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//-----------------------------------------------------------------------------
// Copyright (c) 2016, 2022, Oracle and/or its affiliates.
//
// This software is dual-licensed to you under the Universal Permissive License
// (UPL) 1.0 as shown at https://oss.oracle.com/licenses/upl and Apache License
// 2.0 as shown at http://www.apache.org/licenses/LICENSE-2.0. You may choose
// either license.
//
// If you elect to accept the software under the Apache License, Version 2.0,
// the following applies:
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
// DemoDMLReturning.c
// Demos DML returning clause which returns multiple rows.
//-----------------------------------------------------------------------------
#include "SampleLib.h"
#define SQL_TEXT_1 "truncate table DemoTempTable"
#define SQL_TEXT_2 "begin " \
" for i in 1..10 loop " \
" insert into DemoTempTable values (i, " \
" 'Demo String ' || i); " \
" end loop; " \
"end;"
#define SQL_TEXT_3 "delete from DemoTempTable " \
"where IntCol <= :inIntCol " \
"returning IntCol, StringCol " \
"into :outIntCol, :outStrCol"
//-----------------------------------------------------------------------------
// main()
//-----------------------------------------------------------------------------
int main(int argc, char **argv)
{
dpiData *inIntColData, *outIntColData, *outStrColData;
dpiVar *inIntColVar, *outIntColVar, *outStrColVar;
uint32_t numQueryColumns, numRows, i;
dpiStmt *stmt;
dpiConn *conn;
// connect to database
conn = dpiSamples_getConn(1, NULL);
// truncate table
printf("Truncating table...\n");
if (dpiConn_prepareStmt(conn, 0, SQL_TEXT_1, strlen(SQL_TEXT_1), NULL, 0,
&stmt) < 0)
return dpiSamples_showError();
if (dpiStmt_execute(stmt, 0, &numQueryColumns) < 0)
return dpiSamples_showError();
dpiStmt_release(stmt);
// populate table
printf("Populating table...\n");
if (dpiConn_prepareStmt(conn, 0, SQL_TEXT_2, strlen(SQL_TEXT_2), NULL, 0,
&stmt) < 0)
return dpiSamples_showError();
if (dpiStmt_execute(stmt, 0, &numQueryColumns) < 0)
return dpiSamples_showError();
dpiStmt_release(stmt);
// create variables
if (dpiConn_newVar(conn, DPI_ORACLE_TYPE_NUMBER, DPI_NATIVE_TYPE_INT64, 1,
0, 0, 0, NULL, &inIntColVar, &inIntColData) < 0)
return dpiSamples_showError();
if (dpiConn_newVar(conn, DPI_ORACLE_TYPE_NUMBER, DPI_NATIVE_TYPE_INT64, 1,
0, 0, 0, NULL, &outIntColVar, &outIntColData) < 0)
return dpiSamples_showError();
if (dpiConn_newVar(conn, DPI_ORACLE_TYPE_VARCHAR, DPI_NATIVE_TYPE_BYTES, 1,
100, 0, 0, NULL, &outStrColVar, &outStrColData) < 0)
return dpiSamples_showError();
// prepare and execute delete statement with DML returning clause
printf("Deleting rows with DML returning...\n");
if (dpiConn_prepareStmt(conn, 0, SQL_TEXT_3, strlen(SQL_TEXT_3), NULL, 0,
&stmt) < 0)
return dpiSamples_showError();
inIntColData->isNull = 0;
inIntColData->value.asInt64 = 4;
if (dpiStmt_bindByPos(stmt, 1, inIntColVar) < 0)
return dpiSamples_showError();
if (dpiStmt_bindByPos(stmt, 2, outIntColVar) < 0)
return dpiSamples_showError();
if (dpiStmt_bindByPos(stmt, 3, outStrColVar) < 0)
return dpiSamples_showError();
if (dpiStmt_execute(stmt, 0, &numQueryColumns) < 0)
return dpiSamples_showError();
// get the data and number of rows returned
if (dpiVar_getReturnedData(outIntColVar, 0, &numRows, &outIntColData) < 0)
return dpiSamples_showError();
if (dpiVar_getReturnedData(outStrColVar, 0, &numRows, &outStrColData) < 0)
return dpiSamples_showError();
printf("%d rows returned.\n", numRows);
// display the output from the rows
for (i = 0; i < numRows; i++)
printf("IntCol = %" PRId64 ", StrCol = %.*s\n",
outIntColData[i].value.asInt64,
outStrColData[i].value.asBytes.length,
outStrColData[i].value.asBytes.ptr);
// clean up
dpiVar_release(inIntColVar);
dpiVar_release(outIntColVar);
dpiVar_release(outStrColVar);
dpiStmt_release(stmt);
dpiConn_release(conn);
printf("Done.\n");
return 0;
}
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