使用执行时数据将数据作为表值参数发送 (ODBC)

项目
05/08/2013

这类似于全部在内存中执行过程，但将执行时数据用作表值参数。

若要查看演示表值参数的另一个示例，请参阅使用表值参数 (ODBC)。

在此示例中，当调用 SQLExecute 或 SQLExecDirect 时，驱动程序返回 SQL_NEED_DATA。然后，应用程序反复调用 SQLParamData，直到该驱动程序返回除 SQL_NEED_DATA 以外的值为止。驱动程序返回 ParameterValuePtr 以通知应用程序它请求的是哪个参数的数据。应用程序调用 SQLPutData 以提供相应参数数据，然后再接着调用 SQLParamData。对于表值参数，对 SQLPutData 的调用指示为驱动程序准备的行数（在本示例中，始终为 1）。将表值的所有行传递到驱动程序之后，将调用 SQLPutData 以指示没有可用的行。

可以在表值行内使用执行时数据值。 SQLParamData 返回的值通知应用程序驱动程序所需的值。与常规参数值一样，可以针对字符或二进制表值列值一次或多次调用 SQLPutData。这样，应用程序可以分块传递较大值。

当针对表值调用 SQLPutData 时，DataPtr 用于可用的行数（在本示例中，始终为 1）。 StrLen_or_IndPtr 必须始终为 0。当传递了表值的所有行之后，将调用 SQLPutData，并且 DataPtr 值为 0。

前提条件

该过程假定已在服务器上执行以下 Transact-SQL：

create type TVParam as table(ProdCode integer, Qty integer)
create procedure TVPOrderEntry(@CustCode varchar(5), @Items TVPParam, 
            @OrdNo integer output, @OrdDate datetime output)
         as 
         set @OrdDate = GETDATE();
         insert into TVPOrd (OrdDate, CustCode) values (@OrdDate, @CustCode) output OrdNo); 
         select @OrdNo = SCOPE_IDENTITY(); 
         insert into TVPItem (OrdNo, ProdCode, Qty)
select @OrdNo, @Items.ProdCode, @Items.Qty 
from @Items

发送数据

声明 SQL 参数的变量。在本示例中，表值参数的缓冲区不必为数组；本示例每次传递一行数据。

SQLRETURN r;

// Variables for SQL parameters:
SQLCHAR CustCode[6];
SQLCHAR *TVP = (SQLCHAR *) "TVPInParam";
SQLINTEGER ProdCode, Qty;
SQLINTEGER OrdNo;
char *OrdDate[23];
SQLCHAR *TVP = (SQLCHAR *) "TVParam";
SQLINTEGER ItemNo;
// Variables for indicator/length variables associated with parameters:
SQLLEN cbCustCode, cbTVP, cbProdCode, cbQty, cbOrdNo, cbOrdDate, cbItemNo;
// Token returned by SQLParamData to indicate which param data is needed for:
SQLPOINTER ParamId;

绑定参数。 ColumnSize 为 1，表示每次最多传递一行。

// Bind parameters for call to TVPOrderEntryByRow.
r = SQLBindParameter(hstmt, 1, SQL_C_CHAR, SQL_PARAM_INPUT,SQL_VARCHAR, 5, 0, CustCode, sizeof(CustCode), &cbCustCode);

// 2 - Items TVP
r = SQLBindParameter(hstmt, 
    2,         // ParameterNumber
    SQL_C_DEFAULT,   // InputOutputType
    SQL_PARAM_INPUT,   // ValueType 
    SQL_SS_TABLE,   // Parametertype
    1,         // ColumnSize: For a table-valued parameter this the row array size.
    0,         // DecimalDigits: For a table-valued parameter this is always 0. 
    TVP,      // ParameterValuePtr: For a table-valued parameter this is the type name of the TVP,
         //      and also a token returned by SQLParamData.
    SQL_NTS,      // BufferLength: For a table-valued parameter this is the length of the type name or SQL_NTS.
    &cbTVP);      // StrLen_or_IndPtr: For a table-valued parameter this is the number of rows input and output.

