/*
Author:o00231432
测试odbc支持nvarchar2类型
test: odbc支持创建表，字段名类型为nvarchar2;SQLGetData能取出nvarchar2数据类型的值
*/
#include <stdio.h>
#include <sql.h>
#include <sqlext.h>
#include <sqltypes.h>
#include <time.h>
SQLHENV       V_OD_Env;    // Handle ODBC environment
SQLHSTMT       V_OD_hstmt; 
long       V_OD_erg;    // result of functions
SQLHDBC       V_OD_hdbc;                      // Handle connection
char       V_OD_stat[10];    // Status SQL
SQLINTEGER     V_OD_err,V_OD_id,V_ID;
SQLSMALLINT     V_OD_mlen,V_OD_colanz;
char            V_OD_buffer[200],V_OD_msg[200],schema[200],table[200],type[200],remark[200],V_OD_buffer1[200];
char *buf = "Mike";
int value = 3;
SQLRETURN       rc;
SQLLEN  V_OD_rowanz;
int main(int argc,char *argv[])
{

  /**
	ODBC handle
	1) SQL_HANDLE_ENV 
	2) SQL_HANDLE_DBC
	3) SQL_HANDLE_STMT
  */
	
  // 1. allocate Environment handle and register version 
  V_OD_erg = SQLAllocHandle(SQL_HANDLE_ENV,SQL_NULL_HANDLE,&V_OD_Env);
  if ((V_OD_erg != SQL_SUCCESS) && (V_OD_erg != SQL_SUCCESS_WITH_INFO))
  {
    printf("Error AllocHandle\n");
    return -1;
  }
  V_OD_erg = SQLSetEnvAttr(V_OD_Env, SQL_ATTR_ODBC_VERSION, (void*)SQL_OV_ODBC3, 0); 
  if ((V_OD_erg != SQL_SUCCESS) && (V_OD_erg != SQL_SUCCESS_WITH_INFO))
  {
    printf("Error SetEnv\n");
    SQLFreeHandle(SQL_HANDLE_ENV, V_OD_Env);
    return -1;
  }
  
  // 2. allocate connection handle, set timeout
  V_OD_erg = SQLAllocHandle(SQL_HANDLE_DBC, V_OD_Env, &V_OD_hdbc); 
  if ((V_OD_erg != SQL_SUCCESS) && (V_OD_erg != SQL_SUCCESS_WITH_INFO))
  {
    printf("Error AllocHDB %d\n",V_OD_erg);
    SQLFreeHandle(SQL_HANDLE_ENV, V_OD_Env);
    return -1;
  }
  
  // 3. Connect to the datasource "web" 
  V_OD_erg = SQLConnect(V_OD_hdbc, (SQLCHAR*) "gaussdb", SQL_NTS,
                                     (SQLCHAR*) "", SQL_NTS,
                                     (SQLCHAR*) "", SQL_NTS);
  if ((V_OD_erg != SQL_SUCCESS) && (V_OD_erg != SQL_SUCCESS_WITH_INFO))
  {
    printf("Error SQLConnect %d\n",V_OD_erg);
    SQLGetDiagRec(SQL_HANDLE_DBC, V_OD_hdbc,1, 
                  V_OD_stat, &V_OD_err,V_OD_msg,100,&V_OD_mlen);
    printf("%s (%d)\n",V_OD_msg,V_OD_err);
    SQLFreeHandle(SQL_HANDLE_ENV, V_OD_Env);
    return -1;
  }
  printf("Connected Successfuly!\n");
  
  //4. allocate statement handle.
  V_OD_erg=SQLAllocHandle(SQL_HANDLE_STMT, V_OD_hdbc, &V_OD_hstmt);
  if ((V_OD_erg != SQL_SUCCESS) && (V_OD_erg != SQL_SUCCESS_WITH_INFO))
  {
    printf("Fehler im AllocStatement %d\n",V_OD_erg);
    SQLGetDiagRec(SQL_HANDLE_DBC, V_OD_hdbc,1, V_OD_stat,&V_OD_err,V_OD_msg,100,&V_OD_mlen);
    printf("%s (%d)\n",V_OD_msg,V_OD_err);
    SQLFreeHandle(SQL_HANDLE_ENV, V_OD_Env);
    return -1;
  }
  
	//SQLExecDirect
	V_OD_erg = SQLExecDirect(V_OD_hstmt,"drop table IF EXISTS odbc_nvarchar2_01",SQL_NTS);  
	if ((V_OD_erg != SQL_SUCCESS) && (V_OD_erg != SQL_SUCCESS_WITH_INFO))
    {
       printf("Error in drop %d\n",V_OD_erg);
       SQLGetDiagRec(SQL_HANDLE_DBC, V_OD_hdbc,1, V_OD_stat,&V_OD_err,V_OD_msg,100,&V_OD_mlen);
       printf("%s (%d)\n",V_OD_msg,V_OD_err);
       SQLFreeHandle(SQL_HANDLE_STMT,V_OD_hstmt);
       SQLFreeHandle(SQL_HANDLE_DBC,V_OD_hdbc);
       SQLFreeHandle(SQL_HANDLE_ENV, V_OD_Env);
       return -1;
    }	
	
