增删改查-向日葵屋

增删改查

package cn.itcast.jdbc;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
public class CRUD {
    public static void main(String[] args) {
    }
    static void create() throws SQLException {
        Connection conn = null;
        Statement st = null;
        ResultSet rs = null;
        try {
            conn = JdbcUtils.getConnection();
            st = conn.createStatement();
            String sql = "insert into user(name,birthday,money)values('name1','1987-1-1',400)";
            int i = st.executeUpdate(sql);
            System.out.println("i=" + i);
        } finally {
            JdbcUtils.free(rs, st, conn);
        }
    }
    static void read() throws SQLException {
        Connection conn = null;
        Statement st = null;
        ResultSet rs = null;
        try {
            conn = JdbcUtils.getConnection();
            st = conn.createStatement();
            rs = st.executeQuery("select id,name,birthday,money from user");
            while (rs.next()) {
                System.out.println("id:" + rs.getObject("id") + "\tname:"
                        + rs.getObject("name") + "\tbirthday:"
                        + rs.getObject("birthday") + "\tmoney:"
                        + rs.getObject("money"));
            }
        } finally {
            JdbcUtils.free(rs, st, conn);
        }
    }
    static void update() throws SQLException {
        Connection conn = null;
        Statement st = null;
        ResultSet rs = null;
        try {
            conn = JdbcUtils.getConnection();
            st = conn.createStatement();
            String sql = "update user set money=money+10";
            int i = st.executeUpdate(sql);
            System.out.println("i=" + i);
        } finally {
            JdbcUtils.free(rs, st, conn);
        }
    }
    static void delete() throws SQLException {
        Connection conn = null;
        Statement st = null;
        ResultSet rs = null;
        try {
            conn = JdbcUtils.getConnection();
            st = conn.createStatement();
            String sql = "delete from user where id>=4";
            int i = st.executeUpdate(sql);
            System.out.println("i=" + i);
        } finally {
            JdbcUtils.free(rs, st, conn);
        }
    }
}