// 3 - OrdNo output
r = SQLBindParameter(hstmt, 3, SQL_PARAM_OUTPUT, SQL_C_LONG, SQL_INTEGER, 0, 0, &OrdNo,
    sizeof(SQLINTEGER), &cbOrdNo);
// 4- OrdDate output
r = SQLBindParameter(hstmt, 4, SQL_PARAM_OUTPUT, SQL_C_CHAR, SQL_TYPE_TIMESTAMP, 23, 3, &OrdDate,
    sizeof(OrdDate), &cbOrdDate);

绑定表值参数的列。

// Bind the table-valued parameter columns.
// First set focus on param 2
r = SQLSetStmtAttr(hstmt, SQL_SOPT_SS_PARAM_FOCUS, (SQLPOINTER) 2, SQL_IS_INTEGER);

// ProdCode
r = SQLBindParameter(hstmt, 1, SQL_PARAM_INPUT, SQL_C_LONG, SQL_INTEGER, 0, 0, &ProdCode,
    sizeof(SQLINTEGER), &cbProdCode);
// Qty
r = SQLBindParameter(hstmt, 2, SQL_PARAM_INPUT, SQL_C_LONG, SQL_INTEGER, 0, 0, &Qty, 
   sizeof(SQLINTEGER), &cbQty);

// Reset param focus
r = SQLSetStmtAttr(hstmt, SQL_SOPT_SS_PARAM_FOCUS, (SQLPOINTER) 0, SQL_IS_INTEGER);

初始化参数。本示例将表值参数的大小设置为 SQL_DATA_AT_EXEC，而非行计数。

// Initialze the TVP for row streaming.
cbTVP = SQL_DATA_AT_EXEC;

// Populate non-data-at-exec parameters.
strcpy_s((char *) CustCode ,sizeof(CustCode), "CUST1"); cbCustCode = SQL_NTS;

调用该过程。 SQLExecDirect 将返回 SQL_NEED_DATA，这是因为表值参数是执行时数据参数。
```
// Call the procedure
r = SQLExecDirect(hstmt, (SQLCHAR *) "{call TVPOrderEntry(?, ?, ?, ?)}",SQL_NTS);
```

提供执行时数据参数的数据。当 SQLParamData 针对表值参数返回 ParameterValuePtr 时，应用程序必须准备下一行或多行表值的列。然后，应用程序调用 SQLPutData，并将 DataPtr 设置为可用的行数（在本示例中为 1），并将 StrLen_or_IndPtr 设置为 0。

// Check if parameter data is required, and get the first parameter ID token
if (r == SQL_NEED_DATA) {
    r = SQLParamData(hstmt, &ParamId);
}

// Supply parameter row data.
int rowNum = 0;
while (r == SQL_NEED_DATA) {
    if (ParamId == TVP) {
   switch (rowNum) {
       case 0: // Supply data for 1st row
      // Populate input table-valued parameter row constituent columns.
      ProdCode = 1215;   cbProdCode = sizeof(SQLINTEGER); 
      Qty = 5;      cbQty = sizeof(SQLINTEGER);
      // Returning 1 for StrLenOrIndPtr indicates that a row is available.
      r = SQLPutData(hstmt, (SQLPOINTER) 1, 1);
      rowNum++;
      break;

       case 1: // Supply data for the second row.
      // Populate another table-valued parameter row as above.
      ProdCode = 1017;   cbProdCode = sizeof(SQLINTEGER); 
      // This time supply Qty through SQLPutData.
      Qty = 0;      cbQty = SQL_DATA_AT_EXEC; 
      r = SQLPutData(hstmt, (SQLPOINTER) 1, 1);
      rowNum++;
      break;

    default:
      // Passing 0 in StrLenOrIndPtr indicates that no more table-valued parameter rows are available.
      r = SQLPutData(hstmt, (SQLPOINTER) 1, 0);
      break;
       }
    }
    else {
       if (ParamId == &Qty) {
      Qty = 2;
      // For a character or binary parameter, SQLPutData could be called
      // multiple times to pass the value in pieces.
      SQLPutData(hstmt, &Qty, sizeof(SQLINTEGER));
       }
   }
   // Signal that parameter data is available, and get the token for 
   // the next parameter.
   r = SQLParamData(hstmt, &ParamId);
    }
}

