深入探索C语言操作Oracle的插入语句(c oracle插入语句)
深入探索C语言操作Oracle的插入语句
Oracle是一种流行的数据库管理系统,广泛应用于企业级应用开发中。在C语言中,我们可以使用OCI(Oracle Call Interface)来连接Oracle数据库并进行数据交互操作。本篇文章将深入探讨如何使用C语言操作Oracle的插入语句。
1. 准备工作
在进行操作之前,我们需要对环境进行一些准备工作。首先需要安装Oracle客户端,并正确配置环境变量。需要下载OCI的头文件,并将其包含在项目中。需要连接到Oracle数据库并获取一个数据库连接句柄,以便在代码中使用。
2. 插入数据操作
在C语言中,通过OCI接口,我们可以使用OCIStmtPrepare()函数准备一个SQL语句,并使用OCIStmtExecute()函数执行该语句。下面是一个使用C语言向Oracle数据库中插入数据的示例代码:
#include
#include
#include
int mn(int argc, char **argv){
OCIEnv *envhp; OCIError *errhp;
OCISvcCtx *svchp; OCISession *authp;
OCIServer *srvhp; OCIDefine *defhp;
OCIStmt *stmthp; sword status;
char *sql = "insert into user_info(name, age, sex) values(:1, :2, :3)"; char *user = "username";
char *passwd = "password"; char *db = "dbname";
char *host = "hostname";
int name_len = strlen("test"); char name[20] = "test";
int age = 20; int sex = 0;
OCIInitialize(OCI_DEFAULT, NULL, NULL, NULL, NULL); OCIEnvInit(&envhp, OCI_DEFAULT, NULL, NULL);
OCIHandleAlloc((dvoid *) envhp, (dvoid **) &errhp, OCI_HTYPE_ERROR, 0, NULL);
OCIHandleAlloc((dvoid *) envhp, (dvoid **) &srvhp, OCI_HTYPE_SERVER, 0, NULL); OCIServerAttach(srvhp, errhp, (text *) db, strlen(db), OCI_DEFAULT);
OCIHandleAlloc((dvoid *) envhp, (dvoid **) &svchp, OCI_HTYPE_SVCCTX, 0, NULL); OCIAttrSet((dvoid *) svchp, OCI_HTYPE_SVCCTX, (dvoid *) srvhp, (ub4) 0, OCI_ATTR_SERVER, errhp);
OCIHandleAlloc((dvoid *) envhp, (dvoid **) &authp, OCI_HTYPE_SESSION, 0, NULL); OCIAttrSet((dvoid *) authp, OCI_HTYPE_SESSION, (dvoid *) user, (ub4) strlen(user), OCI_ATTR_USERNAME, errhp);
OCIAttrSet((dvoid *) authp, OCI_HTYPE_SESSION, (dvoid *) passwd, (ub4) strlen(passwd), OCI_ATTR_PASSWORD, errhp); status = OCISessionBegin(svchp, errhp, authp, OCI_CRED_RDBMS, OCI_DEFAULT);
OCIAttrSet((dvoid *) svchp, OCI_HTYPE_SVCCTX, (dvoid *) authp, (ub4) 0, OCI_ATTR_SESSION, errhp);
OCIHandleAlloc((dvoid *) envhp, (dvoid **) &stmthp, OCI_HTYPE_STMT, 0, NULL); OCIStmtPrepare(stmthp, errhp, (text *) sql, strlen(sql), OCI_NTV_SYNTAX, OCI_DEFAULT);
OCIStmtBindByName(stmthp, &defhp, errhp, (text *) ":1", strlen(":1"), (dvoid *) name, name_len+1, SQLT_STR, NULL, NULL, NULL, 0, NULL, OCI_DEFAULT); OCIStmtBindByName(stmthp, &defhp, errhp, (text *) ":2", strlen(":2"), (dvoid *) &age, sizeof(age), SQLT_INT, NULL, NULL, NULL, 0, NULL, OCI_DEFAULT);
OCIStmtBindByName(stmthp, &defhp, errhp, (text *) ":3", strlen(":3"), (dvoid *) &sex, sizeof(sex), SQLT_INT, NULL, NULL, NULL, 0, NULL, OCI_DEFAULT);
status = OCIStmtExecute(svchp, stmthp, errhp, 1, 0, NULL, NULL, OCI_COMMIT_ON_SUCCESS); if(status != OCI_SUCCESS)
{ printf("Insert fled\n");
} else
{ printf("Insert succeeded\n");
}
OCIStmtFree(stmthp, OCI_DEFAULT); OCISessionEnd(svchp, errhp, authp, OCI_DEFAULT);
OCIServerDetach(srvhp, errhp, OCI_DEFAULT); OCIHandleFree((dvoid *) authp, OCI_HTYPE_SESSION);
OCIHandleFree((dvoid *) svchp, OCI_HTYPE_SVCCTX); OCIHandleFree((dvoid *) srvhp, OCI_HTYPE_SERVER);
OCIHandleFree((dvoid *) errhp, OCI_HTYPE_ERROR); OCIHandleFree((dvoid *) envhp, OCI_HTYPE_ENV);
return 0;}
3. 结束语
本文介绍了如何使用C语言操作Oracle的插入语句。这仅仅是C语言操作Oracle的一小部分,通过对OCI的深入了解,我们可以在C语言中实现更丰富的Oracle数据库操作。