Java連接MySQL

Java連接MySQL

1 下載安裝Connector/J，下載地址：http://www.mysql.com/products/connector/。Connector/J是專門針對MySQL而開發的JDBC驅動程序包。
2 將安裝目錄下的mysql-connector-java-5.1.36-bin.jar添加到環境變量的classpath，或者添加到項目的Java Build Path。
3 JDBC基本編程的步驟：

加載驅動
其使用的方法有Class.forName()或者
Class.forName().newInstance()或者
new DriverName() 連接數據庫
DriverManager.getConnection() 執行SQL語句
Connection.CreateStatement()
Statement.executeQuery()
Statement.executeUpdate() 取得結果集
while(rs.next()) 顯示數據
將數據庫中的各種類型轉化為java中的類型（getXXX）方法 關閉
close the resultset
close the statement
close the connection

實例：

package ms;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;
import java.sql.ResultSet;

public class TestMySQL {
    public static void main(String[] args){
        ResultSet rs = null;
        Statement stmt = null;
        Connection conn = null;
        try{
            Class.forName("com.mysql.jdbc.Driver"); //創建該字符串標識的類的實例
            String url = "jdbc:mysql://localhost:3306/test"; //標識一個被注冊的驅動程序
            String user = "root";
            String pwd = "";
            conn = DriverManager.getConnection(url, user, pwd);
            stmt = conn.createStatement();
            String query = "select * from person where age > 18";
            rs = stmt.executeQuery(query);
            while (rs.next()){
                String id = rs.getString("id");
                String name = rs.getString(2);
                int age = rs.getInt("age");
                System.out.println(id + "\t" + name + "\t" + age);
            }
        }
        catch (ClassNotFoundException e){
            e.printStackTrace();
        }
        catch (SQLException e){
            e.printStackTrace();
        }
        finally {
            try{
                if (rs != null){
                    rs.close();
                }
                if (stmt != null){
                    stmt.close();
                }
                if (conn != null){
                    conn.close();
                }
            }
            catch (SQLException e){
                e.printStackTrace();
            }
        }
    }
}

PreparedStatement的預處理語句：

String sql = "insert into person values(?,?,?)";
PreparedStatement pstmt = conn.prepareStatement(sql);
pstmt.setString(1, "005");
pstmt.setString(2, "Zhao");
pstmt.setInt(3, 18);
pstmt.executeUpdate();

statement語句的批處理：

Statement stmt = conn.createStatement();
stmt.addBatch("insert into person values('006', 'Zeng', 26)");
stmt.addBatch("insert into person values('007', 'Liu', 24)");
stmt.addBatch("insert into person values('008', 'Zeng', 17)");
stmt.executeBatch();

PreparedStatement語句的批處理

String sql = "insert into person values(?,?,?)";
PreparedStatement pstmt = conn.prepareStatement(sql);
pstmt.setString(1, "006");
pstmt.setString(2, "Zeng");
pstmt.setInt(3, 26);

pstmt.setString(1, "007");
pstmt.setString(2, "Liu");
pstmt.setInt(3, 24);

pstmt.setString(1, "008");
pstmt.setString(2, "Zeng");
pstmt.setInt(3, 17);
pstmt.executeUpdate();