示例

说明

此示例演示您可以对 ODBC TVP 使用行流式处理（对 SQLPutData 的每个调用对应一行），这类似于您使用 BCP.exe 将数据加载到数据库中。

在构建此示例之前，请更改连接字符串中的服务器名称。

此示例使用默认数据库。在运行此示例之前，请在您将使用的数据库中运行以下命令：

create table MCLOG (
   biSeqNo bigint, 
   iSeries int, 
   bmRestData varbinary(max)
)
go

-- Table type definition
create type MCLOGType 
   as table(biSeqNo bigint, iSeries int, bmRestData varbinary(max) )
go

-- Insert procedure
create procedure MCLOGInsert (@TableVariable MCLOGType READONLY)
   as
   insert into MCLog(biSeqNo,  iSeries, bmRestData) 
   select biSeqNo, iSeries, bmRestData from @TableVariable  
go

代码

#define UNICODE
#define _UNICODE
#define _SQLNCLI_ODBC_

#include <windows.h>
#include <tchar.h>
#include <sqlext.h>
#include "sqlncli.h"

// link to sqlncli11.lib

#define SUCCESS(x) ( \
   !((x) & 0xFFFE) \
   )

#define CHKRC(stmt) { \
   rc = (stmt); \
   if (!SUCCESS(rc)) { \
      _tprintf(_T(#stmt) _T(" failed with rc = %ld\r\n"), rc); \
      goto EXIT; \
   } \
};

void PrintError(SQLSMALLINT HandleType, SQLHANDLE Handle) {
   RETCODE rc = SQL_SUCCESS;
   SQLTCHAR szSqlState[6];
   SQLTCHAR szMessage[1024];
   SQLSMALLINT i = 1;
   SQLSMALLINT msgLen = 0;
   SQLINTEGER NativeError;

   i = 1;
   while ( (rc = SQLGetDiagRec(HandleType, Handle, i, szSqlState, &NativeError, szMessage, sizeof(szMessage)/sizeof(SQLTCHAR), &msgLen)) != SQL_NO_DATA) {
      if (!SUCCESS(rc))
         break;
      szMessage[msgLen] = 0;
      szSqlState[5] = 0;
      _tprintf(_T("SQLState=%s, NativeError=%ld, Message=%s\r\n"), szSqlState, NativeError, szMessage);
      i++;
   }
}

int main() {
   RETCODE rc = SQL_SUCCESS;
   HENV henv = SQL_NULL_HENV;
   HDBC hdbc = SQL_NULL_HDBC;
   SQLHSTMT hstmt = SQL_NULL_HSTMT;
   SQLTCHAR * pszConnection = _T("DRIVER={SQL Server Native Client 10.0};Server=your_servername;Trusted_Connection=Yes;");

   // insert one TVP parameter
   SQLTCHAR * pszInsertStmt = _T("{call MCLOGInsert(?)}");
   SQLLEN cbParamLength;
   SQLULEN cMaxRows = 3;

   CHKRC(SQLAllocHandle(SQL_HANDLE_ENV, SQL_NULL_HENV, &henv));
   CHKRC(SQLSetEnvAttr(henv, SQL_ATTR_ODBC_VERSION, (SQLPOINTER)SQL_OV_ODBC3, 0));
   CHKRC(SQLAllocHandle(SQL_HANDLE_DBC, henv, &hdbc));
   CHKRC(SQLSetConnectAttr(hdbc, SQL_ATTR_LOGIN_TIMEOUT,reinterpret_cast<SQLPOINTER>(60),SQL_IS_UINTEGER));
   CHKRC(SQLDriverConnect(hdbc, NULL, pszConnection, SQL_NTS, NULL, 0, NULL, SQL_DRIVER_NOPROMPT));
   CHKRC(SQLAllocHandle(SQL_HANDLE_STMT, hdbc, &hstmt));
   CHKRC(SQLPrepare(hstmt, pszInsertStmt, SQL_NTS));

