Oracle is a world-renowned database management system provider. Its API (Application Programming Interface, application program interface) is a powerful tool that helps developers easily interact with Oracle. Database interaction and integration. In this article, we will delve into the Oracle API usage guide, show readers how to utilize data interface technology during the development process, and provide specific code examples.

1. Oracle API Overview

Oracle provides a variety of APIs for developers to use, mainly including:

• JDBC API: Java Database Connectivity API, suitable for Java developer, used to connect and operate Oracle database.
• PL/SQL API: Suitable for developers who use Oracle's stored procedures and functions for database operations.
• REST API: Use RESTful style to perform database operations through HTTP protocol.
• Oracle Call Interface (OCI): A process-based API provided for C/C developers.

2. Oracle API Usage Guide

2.1 JDBC API

JDBC API is one of the standard interfaces for connecting Java applications and Oracle databases. The following is a simple code example that demonstrates how to use the JDBC API to connect to an Oracle database and perform query operations:

import java.sql.*;

public class OracleJDBCExample {
    public static void main(String[] args) {
        String url = "jdbc:oracle:thin:@localhost:1521:ORCL";
        String user = "username";
        String password = "password";
        
        try {
            Connection conn = DriverManager.getConnection(url, user, password);
            Statement stmt = conn.createStatement();
            ResultSet rs = stmt.executeQuery("SELECT * FROM employees");
            
            while (rs.next()) {
                System.out.println(rs.getString("employee_name"));
            }
            
            conn.close();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}

2.2 PL/SQL API

If you are used to using Oracle's stored procedures and functions For database operations, you can use the PL/SQL API to call these procedures and functions. The following is a simple PL/SQL API example that demonstrates how to call a stored procedure:

CREATE OR REPLACE PROCEDURE get_employee_details (employee_id IN NUMBER)
IS
    employee_name employees.employee_name%TYPE;
BEGIN
    SELECT employee_name INTO employee_name
    FROM employees
    WHERE employee_id = employee_id;
    
    DBMS_OUTPUT.PUT_LINE('Employee Name: ' || employee_name);
END;

2.3 REST API

Oracle also provides a REST API to operate the database. Through HTTP requests, you can perform CRUD operations using a RESTful style API. The following is a simple REST API example that demonstrates how to use the REST API to query employee information:

GET /api/employees

Response:
{
    "employees": [
        {
            "id": 1,
            "name": "Alice",
            "department": "IT"
        },
        {
            "id": 2,
            "name": "Bob",
            "department": "HR"
        }
    ]
}

2.4 OCI API

OCI is the abbreviation of Oracle Call Interface, which is aimed at C/C developers API provides low-level access to Oracle database. The following is a simple OCI API example that demonstrates how to connect to an Oracle database and perform query operations:

#include <stdio.h>
#include <oci.h>

int main() {
    OCIEnv *env;
    OCIError *err;
    OCIServer *srv;
    OCISvcCtx *svc;
    OCIStmt *stmt;
    
    // Initialize OCI environment and connect to database
    
    // Prepare and execute SQL statement
    
    // Process query results
    
    // Clean up resources
    
    return 0;
}

Conclusion

This article delves into the Oracle API usage guide, showing how to use different types API to interact and integrate with Oracle database. Whether you are a Java developer, PL/SQL developer, REST API user or C/C developer, you can easily use Oracle API to perform data operations based on the specific code examples provided in this article. I hope this article can help readers in the development process and further explore and apply Oracle's API technology.

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