AIX下Oracle数据库访问助你走向成功（aix访问oracle）

X下Oracle数据库访问助你走向成功

在现今信息化的时代，数据库无疑是所有企业的重要基础设施之一，而Oracle数据库更成为了数据库市场中的领头羊。而在X操作系统下，如何访问Oracle数据库呢？本篇文章将为大家介绍X下Oracle数据库访问的关键点，并提供相应的代码示例，助你走向成功。

一、安装Oracle即客户端

在X操作系统中，我们需要先安装Oracle客户端，以便能够访问Oracle数据库。通常情况下，我们可以使用Oracle Instant Client这一轻量级的客户端，安装步骤如下：

1. 下载对应版本的Oracle Instant Client，解压到指定目录。

2. 为Oracle Instant Client创建软链接：

ln -s libocci.so.11.1 libocci.so

ln -s libclntsh.so.11.1 libclntsh.so

3. 修改环境变量，将Oracle Instant Client所在目录加入到环境变量LD_LIBRARY_PATH中：

export LD_LIBRARY_PATH=/path/to/instantclient:$LD_LIBRARY_PATH

二、连接Oracle数据库

连接Oracle数据库的方法有很多，其中最常用的是使用OCI方法进行连接。OCI（Oracle Call Interface）是Oracle提供的一套C语言接口，可以用于开发应用程序，并且支持多线程和多个客户端连接。以下是连接Oracle数据库的完整示例代码：

“`c

#include

#include

#include

int mn()

{

OCIEnv * envhp;

OCIError * errhp;

OCIStmt * stmthp;

OCIServer * srvhp;

OCISession * sesnhp;

OCIString * str;

OCISvcCtx * svcCtx;

char * host = “127.0.0.1”; // Oracle服务器IP

char * user = “scott”; // Oracle用户名

char * password = “tiger”; // Oracle密码

char * dbname = “orcl”; // Oracle数据库名

// 初始化OCI环境

if (OCIEnvCreate(&envhp, OCI_DEFAULT, NULL, NULL, NULL, NULL, 0, NULL)) {

printf(“OCIEnvCreate() fled\n”);

return -1;

}

// 创建OCI Error handle

if (OCIHandleAlloc(envhp, (void**)&errhp, OCI_HTYPE_ERROR, 0, NULL)) {

printf(“OCIHandleAlloc() fled\n”);

return -1;

}

// 创建OCI Server handle

if (OCIHandleAlloc(envhp, (void**)&srvhp, OCI_HTYPE_SERVER, 0, NULL)) {

printf(“OCIHandleAlloc() fled\n”);

return -1;

}

// 创建OCI Service handle

if (OCIHandleAlloc(envhp, (void**)&svcCtx, OCI_HTYPE_SVCCTX, 0, NULL)) {

printf(“OCIHandleAlloc() fled\n”);

return -1;

}

// 创建OCI String

if (OCIHandleAlloc(envhp, (void**)&str, OCI_HTYPE_STRING, 0, NULL)) {

printf(“OCIHandleAlloc() fled\n”);

return -1;

}

// 设置OCI Server handle属性

if (OCIServerAttach(srvhp, errhp, (const OraText*)dbname, strlen(dbname), OCI_DEFAULT)) {

printf(“OCIServerAttach() fled\n”);

return -1;

}

// 设置OCI Service handle属性

if (OCIAttrSet((void*)svcCtx, OCI_HTYPE_SVCCTX, (void*)srvhp, (ub4)0, OCI_ATTR_SERVER, errhp)) {

printf(“OCIAttrSet() fled\n”);

return -1;

}

// 创建OCI Session handle

if (OCIHandleAlloc(envhp, (void**)&sesnhp, OCI_HTYPE_SESSION, 0, NULL)) {

printf(“OCIHandleAlloc() fled\n”);

return -1;

}

// 设置OCI Session handle属性

if (OCIAttrSet((void*)sesnhp, OCI_HTYPE_SESSION, (void*)user, (ub4)strlen(user), OCI_ATTR_USERNAME, errhp)) {

printf(“OCIAttrSet() fled\n”);

return -1;

}

if (OCIAttrSet((void*)sesnhp, OCI_HTYPE_SESSION, (void*)password, (ub4)strlen(password), OCI_ATTR_PASSWORD, errhp)) {

printf(“OCIAttrSet() fled\n”);

return -1;