   // Bind the first parameter
   CHKRC(SQLBindParameter(hstmt, 1, SQL_PARAM_INPUT, SQL_C_DEFAULT, SQL_SS_TABLE, cMaxRows, 0, (SQLPOINTER)1, 0, &cbParamLength));
   // If the stored procedure is executed as T-SQL ("exec sp_insert ?, ?"), you will supply the type name.
   // CHKRC(SQLBindParameter(hstmt, 1, SQL_PARAM_INPUT, SQL_C_DEFAULT, SQL_SS_TABLE, cMaxRows, 0, (SQLPOINTER)lpszTVPParamType, SQL_NTS, &cbParamLengths));

   // bind TVP columns
   CHKRC(SQLSetStmtAttr(hstmt, SQL_SOPT_SS_PARAM_FOCUS, (SQLPOINTER)1, SQL_IS_INTEGER));

   // for each TVP column, you can define an array to send more than one row for each SQLPutData call.
   LONGLONG llSeqNo;
   SQLLEN cbSeqNo = sizeof(LONGLONG);
   LONG lSeries;
   SQLLEN cbSeries = sizeof(LONG);
   BYTE rgbRestData[2048];
   SQLLEN cbRestData = SQL_DATA_AT_EXEC;
   SQLUSMALLINT iColumn = 1;

   // Bind biSeqNo 
   CHKRC(SQLBindParameter(hstmt, iColumn, SQL_PARAM_INPUT, SQL_C_SBIGINT, SQL_BIGINT, sizeof(LONGLONG), 0, (SQLPOINTER)&llSeqNo, sizeof(llSeqNo), &cbSeqNo));

   // Bind iSeries 
   iColumn++;
   CHKRC(SQLBindParameter(hstmt, iColumn, SQL_PARAM_INPUT, SQL_C_SLONG, SQL_INTEGER, sizeof(LONG), 0, (SQLPOINTER)&lSeries, sizeof(lSeries), &cbSeries));

   // Bind bmRestData 
   iColumn++;
   CHKRC(SQLBindParameter(hstmt, iColumn, SQL_PARAM_INPUT, SQL_C_BINARY, SQL_VARBINARY, 0, 0, (SQLPOINTER)rgbRestData, 0, &cbRestData));
   CHKRC(SQLSetStmtAttr(hstmt, SQL_SOPT_SS_PARAM_FOCUS, (SQLPOINTER)0, SQL_IS_INTEGER));

   // Set cbParamLength to SQL_DATA_AT_EXEC to indicate the TVP parameter is bound as DAE.
   cbParamLength = SQL_DATA_AT_EXEC;
   rc = SQLExecute(hstmt);

   if (rc == SQL_NEED_DATA) {
      SQLPOINTER ptr = NULL;
      SQLULEN cRows = 0;

      rc = ::SQLParamData(hstmt, &ptr);

