C++代码  

1. #include <stdio.h>
   #include <string.h>
   #include <windows.h>
   #include <sql.h>
   #include <sqlext.h>
   #include <sqltypes.h>
   #include <odbcss.h>     SQLHENV henv = SQL_NULL_HENV;
   SQLHDBC hdbc1 = SQL_NULL_HDBC;
   SQLHSTMT hstmt1 = SQL_NULL_HSTMT;     /* cpp文件功能说明： 1.数据库操作中的添加，修改，删除，主要体现在SQL语句上 2.采用直接执行方式和参数预编译执行方式两种
   */
   int main(){     RETCODE retcode;     UCHAR   szDSN[SQL_MAX_DSN_LENGTH+1]   =   "csql",     szUID[MAXNAME]   =   "sa",     szAuthStr[MAXNAME]   =   "";    //SQL语句  //直接SQL语句  UCHAR   sql[37] = "insert into test values('aaa','100')";  //预编译SQL语句  UCHAR   pre_sql[29] = "insert into test values(?,?)";  //1.连接数据源  //1.环境句柄  retcode   =   SQLAllocHandle   (SQL_HANDLE_ENV,   NULL,   &henv);     retcode   =   SQLSetEnvAttr(henv,   SQL_ATTR_ODBC_VERSION,     (SQLPOINTER)SQL_OV_ODBC3,     SQL_IS_INTEGER);     //2.连接句柄    retcode   =   SQLAllocHandle(SQL_HANDLE_DBC,   henv,   &hdbc1);     retcode   =   SQLConnect(hdbc1,   szDSN,   4,   szUID,   2,   szAuthStr,   0);      //判断连接是否成功  if   (   (retcode   !=   SQL_SUCCESS)   &&   (retcode   !=   SQL_SUCCESS_WITH_INFO)   )   {       printf("连接失败!\n");  }   else   {     //2.创建并执行一条或多条SQL语句  /* 1.分配一个语句句柄(statement handle) 2.创建SQL语句 3.执行语句 4.销毁语句 */  retcode   =   SQLAllocHandle(SQL_HANDLE_STMT,   hdbc1,   &hstmt1);     //第一种方式  //直接执行  //添加操作  //SQLExecDirect (hstmt1,sql,37);  //第二种方式  //绑定参数方式  char a[200]="bbb";  char b[200]="200";  SQLINTEGER   p   =   SQL_NTS;  //1预编译  SQLPrepare(hstmt1,pre_sql,29); //第三个参数与数组大小相同，而不是数据库列相同  //2绑定参数值  SQLBindParameter(hstmt1,1,SQL_PARAM_INPUT,SQL_C_CHAR,SQL_CHAR,200,0,&a,0,&p);  SQLBindParameter(hstmt1,2,SQL_PARAM_INPUT,SQL_C_CHAR,SQL_CHAR,200,0,&b,0,&p);  //3 执行  SQLExecute(hstmt1);  printf("操作成功!");  //释放语句句柄  SQLCloseCursor (hstmt1);  SQLFreeHandle (SQL_HANDLE_STMT, hstmt1);  }     //3.断开数据源  /* 1.断开与数据源的连接. 2.释放连接句柄. 3.释放环境句柄 (如果不再需要在这个环境中作更多连接) */  SQLDisconnect(hdbc1);      SQLFreeHandle(SQL_HANDLE_DBC, hdbc1);     SQLFreeHandle(SQL_HANDLE_ENV, henv);     return(0);
   }   

#include <stdio.h>
#include <string.h>
#include <windows.h>
#include <sql.h>
#include <sqlext.h>
#include <sqltypes.h>
#include <odbcss.h>   SQLHENV henv = SQL_NULL_HENV;
SQLHDBC hdbc1 = SQL_NULL_HDBC;
SQLHSTMT hstmt1 = SQL_NULL_HSTMT;   /*查询SQLSERVER数据库,1.条件查询,2.直接查询全部
*/
int main(){   RETCODE retcode;   UCHAR   szDSN[SQL_MAX_DSN_LENGTH+1]   =   "csql",   szUID[MAXNAME]   =   "sa",   szAuthStr[MAXNAME]   =   "";  UCHAR sql1[39] = "select b from test where a = 'aaa'";UCHAR sql2[35] = "select b from test where a = ? ";UCHAR  sql3[19] = "select b from test";retcode   =   SQLAllocHandle   (SQL_HANDLE_ENV,   NULL,   &henv);   retcode   =   SQLSetEnvAttr(henv,   SQL_ATTR_ODBC_VERSION,   (SQLPOINTER)SQL_OV_ODBC3,   SQL_IS_INTEGER);    retcode   =   SQLAllocHandle(SQL_HANDLE_DBC,   henv,   &hdbc1);   //1.连接数据源retcode   =   SQLConnect(hdbc1,   szDSN,   4,   szUID,   2,   szAuthStr,   0);    if   (   (retcode   !=   SQL_SUCCESS)   &&   (retcode   !=   SQL_SUCCESS_WITH_INFO)   )   {   printf("连接失败!");}   else   {   //2.创建并执行一条或多条SQL语句/*1.分配一个语句句柄(statement handle)2.创建SQL语句3.执行语句4.销毁语句*/retcode   =   SQLAllocHandle(SQL_HANDLE_STMT,   hdbc1,   &hstmt1);   //第一种方式/*//直接执行SQLExecDirect (hstmt1,sql1,39);char list[5];SQLBindCol(hstmt1, 1, SQL_C_CHAR, list, 5, 0);SQLFetch(hstmt1);printf("%s\n",list);*///第二种方式/*//绑定参数方式char a[200]="aaa";SQLINTEGER   p   =   SQL_NTS;//1.预编译SQLPrepare(hstmt1,sql2,35); //第三个参数与数组大小相同，而不是数据库列相同//2.绑定参数值SQLBindParameter(hstmt1,1,SQL_PARAM_INPUT,SQL_C_CHAR,SQL_CHAR,200,0,&a,0,&p);//3.执行SQLExecute(hstmt1);char list[5];SQLBindCol(hstmt1, 1, SQL_C_CHAR, list, 5, 0);SQLFetch(hstmt1);printf("%s\n",list);*///第三种方式全部输出/*1.确认一个结果集是否可用。2.将结果集的列绑定在适当的变量上。3.取得行*///3.检查结果记录(如果有的话)SQLExecDirect (hstmt1,sql3,19);char list[5];SQLBindCol(hstmt1, 1, SQL_C_CHAR, list, 5, 0);do{retcode = SQLFetch(hstmt1);if(retcode == SQL_NO_DATA){break;}printf("%s\n",list);}while(1);//释放语句句柄SQLCloseCursor (hstmt1);SQLFreeHandle (SQL_HANDLE_STMT, hstmt1);}   //4.断开数据源/*1.断开与数据源的连接.2.释放连接句柄.3.释放环境句柄 (如果不再需要在这个环境中作更多连接)*/SQLDisconnect(hdbc1);    SQLFreeHandle(SQL_HANDLE_DBC, hdbc1);   SQLFreeHandle(SQL_HANDLE_ENV, henv);   return(0);
}