本次将完成LONG类型字段的简单INSERT操作。
一、本次目标
向表CAT_1中插入一行数据(1,‘AAA...(共计5000个A)...AAA’)
附:
建表语句:CREATE TABLE CAT_1 (ID NUMBER, CATNAME LONG);
(建表程序参见:Oracle数据库LONG类型字段的完整C代码操作(CREATE INSERT SELECT DROP)之一--CREATE TABLE)
二、程序结构及重点说明
三、完整代码
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/*
OCI demo program for accessing LONG.
table
CAT_1 (ID NUMBER, CATNAME LONG);
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <oci.h>
#define DATA_SIZE 5000
typedef struct cdemol2lctx
{
OCIEnv *envhp;
OCIServer *srvhp;
OCISvcCtx *svchp;
OCIError *errhp;
OCISession *authp;
OCIStmt *stmthp;
} cdemol2lctx;
/*---------------------------------------------------------------------------
PRIVATE TYPES AND CONSTANTS
---------------------------------------------------------------------------*/
static text *username = (text *) "c##fang";
static text *password = (text *) "fang";
/*---------------------------------------------------------------------------
STATIC FUNCTION DECLARATIONS
---------------------------------------------------------------------------*/
static void initialize(cdemol2lctx *ctxptr);
static void cleanup(cdemol2lctx *ctxptr);
static void checkerr(/*_ OCIError *errhp, sword status _*/);
static void sql_stmt_execute(/*_ cdemol2lctx *ctxptx, text *sql_stmt _*/);
static void sql_exec_insert(/*_ cdemol2lctx *ctxptx _*/);
int main(/*_ int argc, char *argv[] _*/);
int main(argc, argv)
int argc;
char *argv[];
{
cdemol2lctx ctx;
printf("\n ######## start DEMO program ############ \n");
initialize(&ctx);
sql_exec_insert(&ctx); /*simple insert using LONG api*/
/* clean things up before exhit */
cleanup(&ctx);
return 1;
} /*end main*/
/*execute a single SQL statement */
void sql_stmt_execute(ctxptr, sql_stmt)
cdemol2lctx *ctxptr;
text *sql_stmt;
{
checkerr(ctxptr->errhp, OCIStmtPrepare(ctxptr->stmthp, ctxptr->errhp,
sql_stmt, (ub4) strlen((char *)sql_stmt),
(ub4) OCI_NTV_SYNTAX, (ub4) OCI_DEFAULT));
checkerr(ctxptr->errhp, OCIStmtExecute(ctxptr->svchp,
ctxptr->stmthp,
ctxptr->errhp, (ub4) 1, (ub4)0,
(OCISnapshot *) NULL, (OCISnapshot *) NULL,
OCI_DEFAULT));
} /* end of sql_stmt_execute() */
/*perform simple insert using LONG API*/
void sql_exec_insert(ctxptr)
cdemol2lctx *ctxptr;
{
text *ins_stmt1 = (text *)"INSERT INTO CAT_1 VALUES (:1, :2)";
OCIBind *bndp1 = (OCIBind *) NULL;
OCIBind *bndp2 = (OCIBind *) NULL;
sword id= 1, i;
char col2[DATA_SIZE];
ub2 col2len = DATA_SIZE;
for(i = 0; i < DATA_SIZE; i++) {
col2[i] = 'A';
}
checkerr(ctxptr->errhp, OCIStmtPrepare(ctxptr->stmthp, ctxptr->errhp,
ins_stmt1, (ub4) strlen((char *)ins_stmt1),
(ub4) OCI_NTV_SYNTAX, (ub4) OCI_DEFAULT));
printf("\nBEGINING SIMPLE INSERT INTO CAT_1... \n");
checkerr(ctxptr->errhp, OCIBindByPos(ctxptr->stmthp, &bndp1,
ctxptr->errhp, (ub4) 1,
(dvoid *) &id, (sb4) sizeof(id), SQLT_INT,
