/*
cu1.c
gcc -o test -I/home/oracle/include -L/home/oracle/lib -lclntsh cu1.c -D_DEBUG -Wall -g
oracle的库文件和头文件路径根据个人电脑设置调整即可
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <oci.h>
typedef struct {
OCIEnv *EnvHP; //OCI环境句柄
OCIServer *SrvHP; //OCI服务器句柄
OCISvcCtx *SvcHP; //OCI服务器上下文句柄
OCIError *ErrHP; //OCI错误句柄
OCISession *SessionHP; //OCI对话句柄
OCIStmt *StmtHP; //OCI语句句柄
} MY_OCI_CONTEXT_T;
int oci_init(MY_OCI_CONTEXT_T* ociCtx_p);
static int select_data(MY_OCI_CONTEXT_T* ociCtx_p,int pid);
void oci_clean(MY_OCI_CONTEXT_T* ociCtx_p);
//tns名
char* pConnectChar = "tnsname";
//用户名和密码
char* pUsernameChar = "username";
char* pPasswordChar = "password";
int main()
{
int i;
int errNo = 0;
text errInfo[1024];
MY_OCI_CONTEXT_T ociCtx;
i = oci_init(&ociCtx); //初始化链接
printf("i = %d\n",i);
select_data(&ociCtx,1110); //执行sql语句
if( i == 1 )
{
oci_clean(&ociCtx);
}
else
{
(void)OCIErrorGet ((dvoid*) ociCtx.ErrHP, (ub4) 1, (text *) NULL, &errNo,
errInfo, (ub4)sizeof(errInfo)-1, (ub4) OCI_HTYPE_ERROR);
printf("ErroNO=%d\nerrInfor=%s\n", errNo, errInfo);
}
return 0;
}
int oci_init(MY_OCI_CONTEXT_T* ociCtx_p)
{
sword sr;
//OCI环境初始化 在8i以后，可用OCIEnvCreate一个函数就可以初始化环境了，相当于OCIInitialize+ OCIEnvInit
sr=OCIEnvInit( (OCIEnv **) &ociCtx_p->EnvHP, OCI_DEFAULT, (size_t) 0,
(dvoid **) 0 );
//创建OCI环境
sr=OCIEnvCreate(&ociCtx_p->EnvHP,OCI_DEFAULT,0,0,0,0,0,0);
//判断是否成功
if(sr!=OCI_SUCCESS)
{
return -1;
}
//申请错误句柄ErrHP
sr= OCIHandleAlloc( (dvoid *) ociCtx_p->EnvHP, (dvoid **) &ociCtx_p->ErrHP, OCI_HTYPE_ERROR,
(size_t) 0, (dvoid **) 0); /* server contexts */
if(sr!=OCI_SUCCESS)
{
return -1;
}
//申请服务器句柄SrvHP
sr=OCIHandleAlloc( (dvoid *)ociCtx_p->EnvHP, (dvoid **) &ociCtx_p->SrvHP, OCI_HTYPE_SERVER,
(size_t) 0, (dvoid **) 0);
if(sr!=OCI_SUCCESS)
{
return -1;
}
//申请服务器上下文句柄SvcHP
sr=OCIHandleAlloc( (dvoid *)ociCtx_p->EnvHP, (dvoid **) &ociCtx_p->SvcHP, OCI_HTYPE_SVCCTX,
(size_t) 0, (dvoid **) 0);
if(sr!=OCI_SUCCESS)
{
return -1;
}
//多用户方式连接数据库服务器,设置链接的服务器名pConnectChar
sr= OCIServerAttach(ociCtx_p->SrvHP,ociCtx_p->ErrHP, (text *)pConnectChar,
strlen(pConnectChar), 0);
if(sr!=OCI_SUCCESS)
{
printf("connect erro!!!!!!!!!!!!\n");
return -1;
}
/* set attribute server context in the service context */
//设置SvcHP句柄属性为：OCI_HTYPE_SVCCTX
(void) OCIAttrSet( (dvoid *)ociCtx_p->SvcHP, OCI_HTYPE_SVCCTX, (dvoid *)ociCtx_p->SrvHP,
(ub4) 0, OCI_ATTR_SERVER, (OCIError *) ociCtx_p->ErrHP);
//申请对话句柄SessionHP
sr= OCIHandleAlloc((dvoid *)ociCtx_p->EnvHP, (dvoid **)&ociCtx_p->SessionHP,
(ub4) OCI_HTYPE_SESSION, (size_t) 0, (dvoid **) 0);
if(sr!=OCI_SUCCESS)
{
return -1;
}
//设置用户名pUsernameChar
(void) OCIAttrSet((dvoid *)ociCtx_p->SessionHP, (ub4) OCI_HTYPE_SESSION,
(dvoid *)pUsernameChar, (ub4) strlen((char *)pUsernameChar),
(ub4) OCI_ATTR_USERNAME, ociCtx_p->ErrHP);
//设置SessionHP句柄用户登录密码pPasswordChar
(void) OCIAttrSet((dvoid *)ociCtx_p->SessionHP, (ub4) OCI_HTYPE_SESSION,
(dvoid *) pPasswordChar, (ub4) strlen((char *)pPasswordChar),
(ub4) OCI_ATTR_PASSWORD, ociCtx_p->ErrHP);
//建立一个会话连接
sr=OCISessionBegin (ociCtx_p->SvcHP, ociCtx_p->ErrHP, ociCtx_p->SessionHP, OCI_CRED_RDBMS,
(ub4) OCI_DEFAULT);
if(sr!=OCI_SUCCESS)
{
return -1;
}
//设置SvcHP句柄属性为：OCI_HTYPE_SVCCTX
(void) OCIAttrSet((dvoid *)ociCtx_p->SvcHP, (ub4) OCI_HTYPE_SVCCTX,
