C语言实现快速oracle数据批量插入（c 批量插入oracle）

C语言实现快速Oracle数据批量插入

介绍

Oracle数据库是业界领先的关系型数据库之一，而C语言是一种广泛应用的高级编程语言。本文将介绍如何使用C语言实现快速的Oracle数据批量插入。

步骤

步骤1：创建数据库表格

我们需要在Oracle数据库中创建一个数据表格。下面是一个示例表格：

CREATE TABLE test (
  id   NUMBER PRIMARY KEY,
  name VARCHAR2(50)
);

步骤2：安装Oracle Instant Client

在C语言中，我们需要使用Oracle Instant Client来与Oracle数据库进行通信。因此，我们需要在本地机器上安装Oracle Instant Client。

步骤3：连接到Oracle数据库

使用C语言，我们需要连接到Oracle数据库。我们可以使用Oracle Instant Client提供的OCI库来实现。以下代码片段展示了如何连接到Oracle数据库：

OCIEnv* envhp;
OCIError* errhp;
OCIServer* srvhp;
OCISession* seshp;

OCIInitialize((ub4) OCI_DEFAULT, (dvoid*)0, (dvoid* (*)(dsize_t)) 0, (dvoid* (*)(dvoid*, dvoid*, dsize_t))0, (void (*)(dvoid*, dvoid*)) 0);
OCIHandleAlloc((dvoid*)envhp, (dvoid**)&errhp, OCI_HTYPE_ERROR, 0, (dvoid**)0);
OCIServerAttach(srvhp, errhp, (text*)connection_string, strlen(connection_string), 0);

OCIHandleAlloc((dvoid*)envhp, (dvoid**)&seshp, OCI_HTYPE_SESSION, 0, (dvoid**)0);
OCIAttrSet((dvoid*)seshp, OCI_HTYPE_SESSION, (dvoid*)username, strlen(username), OCI_ATTR_USERNAME, errhp);
OCIAttrSet((dvoid*)seshp, OCI_HTYPE_SESSION, (dvoid*)password, strlen(password), OCI_ATTR_PASSWORD, errhp);

OCIHandleAlloc((dvoid*)envhp, (dvoid**)&svchp, OCI_HTYPE_SVCCTX, 0, (dvoid**)0);
OCIAttrSet((dvoid*)svchp, OCI_HTYPE_SVCCTX, (dvoid*)srvhp, 0, OCI_ATTR_SERVER, errhp);
OCIAttrSet((dvoid*)svchp, OCI_HTYPE_SVCCTX, (dvoid*)seshp, 0, OCI_ATTR_SESSION, errhp);

步骤4：准备SQL语句

接下来，我们需要准备SQL语句。以下代码片段展示了如何执行一个INSERT语句：

OCIStmt* stmthp;
OCIHandleAlloc((dvoid*)envhp, (dvoid**)&stmthp, OCI_HTYPE_STMT, 0, (dvoid**)0);
text* sql_stmt = (text*)"INSERT INTO test (id, name) VALUES (:id, :name)";
OCIStmtPrepare(stmthp, errhp, sql_stmt, strlen((char*)sql_stmt), OCI_NTV_SYNTAX, OCI_DEFAULT);

OCIBind* bndhp1;
OCIBind* bndhp2;
OCIHandleAlloc((dvoid*)envhp, (dvoid**)&bndhp1, OCI_HTYPE_BIND, 0, (dvoid**)0);
OCIHandleAlloc((dvoid*)envhp, (dvoid**)&bndhp2, OCI_HTYPE_BIND, 0, (dvoid**)0);
int id = 1;
text* name = (text*)"John";
OCIBindByName(stmthp, &bndhp1, errhp, (text*)":id", strlen(":id"), (dvoid*)&id, sizeof(int), SQLT_INT, (dvoid*)0, (ub2*)0, (ub2*)0, 0, (ub4)OCI_DEFAULT);
OCIBindByName(stmthp, &bndhp2, errhp, (text*)":name", strlen(":name"), (dvoid*)name, strlen((char*)name), SQLT_CHR, (dvoid*)0, (ub2*)0, (ub2*)0, 0, (ub4)OCI_DEFAULT);
OCIStmtExecute(svchp, stmthp, errhp, 1, 0, (OCISnapshot*)NULL, (OCISnapshot*)NULL, OCI_DEFAULT);

步骤5：批量插入数据

如果我们想要批量插入数据，我们需要使用OCI批量操作的API。以下代码片段展示了如何使用OCI批量操作的API批量插入数据：

OCIStmt* stmthp;
OCIHandleAlloc((dvoid*)envhp, (dvoid**)&stmthp, OCI_HTYPE_STMT, 0, (dvoid**)0);

text* sql_stmt = (text*)"INSERT INTO test (id, name) VALUES (:id, :name)";
OCIStmtPrepare(stmthp, errhp, sql_stmt, strlen((char*)sql_stmt), OCI_NTV_SYNTAX, OCI_DEFAULT);
OCIBind* bndhp1;
OCIBind* bndhp2;
OCIHandleAlloc((dvoid*)envhp, (dvoid**)&bndhp1, OCI_HTYPE_BIND, 0, (dvoid**)0);
OCIHandleAlloc((dvoid*)envhp, (dvoid**)&bndhp2, OCI_HTYPE_BIND, 0, (dvoid**)0);
int id[10] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
text* name[10] = {(text*)"John", (text*)"David", (text*)"Sarah", (text*)"Emily", (text*)"Richard", (text*)"Michael", (text*)"William", (text*)"Thomas", (text*)"Margaret", (text*)"Jane"};
OCIBindByName(stmthp, &bndhp1, errhp, (text*)":id", strlen(":id"), (dvoid*)&id, sizeof(int), SQLT_INT, (dvoid*)0, (ub2*)0, (ub2*)0, 10, (ub4*)0);
OCIBindByName(stmthp, &bndhp2, errhp, (text*)":name", strlen(":name"), (dvoid*)name, strlen((char*)name[0]), SQLT_STR, (dvoid*)0, (ub2*)0, (ub2*)0, 10, (ub4*)0);
OCIStmtExecute(svchp, stmthp, errhp, 10, 0, (OCISnapshot*)NULL, (OCISnapshot*)NULL, OCI_DEFAULT);

在这个示例中，我们使用了一个数组来存储数据，然后使用OCI批量操作的API批量插入数据。

结论

本文介绍了如何使用C语言实现快速的Oracle数据批量插入。我们需要先连接到Oracle数据库，然后准备SQL语句，最后使用OCI批量操作的API批量插入数据。这个方法可以大大提高数据插入的效率，尤其是在需要插入大量数据的情况下。