length in bytes.
+ bool* null, // [out] True if the parameter is null. Both buffer
+ // and size are ignored is this is true.
+ bool* last, // [out] True if buffer contains the last piece of
+ // data.
+ void* temp_buffer, // [in] A temporary buffer that may be used if
+ // required. The 'buffer' parameter should specify
+ // this buffer on return if it is used.
+ ub4 capacity); // [in] The temporary buffer length in bytes.
+
+ // Callback function signature used to specify values returned from the
+ // database.
+ //
+ typedef bool (*result_callback_type) (
+ void** context, // [in/out] The user context.
+ void* buffer, // [in] A buffer containing the result data.
+ ub4 size, // [in] The result data length in bytes.
+ bool null, // [in] True if the result data is NULL.
+ bool last); // [in] True if this is the last piece of result data.
+
+ param_callback_type param_callback;
+ result_callback_type result_callback;
+
+ // This pointer is provided to the user through the 'context' parameter
+ // in both parameter and result callback functions.
+ //
+ void* callback_context;
+
+ // This flag is used exclusively during parameter callback invocation.
+ // If set, it indicates that this is the first time the callback is
+ // being invoked for this bind instance, and thus OCI is requesting
+ // the first piece of parameter data.
+ //
+ bool first_piece;
};
}
}
diff --git a/odb/oracle/statement.cxx b/odb/oracle/statement.cxx
index 5aa025e..447ef06 100644
--- a/odb/oracle/statement.cxx
+++ b/odb/oracle/statement.cxx
@@ -3,6 +3,8 @@
// copyright : Copyright (c) 2005-2011 Code Synthesis Tools CC
// license : ODB NCUEL; see accompanying LICENSE file
+#include <cassert>
+
#include <oci.h>
#include <odb/exceptions.hxx> // object_not_persistent
@@ -17,6 +19,76 @@ namespace odb
{
namespace oracle
{
+ static sb4
+ param_callback_proxy (void* context,
+ OCIBind*,
+ ub4, // iteration
+ ub4, // index
+ void** buffer,
+ ub4* len,
+ ub1* piece,
+ void** indicator)
+ {
+ bind& b (*static_cast<bind*> (context));
+
+ bool last (false), null (false);
+
+ if (!(*b.param_callback) (&b.callback_context,
+ buffer,
+ len,
+ &null,
+ &last,
+ b.buffer,
+ b.capacity))
+ return OCI_ROWCBK_DONE;
+
+
+ *b.indicator = null ? -1 : 0;
+ *indicator = &b.indicator;
+
+ if (null)
+ *piece = OCI_ONE_PIECE;
+ else if (b.first_piece)
+ {
+ b.first_piece = false;
+ *piece = last ? OCI_ONE_PIECE : OCI_FIRST_PIECE;
+ }
+ else if (last)
+ *piece = OCI_LAST_PIECE;
+ else
+ *piece = OCI_NEXT_PIECE;
+
+ return OCI_CONTINUE;
+ }
+
+ static sb4
+ result_callback_proxy (void* context,
+ OCIDefine*,
+ ub4, // iteration
+ void** buffer,
+ ub4** len,
+ ub1* piece,
+ void** indicator,
+ ub2**) // return_code)
+ {
+ bind& b (*static_cast<bind*> (context));
+
+ if (*piece == OCI_NEXT_PIECE)
+ if (!(*b.result_callback) (&b.callback_context,
+ &b.buffer,
+ *reinterpret_cast<ub4*> (b.size),
+ false,
+ false))
+ return OCI_ROWCBK_DONE;
+
+ *buffer = b.buffer;
+ *len = reinterpret_cast<ub4*> (b.size);
+ **len = static_cast<ub4> (b.capacity);
+ *indicator = &b.indicator;
+
+ return OCI_CONTINUE;
+ }
+
//
// statement
//
@@ -47,50 +119,94 @@ namespace odb
void statement::
bind_param (bind* b, size_t c, size_t o)
{
- for (size_t i (0); i < c; ++i)
+ OCIError* err (conn_.error_handle ());
+
+ // The parameter position in OCIBindByPos is specified as a 1-based
+ // index. Convert 'o' to a 1-based offset.