	V_OD_erg = SQLExecDirect(V_OD_hstmt,"create table odbc_nvarchar2_01(name nvarchar2)",SQL_NTS);  
	if ((V_OD_erg != SQL_SUCCESS) && (V_OD_erg != SQL_SUCCESS_WITH_INFO))
    {
       printf("Error in create %d\n",V_OD_erg);
       SQLGetDiagRec(SQL_HANDLE_DBC, V_OD_hdbc,1, V_OD_stat,&V_OD_err,V_OD_msg,100,&V_OD_mlen);
       printf("%s (%d)\n",V_OD_msg,V_OD_err);
       SQLFreeHandle(SQL_HANDLE_STMT,V_OD_hstmt);
       SQLFreeHandle(SQL_HANDLE_DBC,V_OD_hdbc);
       SQLFreeHandle(SQL_HANDLE_ENV, V_OD_Env);
       return -1;
    }
    SQLExecDirect(V_OD_hstmt,"insert into odbc_nvarchar2_01 values('omom')",SQL_NTS);
	//插入多条记录
    SQLExecDirect(V_OD_hstmt,"insert into odbc_nvarchar2_01 values('anan'),('asjdlf'),('jsdl'),('allsl'),('lalls'),('sldf'),('sljdfl'),('oeiowri'),('sldjlaa'),('alsa')",SQL_NTS);	
	
	//查询结果
	V_OD_erg = SQLExecDirect(V_OD_hstmt,"SELECT name FROM odbc_nvarchar2_01 order by name",SQL_NTS);  
	//判断上次查询是否成功
    if ((V_OD_erg != SQL_SUCCESS) && (V_OD_erg != SQL_SUCCESS_WITH_INFO))
    {
       printf("Error in Select %d\n",V_OD_erg);
       SQLGetDiagRec(SQL_HANDLE_DBC, V_OD_hdbc,1, V_OD_stat,&V_OD_err,V_OD_msg,100,&V_OD_mlen);
       printf("%s (%d)\n",V_OD_msg,V_OD_err);
       SQLFreeHandle(SQL_HANDLE_STMT,V_OD_hstmt);
       SQLFreeHandle(SQL_HANDLE_DBC,V_OD_hdbc);
       SQLFreeHandle(SQL_HANDLE_ENV, V_OD_Env);
       return -1;
    }
	
	//SQLNumResultCols返回结果集中的列数
    V_OD_erg=SQLNumResultCols(V_OD_hstmt,&V_OD_colanz);
    if ((V_OD_erg != SQL_SUCCESS) && (V_OD_erg != SQL_SUCCESS_WITH_INFO))
    {
        SQLFreeHandle(SQL_HANDLE_STMT,V_OD_hstmt);
        SQLDisconnect(V_OD_hdbc);
        SQLFreeHandle(SQL_HANDLE_DBC,V_OD_hdbc);
        SQLFreeHandle(SQL_HANDLE_ENV, V_OD_Env);
       return -1;
    }
    printf("SQLNumResultCols ---- Number of Columns %d\n",V_OD_colanz);
	
	//SQLRowCount 返回结果集中的行数
    rc=SQLRowCount(V_OD_hstmt,&V_OD_rowanz);
    if ((!SQL_SUCCEEDED(rc)))
    {
      printf("Number of RowCount %d\n",rc);
      SQLFreeHandle(SQL_HANDLE_STMT,V_OD_hstmt);
      SQLDisconnect(V_OD_hdbc);
      SQLFreeHandle(SQL_HANDLE_DBC,V_OD_hdbc);
      SQLFreeHandle(SQL_HANDLE_ENV, V_OD_Env);
      return -1;
    }
    printf("SQLRowCount ----- Number of Rows %d\n",V_OD_rowanz);
	
    SQLBindCol(V_OD_hstmt,1,SQL_C_CHAR, (SQLPOINTER)&V_OD_buffer,150,(SQLLEN * )&V_OD_err);	
	
	//SQLFetch取出数据
    V_OD_erg=SQLFetch(V_OD_hstmt);  
    while(V_OD_erg != SQL_NO_DATA)
    {
	 SQLGetData(V_OD_hstmt,1,SQL_C_ULONG,(SQLPOINTER)&V_ID,0,(SQLLEN * )&V_OD_err);
	 printf("SQLGetData ----name = %s\n",V_OD_buffer);
     V_OD_erg=SQLFetch(V_OD_hstmt);  
    };

	
    SQLFreeHandle(SQL_HANDLE_STMT,V_OD_hstmt);
    SQLDisconnect(V_OD_hdbc);
    SQLFreeHandle(SQL_HANDLE_DBC,V_OD_hdbc);
    SQLFreeHandle(SQL_HANDLE_ENV, V_OD_Env);
    return(0);
}