• 下面是一個簡單的建立資料庫連線的程式碼：

#include "ocilibDemo.h"

void err_handler(OCI_Error *err)
{
    printf(
                "code  : ORA-%05i\n"
                "msg   : %s\n"
                "sql   : %s\n",
                OCI_ErrorGetOCICode(err), 
                OCI_ErrorGetString(err),
                OCI_GetSql(OCI_ErrorGetStatement(err))
           );
}

void conn()
{
    OCI_Connection *cn; 

    if
 
 (!OCI_Initialize(err_handler, NULL, OCI_ENV_DEFAULT))
        return;

    cn = OCI_ConnectionCreate(tnsName, user, password, OCI_SESSION_DEFAULT);

    if (cn != NULL) {
        printf(OCI_GetVersionServer(cn)); 

        printf("Server major    version : %i\n", OCI_GetServerMajorVersion(cn)); 
        printf("Server minor    version : %i\n"
 
, OCI_GetServerMinorVersion(cn)); 
        printf("Server revision version : %i\n", OCI_GetServerRevisionVersion(cn)); 

        printf("Connection      version : %i\n", OCI_GetVersionConnection(cn)); 

        /* ... application code here ... */ 

        OCI_ConnectionFree(cn); 
    }

    OCI_Cleanup(); 

    return
 
; 
}

其中err_handler是作為異常處理函式，會在資料庫error發生時被呼叫。
注意ocilib程式碼在編譯時要設定巨集/DOCI_API=__stdcall和/DOCI_CHARSET_XXX，XXX是具體字符集型別有三種：
1. OCI_CHARSET_ANSI : all strings are in ANSI
2. OCI_CHARSET_UNICODE : all strings are Unicode (versions of Oracle> = 9i)
3. OCI_CHARSET_MIXED : SQL statements + metadata are in ANSI, user data and resultset data in Unicode
客戶端和伺服器端最好都統一設定ANSI或者UNICODE，避免麻煩。

• 資料庫操作程式碼

void  createTable(){
    OCI_Statement  *st = NULL;
    OCI_Connection *cn;

    if (!OCI_Initialize(err_handler, NULL, OCI_ENV_DEFAULT))
        return;

    cn = OCI_ConnectionCreate(tnsName, user, password, OCI_SESSION_DEFAULT);

    if (cn!=NULL) {
        st = OCI_StatementCreate(cn);
        char sql[]=MT("create table test_table ")
                   MT("( ")
                   MT("val_int  number, ")
                   MT("val_flt  float, ")
                   MT("val_str  varchar2(30), ")
                   MT("val_date date")
                   MT(")");
        cout<<"Create table:\n"<<sql<<endl;
        OCI_ExecuteStmt(st, sql);
        OCI_ConnectionFree(cn); 
    }

    OCI_Cleanup();
}

void dropTable(){
    OCI_Statement  *st = NULL;
    OCI_Connection *cn;

    if (!OCI_Initialize(err_handler, NULL, OCI_ENV_DEFAULT))
        return;

    cn = OCI_ConnectionCreate(tnsName, user, password, OCI_SESSION_DEFAULT);

    if (cn!=NULL) {
        st = OCI_StatementCreate(cn);
        char sql[]=MT("drop table test_table");
        cout<<"Drop table:\n"<<sql<<endl;
        OCI_ExecuteStmt(st, sql);
        OCI_ConnectionFree(cn); 
    }

    OCI_Cleanup();
}

void insertBind(){
    OCI_Date *date;

    int i;
    double flt;

    OCI_Statement  *st = NULL;
    OCI_Connection *cn;

    if (!OCI_Initialize(err_handler, NULL, OCI_ENV_DEFAULT))
        return;

    cn = OCI_ConnectionCreate(tnsName, user, password, OCI_SESSION_DEFAULT);
    if (cn!=NULL) {
        st = OCI_StatementCreate(cn);
        char sql[]=MT("insert into test_table ")
                   MT("( ")
                   MT("   val_int,  val_flt, val_str, val_date")
                   MT( ") " )
                   MT( "values ")
                   MT( "( ")
                   MT( "   :val_int, :val_flt, :val_str, :val_date")
                   MT(") ");
        cout<<"Intsert table:\n"<<sql<<endl;
        OCI_Prepare(st, sql);
        i   = 1;
        flt = 3.14;
        string s="sfsdfsdfsfsdfsdfsd";
        date = OCI_DateCreate(cn);
        OCI_DateSysDate(date);

        OCI_BindInt(st, MT(":val_int"),  &i);
        OCI_BindDouble(st, MT(":val_flt"), &flt);
        OCI_BindString(st, MT(":val_str"), const_cast<char *>(s.c_str()), 30);
        OCI_BindDate(st, MT(":val_date"), date);
        OCI_Execute(st);
        OCI_DateFree(date);
        OCI_Commit(cn);

        OCI_ConnectionFree(cn); 
    }

    OCI_Cleanup();
}

void insertArray(){
    OCI_Connection *cn;
    OCI_Statement  *st;
    OCI_Error      *err;
    int count=20000000;

    int batchSize=5000;
    int tab_int[batchSize];
    double tab_flt[batchSize];
    char tab_str[batchSize][31];
    OCI_Date* tab_date[batchSize];

    int i;

    if (!OCI_Initialize(err_handler, NULL, OCI_ENV_DEFAULT))
        return;

    cn = OCI_ConnectionCreate(tnsName, user, password, OCI_SESSION_DEFAULT);
    st = OCI_StatementCreate(cn);

    OCI_Prepare(st, "insert into test_table values(:i, :f, :s, :t)");
    OCI_BindArraySetSize(st, batchSize);
    OCI_BindArrayOfInts(st, ":i", tab_int, 0);
    OCI_BindArrayOfDoubles(st, ":f", tab_flt, 0);
    OCI_BindArrayOfStrings(st, ":s", (char*) tab_str, 30, 0);
    OCI_BindArrayOfDates(st,":t",tab_date,0);


    for (i=0;i<batchSize;i++) {
        tab_int[i] = i+1;
        tab_flt[i]=3.14;
        sprintf(tab_str[i],"Name %d",i+1);

        tab_date[i] = OCI_DateCreate(cn);
        OCI_DateSysDate(tab_date[i]);
    }

    int round=count/batchSize;

    clock_t start=clock();
    cout<<start<<endl;
    for (int j=0;j<round;j++) {
        if (!OCI_Execute(st)) {
            printf("Number of DML array errors : %d\n", OCI_GetBatchErrorCount(st));       

            err = OCI_GetBatchError(st);

            while (err) {
                printf("Error at row %d : %s\n", OCI_ErrorGetRow(err), OCI_ErrorGetString(err));       

                err = OCI_GetBatchError(st);
            }
        }
        OCI_Commit(cn);
//      printf("row processed : %d\n", OCI_GetAffectedRows(st));
    }

    clock_t stop=clock();
    cout<<stop<<endl;
    int costTime=stop-start;
    double numberPerSec=(count/costTime)*1000;
    cout<<"Insert records "<<count<<" cost time "<<costTime<<" ms"<<endl;
    cout<<"Insert records "<<numberPerSec<<"records/s "<<endl;
    for (i=0;i<batchSize;i++) {
        OCI_DateFree(tab_date[i]);
    }
    OCI_Commit(cn);
    OCI_ConnectionFree(cn);
    OCI_Cleanup();

    return;
}

ocilib的程式碼可以跑在裝有Oracle client或instant client的任何機器上，通過tns訪問資料庫，如果是instant client注意設定tns和home路徑。