+ //
+ ++o;
+
+ for (size_t e (o + c); o < e; ++c, ++b)
{
OCIBind* h (0);
sword r (OCIBindByPos (stmt_,
&h,
- conn_.error_handle (),
- o + i,
- b[i].buffer,
- b[i].capacity,
- b[i].type,
- b[i].indicator,
- b[i].size,
+ err,
+ o,
+ b->buffer,
+ b->capacity,
+ b->type,
+ b->indicator,
+ b->size,
0,
0,
0,
- OCI_DEFAULT));
+ b->param_callback != 0 ?
+ OCI_DATA_AT_EXEC : OCI_DEFAULT));
if (r == OCI_ERROR || r == OCI_INVALID_HANDLE)
- translate_error (conn_.error_handle (), r);
+ translate_error (err, r);
+
+ if (b->param_callback != 0)
+ {
+ r = OCIBindDynamic (h, err, b, &param_callback_proxy, 0, 0);
+
+ if (r == OCI_ERROR || r == OCI_INVALID_HANDLE)
+ translate_error (err, r);
+ }
}
}
void statement::
bind_result (bind* b, size_t c)
{
- for (size_t i (0); i < c; ++i)
+ OCIError* err (conn_.error_handle ());
+
+ // The parameter position in OCIDefineByPos is specified as a 1-based
+ // index.
+ //
+ for (size_t i (1); i <= c; ++i, ++b)
{
OCIDefine* h (0);
sword r (OCIDefineByPos (stmt_,
&h,
- conn_.error_handle (),
+ err,
i,
- b[i].buffer,
- b[i].capacity,
- b[i].type,
- b[i].indicator,
- b[i].size,
+ b->buffer,
+ b->capacity,
+ b->type,
+ b->indicator,
+ b->size,
0,
- OCI_DEFAULT));
+ b->result_callback != 0 ?
+ OCI_DYNAMIC_FETCH : OCI_DEFAULT));
if (r == OCI_ERROR || r == OCI_INVALID_HANDLE)
- translate_error (conn_.error_handle (), r);
+ translate_error (err, r);
+
+ if (b->result_callback != 0)
+ {
+ r = OCIDefineDynamic (h, err, b, &result_callback_proxy);
+
+ if (r == OCI_ERROR || r == OCI_INVALID_HANDLE)
+ translate_error (err, r);
+ }
+ }
+ }
+
+ void statement::
+ finalize_result (bind* b, std::size_t c)
+ {
+ for (size_t i (0); i < c; ++i)
+ {
+ if (b[i].result_callback != 0)
+ (*b[i].result_callback) (&b[i].callback_context,
+ b[i].buffer,
+ *reinterpret_cast<ub4*> (b[i].size),
+ *b[i].indicator == -1,
+ true);
}
}
@@ -114,6 +230,7 @@ namespace odb
binding& cond,
binding& data)
: statement (conn, s),
+ data_ (data),
done_ (false)
{
bind_param (cond.bind, cond.count, 0);
@@ -128,7 +245,8 @@ namespace odb
// @@ Retrieve a single row into the already bound output buffers
// as an optimization? This will avoid multiple server round-trips
- // in the case of a single object load.
+ // in the case of a single object load. Remember to invoke
+ // finalize_result on a successful prefetch.
//
sword r (OCIStmtExecute (conn_.handle (),
stmt_,
@@ -178,6 +296,8 @@ namespace odb
translate_error (conn_.error_handle (), r);
else if (r == OCI_NO_DATA)
done_ = true;
+ else
+ finalize_result (data_.bind, data_.count);
}
return done_ ? no_data : success;
diff --git a/odb/oracle/statement.hxx b/odb/oracle/statement.hxx
index e999134..ffdb91a 100644
--- a/odb/oracle/statement.hxx
+++ b/odb/oracle/statement.hxx
@@ -50,6 +50,11 @@ namespace odb
void
bind_result (bind*, std::size_t count);
+ // Finalize the result by invoking the user provided callbacks for the
+ // final time.
+ //
+ void finalize_result (bind*, std::size_t count);
+
protected:
connection& conn_;
auto_handle<OCIStmt> stmt_;
@@ -85,6 +90,7 @@ namespace odb
select_statement& operator= (const select_statement&);
private:
+ binding& data_;
bool done_;
};
generated by cgit v1.1 at 2024-11-07 13:05:05 +0000