(dvoid *)ociCtx_p->SessionHP, (ub4) 0,
(ub4) OCI_ATTR_SESSION, ociCtx_p->ErrHP);
//申请语句句柄StmtHP
sr=OCIHandleAlloc( (dvoid *)ociCtx_p->EnvHP, (dvoid **) &ociCtx_p->StmtHP,
OCI_HTYPE_STMT, (size_t) 0, (dvoid **) 0);
if(sr!=OCI_SUCCESS)
{
return -1;
}
printf("#############Connect db sccessfully!################\n");
return 1;
}
//查询数据函数 示例代码的sql语句有两列输出
static int select_data(MY_OCI_CONTEXT_T* ociCtx_p,int pid)
{
char sqlcmd[128]="";
sword retcode;
OCIDefine *defcolp[3];
sword indp[3];
int pointId = 1;
int pointId1 = 1;
char pointName[30];
char pointDesc[60];
//生成sql语句
// sprintf(sqlcmd,"select c_point_id,c_point_name,C_POINT_DESC from t_point where c_point_id=%d",pid);
strcpy(sqlcmd,"select * from T1");
//准备SQL语句
retcode = OCIStmtPrepare (ociCtx_p->StmtHP, ociCtx_p->ErrHP, (unsigned char *)sqlcmd,
(ub4)strlen((char *)sqlcmd),
(ub4) OCI_NTV_SYNTAX, (ub4) OCI_DEFAULT
);
if(retcode!=OCI_SUCCESS)
{
printf("error OCIStmtPrepare \n");
}
//sql语句有两列输出，有几列就定义几次
//定义输出变量0
retcode=OCIDefineByPos(ociCtx_p->StmtHP, &defcolp[0], ociCtx_p->ErrHP, (ub4)1, (dvoid *)&pointId,
(sb4)sizeof(int), SQLT_INT , (dvoid *)&indp[0], (ub2 *)0,
(ub2 *)0, (ub4) OCI_DEFAULT);
if(retcode!=OCI_SUCCESS)
{
printf("error OCIDefineByPos 0 \n");
}
//定义输出变量1
retcode=OCIDefineByPos(ociCtx_p->StmtHP, &defcolp[0], ociCtx_p->ErrHP, (ub4)2, (dvoid *)&pointId1,
(sb4)sizeof(int), SQLT_INT , (dvoid *)&indp[1], (ub2 *)0,
(ub2 *)0, (ub4) OCI_DEFAULT);
if(retcode!=OCI_SUCCESS)
{
printf("error OCIDefineByPos 1 \n");
}
pointName[29] = '\0';
//执行SQL语句
retcode=OCIStmtExecute(ociCtx_p->SvcHP, ociCtx_p->StmtHP, ociCtx_p->ErrHP, (ub4) 1, (ub4) 0,
(CONST OCISnapshot *) NULL, (OCISnapshot *) NULL, OCI_DEFAULT );
//查错
if(retcode!=OCI_SUCCESS&&retcode!=OCI_NO_DATA)
{
int errNo = 0;
retcode = OCIErrorGet ((dvoid*) ociCtx_p->ErrHP, (ub4) 1, (text *) NULL, &errNo,
(text*)pointName, (ub4)sizeof(pointName)-1, (ub4) OCI_HTYPE_ERROR);
printf("error OCIStmtExecute No=%d Info=%s \n", errNo, pointName);
return -1;
}
//依次读取数据
printf("第一列=%d\t第二列=%d\n",pointId, pointId1);
while( OCIStmtFetch(ociCtx_p->StmtHP, ociCtx_p->ErrHP, (ub4)1, (ub4)OCI_FETCH_NEXT, (ub4)OCI_DEFAULT) != OCI_NO_DATA )
{
printf("第一列=%d\t第二列=%d\n",pointId, pointId1);
}
return 1;
}
void oci_clean(MY_OCI_CONTEXT_T* ociCtx_p)
{
printf("\n ########## clean up ############ \n");
//结束于数据库服务器的对话
if (OCISessionEnd(ociCtx_p->SvcHP, ociCtx_p->ErrHP,
ociCtx_p->SessionHP, (ub4) 0))
printf("FAILED: OCISessionEnd()\n");
//断开与数据库服务器链接
if (OCIServerDetach(ociCtx_p->SrvHP, ociCtx_p->ErrHP, (ub4) OCI_DEFAULT))
printf("FAILED: OCIServerDetach()\n");
printf("Detached from server.\n");
printf("Freeing handles ...\n");
if (ociCtx_p->StmtHP)
OCIHandleFree((dvoid *) ociCtx_p->StmtHP, (ub4) OCI_HTYPE_STMT);
if (ociCtx_p->ErrHP)
OCIHandleFree((dvoid *) ociCtx_p->ErrHP, (ub4) OCI_HTYPE_ERROR);
if (ociCtx_p->SrvHP)
OCIHandleFree((dvoid *) ociCtx_p->SrvHP, (ub4) OCI_HTYPE_SERVER);
if (ociCtx_p->SvcHP)
OCIHandleFree((dvoid *) ociCtx_p->SvcHP, (ub4) OCI_HTYPE_SVCCTX);
if (ociCtx_p->SessionHP)
OCIHandleFree((dvoid *) ociCtx_p->SessionHP, (ub4) OCI_HTYPE_SESSION);
if (ociCtx_p->EnvHP)
OCIHandleFree((dvoid *) ociCtx_p->EnvHP, (ub4) OCI_HTYPE_ENV);
}
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