      while (rc == SQL_NEED_DATA) {
         if (ptr == (SQLPOINTER)1) {
            // it is the TVP parameter
            if (cRows == cMaxRows) {
               // We finish sending the last row already.
               CHKRC(::SQLPutData(hstmt, NULL, 0));
            }
            else {
               // StrLen_or_IndPtr can be changed to SQL_DATA_AT_EXEC or to a byte length before sending
               // the actual TVP rows. SQL_DATA_AT_EXEC means send DAE data.
               llSeqNo = cRows;
               cbSeqNo = sizeof(LONGLONG);   // send as bound TVP column
               lSeries = cRows + 100;
               cbSeries = sizeof(LONG);   // send as bound TVP column
               cbRestData = SQL_DATA_AT_EXEC;   // send as DAE TVP column
               CHKRC(::SQLPutData(hstmt, (SQLPOINTER)1, 1));
               cRows++;
            }
         }
         else if (ptr == (SQLPOINTER)rgbRestData)
            // varbinary(max) column.  Send data in parts.
            for ( int i = 0 ; i < 3 ; i++ ) {
               // Obtain the data in part from somewhere, here we just set all bytes to 'a'.
               ::memset(rgbRestData, 'a', sizeof(rgbRestData));
               CHKRC(::SQLPutData(hstmt, (SQLPOINTER)rgbRestData, sizeof(rgbRestData)));
            }
         else 
            // handling other DAE parameters, but in our case, we don't have other DAE parameters.
            goto EXIT;
         rc = ::SQLParamData(hstmt, &ptr);
      }
   }

   if (hstmt)
      SQLFreeHandle(SQL_HANDLE_STMT, hstmt);
   if (hdbc) {
      SQLDisconnect(hdbc);
      SQLFreeHandle(SQL_HANDLE_DBC, hdbc);
   }
   if (henv)
      SQLFreeHandle(SQL_HANDLE_ENV, henv);

EXIT:
   if (!SUCCESS(rc)) {
      if (hstmt)
         PrintError(SQL_HANDLE_STMT, hstmt);
      if (hdbc)
         PrintError(SQL_HANDLE_DBC, hdbc);
      if(henv)
         PrintError(SQL_HANDLE_ENV, henv);
   }
}

示例

说明

此示例演示您可以对 ODBC TVP 使用行流式处理（对 SQLPutData 的每个调用对应多行），这类似于您使用 BCP.exe 将数据加载到数据库中。

在构建此示例之前，请更改连接字符串中的服务器名称。

此示例使用默认数据库。在运行此示例之前，请在您将使用的数据库中运行以下命令：

create table MCLOG (
   biSeqNo bigint, 
   iSeries int, 
   bmRestData varbinary(max)
)
go

-- Table type definition
create type MCLOGType 
   as table(biSeqNo bigint, iSeries int, bmRestData varbinary(max) )
go

-- Insert procedure
create procedure MCLOGInsert (@TableVariable MCLOGType READONLY)
   as
   insert into MCLog(biSeqNo,  iSeries, bmRestData) 
   select biSeqNo, iSeries, bmRestData from @TableVariable  
go

代码

#define UNICODE
#define _UNICODE
#define _SQLNCLI_ODBC_

#include <windows.h>
#include <tchar.h>
#include <sqlext.h>
#include "sqlncli.h"

// link to sqlncli11.lib

#define SUCCESS(x) ( \
   !((x) & 0xFFFE) \
   )

#define CHKRC(stmt) { \
   rc = (stmt); \
   if (!SUCCESS(rc)) { \
      _tprintf(_T(#stmt) _T(" failed with rc = %ld\r\n"), rc); \
      goto EXIT; \
   } \
};

void PrintError(SQLSMALLINT HandleType, SQLHANDLE Handle) {
   RETCODE rc = SQL_SUCCESS;
   SQLTCHAR szSqlState[6];
   SQLTCHAR szMessage[1024];
   SQLSMALLINT i = 1;
   SQLSMALLINT msgLen = 0;
   SQLINTEGER NativeError;

   i = 1;
   while ( (rc = SQLGetDiagRec(HandleType, Handle, i, szSqlState, &NativeError, szMessage, sizeof(szMessage)/sizeof(SQLTCHAR), &msgLen)) != SQL_NO_DATA) {
      if (!SUCCESS(rc))
         break;
      szMessage[msgLen] = 0;
      szSqlState[5] = 0;
      _tprintf(_T("SQLState=%s, NativeError=%ld, Message=%s\r\n"), szSqlState, NativeError, szMessage);
      i++;
   }
}

int main() {
   RETCODE rc = SQL_SUCCESS;
   HENV henv = SQL_NULL_HENV;
   HDBC hdbc = SQL_NULL_HDBC;
   SQLHSTMT hstmt = SQL_NULL_HSTMT;
   SQLTCHAR * pszConnection = _T("DRIVER={SQL Server Native Client 10.0};Server=MyServer;Trusted_Connection=Yes;");

