JDBC-数据库的更新操作编程（三）

首先建立一个静态方法，代码如下：

public static Statement getStatement(){
        Statement st = null;
        try {
            Class.forName("com.mysql.jdbc.Driver");
            Connection conn = (Connection) DriverManager.getConnection("jdbc:mysql://localhost:3306/jsp_dbb", "root", "");
            st = (Statement) conn.createStatement();
        } catch (Exception e) {
            // TODO: handle exception
        }
        return st;
    }

这个静态类获取Statement，通过Statement类来实现添加，更新和删除操作，分别是静态代码实现的。全部代码如下：

public static Statement getStatement(){
        Statement st = null;
        try {
            Class.forName("com.mysql.jdbc.Driver");
            Connection conn = (Connection) DriverManager.getConnection("jdbc:mysql://localhost:3306/jsp_dbb", "root", "");
            st = (Statement) conn.createStatement();
        } catch (Exception e) {
            // TODO: handle exception
        }
        return st;
    }
    public static void insert(){
        try {
            String sql = "INSERT INTO tbl_user(name,password,email)" +
                    "VALUES('Tom','123456','[e-mail]')";
            Statement st = getStatement();
            int count = st.executeUpdate(sql);
            System.out.println("插入了"+count+"行数据");
        } catch (Exception e) {
            // TODO: handle exception
        }
    }
    public static void update(){
        try {
            String sql = "UPDATE tbl_user SET email='[e-mail]' WHERE name='Tom'";
            Statement st = getStatement();
            int count = st.executeUpdate(sql);
            System.out.println("更新了"+count+"行数据");
        } catch (Exception e) {
            // TODO: handle exception
        }
    }
    public static void delete(){
        try {
            String sql = "DELETE FROM tbl_user WHERE name='Tom'";
            Statement st = getStatement();
            int count = st.executeUpdate(sql);
            System.out.println("删除了"+count+"行数据");
        } catch (Exception e) {
            //
            }
        }
    public static void main(String[] args) {
                //insert();
                //update();
                delete();
    }