(dvoid *) 0, (ub2 *)0, (ub2 *)0,
(ub4) 0, (ub4 *) 0, (ub4) OCI_DEFAULT));
checkerr(ctxptr->errhp, OCIBindByPos(ctxptr->stmthp, &bndp2,
ctxptr->errhp, (ub4) 2,
(dvoid *) col2, (sb4) col2len, SQLT_CHR,
(dvoid *) 0, (ub2 *)0, (ub2 *)0,
(ub4) 0, (ub4 *) 0, (ub4) OCI_DEFAULT));
checkerr(ctxptr->errhp, OCIStmtExecute(ctxptr->svchp,
ctxptr->stmthp,
ctxptr->errhp, (ub4) 1, (ub4)0,
(OCISnapshot *) NULL, (OCISnapshot *) NULL,
OCI_DEFAULT));
} /* end sql_exe_insert() */
/*initialize envionment and handler*/
void initialize(ctxptr)
cdemol2lctx *ctxptr;
{
if (OCIEnvCreate((OCIEnv **) &ctxptr->envhp,
(ub4)OCI_THREADED|OCI_OBJECT, (dvoid *)0,
(dvoid * (*)(dvoid *, size_t)) 0,
(dvoid * (*)(dvoid *, dvoid *, size_t))0,
(void (*)(dvoid *, dvoid *)) 0,
(size_t) 0, (dvoid **) 0 ))
printf("FAILED: OCIEnvCreate()\n");
printf("\n ######## Connect to server ############# \n");
if (OCIHandleAlloc((dvoid *) ctxptr->envhp,
(dvoid **) &ctxptr->errhp,
(ub4) OCI_HTYPE_ERROR, (size_t) 0, (dvoid **) 0))
printf("FAILED: OCIHandleAlloc() on ctxptr->errhp\n");
if (OCIHandleAlloc((dvoid *) ctxptr->envhp,
(dvoid **) &ctxptr->srvhp,
(ub4) OCI_HTYPE_SERVER, (size_t) 0, (dvoid **) 0))
printf("FAILED: OCIHandleAlloc() on ctxptr->srvhp\n");
if (OCIHandleAlloc((dvoid *) ctxptr->envhp,
(dvoid **) &ctxptr->svchp,
(ub4) OCI_HTYPE_SVCCTX, (size_t) 0, (dvoid **) 0))
printf("FAILED: OCIHandleAlloc() on ctxptr->svchp\n");
if (OCIHandleAlloc((dvoid *) ctxptr->envhp,
(dvoid **) &ctxptr->authp,
(ub4) OCI_HTYPE_SESSION, (size_t) 0, (dvoid **) 0))
printf("FAILED: OCIHandleAlloc() on ctxptr->authp\n");
if (OCIServerAttach(ctxptr->srvhp, ctxptr->errhp,
(text *) "", (sb4) strlen((char *) ""),
(ub4) OCI_DEFAULT))
printf("FAILED: OCIServerAttach()\n");
if (OCIAttrSet((dvoid *) ctxptr->svchp, (ub4) OCI_HTYPE_SVCCTX,
(dvoid *) ctxptr->srvhp, (ub4) 0,
(ub4) OCI_ATTR_SERVER, ctxptr->errhp))
printf("FAILED: OCIAttrSet() server attribute\n");
/*begin log_on part */
if (OCIAttrSet((dvoid *) ctxptr->authp, (ub4) OCI_HTYPE_SESSION,
(dvoid *) username, (ub4) strlen((char *) username),
(ub4) OCI_ATTR_USERNAME, ctxptr->errhp))
printf("FAILED: OCIAttrSet() userid\n");
if (OCIAttrSet((dvoid *) ctxptr->authp, (ub4) OCI_HTYPE_SESSION,
(dvoid *) password, (ub4) strlen((char *) password),
(ub4) OCI_ATTR_PASSWORD, ctxptr->errhp))
printf("FAILED: OCIAttrSet() passwd\n");
printf("Logging on as %s ....\n", username);
checkerr(ctxptr->errhp, OCISessionBegin((dvoid *)ctxptr->svchp,
ctxptr->errhp, ctxptr->authp,
(ub4) OCI_CRED_RDBMS,(ub4) OCI_DEFAULT ));
printf("%s logged on.\n", username);
if (OCIAttrSet((dvoid *) ctxptr->svchp, (ub4) OCI_HTYPE_SVCCTX,
(dvoid *) ctxptr->authp, (ub4) 0, (ub4) OCI_ATTR_SESSION,
ctxptr->errhp))
printf("FAILED: OCIAttrSet() session\n");
/* end log_on part */