   // insert one TVP parameter
   SQLTCHAR * pszInsertStmt = _T("{call MCLOGInsert(?)}");
   SQLLEN cbParamLength;
   SQLULEN cMaxRows = 9;

   CHKRC(SQLAllocHandle(SQL_HANDLE_ENV, SQL_NULL_HENV, &henv));
   CHKRC(SQLSetEnvAttr(henv, SQL_ATTR_ODBC_VERSION, (SQLPOINTER)SQL_OV_ODBC3, 0));

   CHKRC(SQLAllocHandle(SQL_HANDLE_DBC, henv, &hdbc));
   CHKRC(SQLSetConnectAttr( hdbc, SQL_ATTR_LOGIN_TIMEOUT, reinterpret_cast<SQLPOINTER>(60), SQL_IS_UINTEGER));
   CHKRC(SQLDriverConnect( hdbc, NULL, pszConnection, SQL_NTS, NULL, 0, NULL, SQL_DRIVER_NOPROMPT)); 
   CHKRC(SQLAllocHandle(SQL_HANDLE_STMT, hdbc, &hstmt));
   CHKRC(SQLPrepare(hstmt, pszInsertStmt, SQL_NTS));

   // Bind the first parameter
   CHKRC(SQLBindParameter( hstmt, 1, SQL_PARAM_INPUT, SQL_C_DEFAULT, SQL_SS_TABLE, cMaxRows, 0, (SQLPOINTER)1, 0, &cbParamLength));

   /*
   // If the stored procedure is executed as T-SQL ("exec sp_insert ?, ?"), then, supply the type name.
   CHKRC(SQLBindParameter(hstmt, 1, SQL_PARAM_INPUT, SQL_C_DEFAULT, SQL_SS_TABLE, cMaxRows, 0, (SQLPOINTER)lpszTVPParamType, SQL_NTS, &cbParamLengths));
   */

   // bind TVP columns.
   CHKRC(SQLSetStmtAttr( hstmt, SQL_SOPT_SS_PARAM_FOCUS, (SQLPOINTER)1, SQL_IS_INTEGER)); 

   // For the first and the second TVP columns (bigint, int), always send them as bound. 
   // For the third column varbinary(max), either send them as bound or DAE.
   const size_t ARRAY_SIZE = 3;
   LONGLONG llSeqNo[ARRAY_SIZE];
   SQLLEN cbSeqNo[ARRAY_SIZE] = {sizeof(LONGLONG), sizeof(LONGLONG), sizeof(LONGLONG)};
   LONG lSeries[ARRAY_SIZE];
   SQLLEN cbSeries[ARRAY_SIZE] = {sizeof(LONG), sizeof(LONG), sizeof(LONG)};
   BYTE rgbRestData[ARRAY_SIZE][2048];
   SQLLEN cbRestData[ARRAY_SIZE] = {sizeof(rgbRestData[0]), sizeof(rgbRestData[0]), sizeof(rgbRestData[0])};
   SQLUSMALLINT iColumn = 1;

   // Bind biSeqNo 
   CHKRC(SQLBindParameter( hstmt, iColumn, SQL_PARAM_INPUT, SQL_C_SBIGINT, SQL_BIGINT, sizeof(LONGLONG), 0, (SQLPOINTER)&llSeqNo, sizeof(llSeqNo[0]), cbSeqNo));

   // Bind iSeries 
   iColumn++;
   CHKRC(SQLBindParameter( hstmt, iColumn, SQL_PARAM_INPUT, SQL_C_SLONG, SQL_INTEGER, sizeof(LONG), 0, (SQLPOINTER)&lSeries, sizeof(lSeries[0]), cbSeries));

