Java單線程連接SQL server2012數據庫[JDBC驅動]

思維導圖 – Java通過JDBC驅動連接SQL server數據庫

一：文件結構

二：樣例代碼：

• BaseDao.java：

/*Auther: Jason
  Time:2016-6-24
*/

package cs;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

//import com.sun.corba.se.pept.transport.Connection;

/* 基本數據庫類 */
public class BaseDao {
    /* 數據庫驅動 */
    private static final String driver = "com.microsoft.sqlserver.jdbc.SQLServerDriver";

    /* 連接數據庫路徑 */
    private static final String url = "jdbc:sqlserver://localhost:1433;DatabaseName=MyDB";

    /* 用戶信息 */
    private static final String user = "sa";
    private static final String password = "chenmeng";

    /* 靜態塊執行加載數據庫驅動，只執行一次 */
    static {
        try {
            Class.forName(driver);
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
    }

    /*
     * connect, PreparedStatement, ResultSet 對象聲明 PreparedStatement作用於操作符
     */
    protected Connection conn;
    protected PreparedStatement pstmt;
    protected ResultSet rs;

    /* 功能函數 */
    /* 創建connection對象 */
    protected void getConnection() {
        if (conn == null) {
            try {
                conn = DriverManager.getConnection(url, user, password);
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }

    /* 獲取PSTMT對象, SQL語句作爲傳參 */
    protected void getPreparedStatement(String sql) {
        if (conn == null) {
            getConnection();
        }
        try {
            pstmt = conn.prepareStatement(sql);
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

    /* 沒有佔位符的SQL查詢 */
    protected void getResultSet(String sql) {
        if (pstmt == null) {
            getPreparedStatement(sql);
        }

        try {
            rs = pstmt.executeQuery();
        } catch (SQLException e) {

        }
    }

    /* 檢查關閉功能 */
    protected void close() {
        if (rs != null) {
            try {
                rs.close();
                rs = null;
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }

        if (pstmt != null) {
            try {
                pstmt.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }

        if (conn != null) {
            try {
                conn.close();
                conn = null;
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
}

• Book.java

package cs;

public class Book {
    /* 類私有屬性 */
    private int id;
    private String bookname;
    private String author;
    private String publisher;
    private int price;

    /* 默認構造函數 */
    public Book() {
        super();
    }

    public Book(String bookname, String author, int price) {
        super();
        this.bookname = bookname;
        this.author = author;
        this.price = price;
    }

    public Book(int id, String bookname, String author, int price) {
        super();
        this.id = id;
        this.bookname = bookname;
        this.author = author;
        this.price = price;
    }

    /* 操作屬性方法 */
    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getBookName() {
        return bookname;
    }

    public void setBookName(String bookname) {
        this.bookname = bookname;
    }

    public String getAuthor() {
        return author;
    }

    public void setAuthor(String author) {
        this.author = author;
    }

    public String getPublisher() {
        return publisher;
    }

    public void setPublisher(String publisher) {
        this.publisher = publisher;
    }

    public int getPrice() {
        return price;
    }

    public void setPrice(int price) {
        this.price = price;
    }
}

• BookDao,java

package cs;

import java.sql.SQLException;
import java.util.ArrayList;

public class BookDao extends BaseDao {
    public ArrayList<Book> queryBooksByPublisher(String publisher) {
        ArrayList<Book> bookList = new ArrayList<Book>();
        String sql = "select * from tbook where publisher=?";
        getPreparedStatement(sql);
        try {
            pstmt.setString(1, publisher);
            rs = pstmt.executeQuery();
            while (rs.next()) {
                /* 循環讀取SQL數據 */
                int id = rs.getInt("id");
                String name = rs.getString("name");
                String author = rs.getString("author");
                int price = rs.getInt("price");
                /* Book初始化 */
                Book book = new Book(id, name, author, price);
                bookList.add(book);
            }

        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            /* 釋放資源 */
            close();
        }

        return bookList;

    }
}

• BookTest.java

package cs;

import java.util.ArrayList;

public class BookTest {
    public static void main(String[] args) {
        /* 創建books對象數組 */
        ArrayList<Book> books = new BookDao()
                .queryBooksByPublisher("四川師範大學出版社");

        /* 迭代輸出books對象中的數據 */
        for (Book book : books) {
            System.out.println(book.getBookName() + book.getPrice());
        }
    }
}

三：數據庫表單

MyDB:

create table tbook(
    id int primary key,
    bookname varchar(20),
    author varchar(20),
    publisher varchar(50),
    price int
)

四：環境
1）平臺：Win10+ MyEclipse10+ 內置Tomcat6.0服務器；
2）JRE：Java1.8.0環境
3）JDBC驅動：sqljdbc4.jar
4）數據庫：SQLserver 2012

五：其他
1）有相關問題可以聯繫博主，郵箱：[email protected] 歡迎打擾；
2）下片博文預告：servlet + ThreadLocal解決多線程併發問題；
3）今後會新增changelog修改日誌；
4）如果有更好的解決方法，請fork；
5）參考資料：
http://blog.csdn.net/stewen_001/article/details/19553173/
http://blog.csdn.net/keenweiwei/article/details/7332261
http://blog.csdn.net/that3/article/details/7584454
http://blog.csdn.net/chenleixing/article/details/44024095
6）版權所有，不得轉載！