}

// 建立OCI Session连接

if (OCISessionBegin(svcCtx, errhp, sesnhp, OCI_CRED_RDBMS, OCI_DEFAULT)) {

printf(“OCISessionBegin() fled\n”);

return -1;

}

// 设置OCI Service handle属性

if (OCIAttrSet((void*)svcCtx, OCI_HTYPE_SVCCTX, (void*)sesnhp, (ub4)0, OCI_ATTR_SESSION, errhp)) {

printf(“OCIAttrSet() fled\n”);

return -1;

}

// 创建OCI Statement handle

if (OCIHandleAlloc(envhp, (void**)&stmthp, OCI_HTYPE_STMT, 0, NULL)) {

printf(“OCIHandleAlloc() fled\n”);

return -1;

}

// 执行SQL语句

if (OCIStmtPrepare(stmthp, errhp, (const OraText*)”SELECT * FROM emp”, strlen(“SELECT * FROM emp”), OCI_NTV_SYNTAX, OCI_DEFAULT)) {

printf(“OCIStmtPrepare() fled\n”);

return -1;

}

if (OCIStmtExecute(svcCtx, stmthp, errhp, 0, 0, NULL, NULL, OCI_DEFAULT)) {

printf(“OCIStmtExecute() fled\n”);

return -1;

}

// 解析SQL语句

OCIParam * param;

char * colval;

ub4 colsize;

ub2 coltype;

ub4 colind;

ub4 ncol;

OCIDefine *defhp;

if (OCIStmtExecute(svcCtx, stmthp, errhp, 0, 0, NULL, NULL, OCI_DESCRIBE_ONLY)) {

printf(“OCIStmtExecute() fled\n”);

return -1;

}

if (OCIAttrGet((dvoid *) stmthp, OCI_HTYPE_STMT, (dvoid *)&ncol, NULL, OCI_ATTR_PARAM_COUNT, errhp)) {

printf(“OCIAttrGet() fled\n”);

return -1;

}

for (int i = 1; i

if (OCIParamGet(stmthp, OCI_HTYPE_STMT, errhp, (dvoid **)&param, i)) {

printf(“OCIParamGet() fled\n”);

return -1;

}

if (OCIAttrGet(param, OCI_DTYPE_PARAM, (dvoid *)&colval, (ub4 *)&colsize, OCI_ATTR_NAME, errhp)) {

printf(“OCIAttrGet() fled\n”);

return -1;

}

printf(“%s\t”, colval);

if (OCIAttrGet(param, OCI_DTYPE_PARAM, (dvoid *)&coltype, NULL, OCI_ATTR_DATA_TYPE, errhp)) {

printf(“OCIAttrGet() fled\n”);

return -1;

}

if (OCIAttrGet(param, OCI_DTYPE_PARAM, (dvoid *)&colsize, NULL, OCI_ATTR_DATA_SIZE, errhp)) {

printf(“OCIAttrGet() fled\n”);

return -1;

}

if (OCIAttrGet(param, OCI_DTYPE_PARAM, (dvoid *)&colind, NULL, OCI_ATTR_DATA_LENGTH, errhp)) {

printf(“OCIAttrGet() fled\n”);

return -1;

}

if (OCIAttrSet(stmthp, OCI_HTYPE_STMT, (void*)&defhp, (ub4)sizeof(defhp), OCI_ATTR_DEFHP, errhp)) {

printf(“OCIAttrSet() fled\n”);

return -1;

}

void *data = (void*) malloc(colsize);

if (OCIAttrSet(defhp, OCI_HTYPE_DEFINE, data, colsize, OCI_ATTR_DATA_PTR, errhp)) {

printf(“OCIAttrSet() fled\n”);

return -1;

}

if (OCIAttrSet(defhp, OCI_HTYPE_DEFINE, (void *)&colind, (ub4)sizeof(colind), OCI_ATTR_INDICATOR, errhp)){

printf(“OCIAttrSet() fled\n”);

return -1;

}

switch (coltype) {

case SQLT_CHR:

if (OCIStmtBindByName(stmthp, &defhp, errhp, (const OraText *)colval, strlen(colval),

(void*)data, colsize, SQLT_STR, 0, NULL, NULL, 0, NULL