   // Bind bmRestData 
   iColumn++;
   CHKRC(SQLBindParameter(hstmt, iColumn, SQL_PARAM_INPUT, SQL_C_BINARY, SQL_VARBINARY, 0, 0, (SQLPOINTER)rgbRestData, sizeof(rgbRestData[0]), cbRestData));

   CHKRC(SQLSetStmtAttr(hstmt, SQL_SOPT_SS_PARAM_FOCUS, (SQLPOINTER)0, SQL_IS_INTEGER));

   // Set cbParamLength to SQL_DATA_AT_EXEC to indicate the TVP parameter is bound as DAE.
   cbParamLength = SQL_DATA_AT_EXEC;
   rc = SQLExecute(hstmt);

   if (rc == SQL_NEED_DATA) {
      SQLPOINTER ptr = NULL;
      SQLUINTEGER cRows = 0;

      rc = ::SQLParamData(hstmt, &ptr);

      while (rc == SQL_NEED_DATA) {
         if (ptr == (SQLPOINTER)1) {
            // it is the TVP parameter
            if (cRows >= cMaxRows) {
               // We finish sending the last row already.
               CHKRC(::SQLPutData(hstmt, NULL, 0));
            }
            else {
               // Obtaining row data from somewhere. In this case we will fill 3 rows.
               for (size_t i = 0; i < ARRAY_SIZE; i++) {
                  llSeqNo[i] = cRows + i + 1;
                  lSeries[i] = llSeqNo[i] * 10;

                  // Now fill the varbinary(max) column.  Assume that the even row can't be fit into 
                  // the buffer provided as send them as DAE.
                  if (!((cRows + i) % 2)) {
                     // SQL_DATA_AT_EXEC means send DAE data.
                     cbRestData[i] = SQL_DATA_AT_EXEC;
                  }
                  else {
                     // data can fit into the buffer, then copy the data to the buffer directly.
                     cbRestData[i] = 100;
                     ::memset(&rgbRestData[i], 'b', cbRestData[i]);
                  }
               }
               CHKRC(::SQLPutData(hstmt, (SQLPOINTER)1, ARRAY_SIZE));
               cRows += ARRAY_SIZE;
            }
         }
         else if ((SQLPOINTER)&rgbRestData[0] <= ptr && ptr <= (SQLPOINTER)&rgbRestData[ARRAY_SIZE-1]) {
            // it is varbinary(max) column
            // Send data in parts.
            for (int i = 0; i < 3; i++) {
               // Obtain the data in part from somewhere, here we just set all bytes to 'a'.
               ::memset(ptr, 'a', sizeof(rgbRestData[0]));
               CHKRC(::SQLPutData(hstmt, (SQLPOINTER)ptr, sizeof(rgbRestData[0])));
            }
         }
         else {
            // handling other DAE parameters, but in our case, we don't have other DAE parameters.
            goto EXIT;
         }
         rc = ::SQLParamData(hstmt, &ptr);
      }
   }

EXIT:
   if (!SUCCESS(rc)) {
      if (hstmt) 
         PrintError(SQL_HANDLE_STMT, hstmt);
      if (hdbc)
         PrintError(SQL_HANDLE_DBC, hdbc);
      if(henv)
         PrintError(SQL_HANDLE_ENV, henv);
   }

   if (hstmt)
      SQLFreeHandle(SQL_HANDLE_STMT, hstmt);
   if (hdbc) {
      SQLDisconnect(hdbc);
      SQLFreeHandle(SQL_HANDLE_DBC, hdbc);
   }
   if (henv)
      SQLFreeHandle(SQL_HANDLE_ENV, henv);
}

请参阅

概念

ODBC 表值参数编程示例

通过

使用执行时数据将数据作为表值参数发送 (ODBC)

前提条件

发送数据

示例

说明

代码

示例

说明

代码

请参阅

概念

其他资源