/* alocate stmt handle for sql queries */
if (OCIHandleAlloc((dvoid *)ctxptr->envhp, (dvoid **) &ctxptr->stmthp,
(ub4)OCI_HTYPE_STMT, (CONST size_t) 0, (dvoid **) 0))
printf("FAILED: alloc statement handle\n");
} /* end initialize() */
/*check status and print error information*/
void checkerr(errhp, status)
OCIError *errhp;
sword status;
{
text errbuf[512];
sb4 errcode = 0;
switch (status)
{
case OCI_SUCCESS:
break;
case OCI_SUCCESS_WITH_INFO:
(void) printf("Error - OCI_SUCCESS_WITH_INFO\n");
break;
case OCI_NEED_DATA:
(void) printf("Error - OCI_NEED_DATA\n");
break;
case OCI_NO_DATA:
(void) printf("Error - OCI_NODATA\n");
break;
case OCI_ERROR:
(void) OCIErrorGet((dvoid *)errhp, (ub4) 1, (text *) NULL, &errcode,
errbuf, (ub4) sizeof(errbuf), OCI_HTYPE_ERROR);
(void) printf("Error - %.*s\n", 512, errbuf);
break;
case OCI_INVALID_HANDLE:
(void) printf("Error - OCI_INVALID_HANDLE\n");
break;
case OCI_STILL_EXECUTING:
(void) printf("Error - OCI_STILL_EXECUTE\n");
break;
case OCI_CONTINUE:
(void) printf("Error - OCI_CONTINUE\n");
break;
default:
break;
}
} /* end checkerr() */
/*clean up envionment*/
void cleanup(ctxptr)
cdemol2lctx *ctxptr;
{
printf("\n ########## clean up ############ \n");
if (OCISessionEnd(ctxptr->svchp, ctxptr->errhp,
ctxptr->authp, (ub4) 0))
printf("FAILED: OCISessionEnd()\n");
printf("%s Logged off.\n", username);
if (OCIServerDetach(ctxptr->srvhp, ctxptr->errhp,
(ub4) OCI_DEFAULT))
printf("FAILED: OCIServerDetach()\n");
printf("Detached from server.\n");
printf("Freeing handles ...\n");
if (ctxptr->stmthp)
OCIHandleFree((dvoid *) ctxptr->stmthp, (ub4) OCI_HTYPE_STMT);
if (ctxptr->errhp)
OCIHandleFree((dvoid *) ctxptr->errhp, (ub4) OCI_HTYPE_ERROR);
if (ctxptr->srvhp)
OCIHandleFree((dvoid *) ctxptr->srvhp, (ub4) OCI_HTYPE_SERVER);
if (ctxptr->svchp)
OCIHandleFree((dvoid *) ctxptr->svchp, (ub4) OCI_HTYPE_SVCCTX);
if (ctxptr->authp)
OCIHandleFree((dvoid *) ctxptr->authp, (ub4) OCI_HTYPE_SESSION);
if (ctxptr->envhp)
OCIHandleFree((dvoid *) ctxptr->envhp, (ub4) OCI_HTYPE_ENV);
} /* end cleanup() */
/* end of file */
四、编译及运行
4.1 将long_simple_insert.c放入自己的目录下
4.2 编译
gcc long_simple_insert.c -o long_simple_insert -I $ORACLE_HOME/rdbms/public -L $ORACLE_HOME/lib -l clntsh
4.3 运行
./long_simple_insert
4.4 查看数据库中表的数据情况
select * from CAT_1;
(可见,上面显示,已经有一行数据成功插入了)
4.5上面数据怎么才80个A?!
莫慌,这不是你的问题,是Oracle显示的锅
起初看到这不够5000个A,我也很慌,查了资料,发现,Oracle这个对话框,默认显示80个字符,所以多的就显示不下了(Oracle也真是偷懒啊... ...)
(更多博文,欢迎来我的博客学习交流have_a_cat的博客_CSDN博客-PHP,Dcat-Admin框架,大厂热门笔试面试领域博主)
附带3个根本不好用的命令(执行后依旧只显示80个字符)
set line 10000;
set linesize 10000;
column CATNAME format a100;
有哪位高人会解决这个,望留言指点啊
五、可下载的代码包(懒人福音)
可通过下面的链接,免费下载有猫彬为你准备的代码包(已编译好,可直接运行,内含编译运行命令,直接复制粘贴即可)
https://download.csdn.net/download/have_a_cat/75369078https://download.csdn.net/download/have_a_cat/75369078