使用JDBC 插入向数据库插入对象

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package com.ctl.util;

import java.io.IOException;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

import javax.print.attribute.standard.Media;

import com.ctl.bean.Person;
import com.mysql.jdbc.Statement;

/**
 * 
 * @author Administrator
 * @category
 
 
 
 */
public class DButils {
	private static String driver;
	private static String url;
	private static String username;
	private static String password;
	private static Connection conn;
	private static ThreadLocal<Connection> connHolder = new ThreadLocal<Connection>();
	static {
		driver = ConfigUtils.getType("mysql.driver");
		url = ConfigUtils.getType("mysql.url");
		username = ConfigUtils.getType("mysql.username");
		password = ConfigUtils.getType("mysql.password");
		try {
			Runtime.getRuntime().exec("net start mysql");
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

	/**
	 * 
	 * @return Connection
	 * @throws SQLException
	 * @throws ClassNotFoundException
	 */
	public static Connection getConnection() throws SQLException,
			ClassNotFoundException {
		conn = connHolder.get();
		if (conn == null || conn.isClosed()) {
			Class.forName(driver);
			conn = DriverManager.getConnection(url, username, password);
			conn.setAutoCommit(false);
			connHolder.set(conn);
		}
		return conn;
	}

	/**
	 * @category 根据sql得到记录总数
	 * @param sql
	 * @return 如果返回-1代表出错
	 */
	public static int getCount(String sql) {
		try {
			ResultSet rs = getConnection().createStatement().executeQuery(sql);
			if (rs.next()) {
				return rs.getInt(1);
			}
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return -1;

	}

	/**
	 * @category close Connection
	 * @throws SQLException
	 */
	public static void close() throws SQLException {
		conn.close();
		connHolder.set(null);
	}

	public static int createTable(Class c) {
		String tableName = c.getSimpleName().toLowerCase();// person
		return 0;

	}

	/*
	 * public static void insertEntity(Class c, Object o) {
	 * System.out.println(o); Object fileds[] = o.toString().split("__"); int
	 * fieldSize = fileds.length; System.out.println(fieldSize); String
	 * tableName = c.getSimpleName().toLowerCase();// person // String
	 * className=c.getSimpleName();//Person int bookIsExis = getCount(
	 * "SELECT count(table_name) FROM information_schema.TABLES WHERE table_name=‘"
	 * + tableName + "‘ "); if (bookIsExis < 1) { System.out.println("表不存在");
	 * return; } StringBuffer sql = new StringBuffer("insert into " + tableName
	 * + " values("); for (int i = 0; i < fieldSize; i++) { sql.append("?,"); }
	 * sql.deleteCharAt(sql.length() - 1); sql.append(")");
	 * System.out.println(sql); PreparedStatement ps; try { ps =
	 * getConnection().prepareStatement(sql.toString()); for (int i = 0; i <
	 * fieldSize; i++) { if (fileds[i] != null && !"".equals(fileds[i]) &&
	 * !"null".equals(fileds[i])) { ps.setObject(i + 1, fileds[i]); } else {
	 * ps.setObject(i + 1, null); } } ps.executeUpdate();
	 * getConnection().commit(); } catch (Exception e) { e.printStackTrace(); }
	 * 
	 * }
	 */
	public static void insertEntity(Class c, Object obj) {
		// System.out.println("1");
		if (obj == null || c.getSimpleName().equals(obj.getClass().getName()))
			return;
		Field[] fields = obj.getClass().getDeclaredFields();
		int fieldSize = fields.length;
		String tableName = c.getSimpleName().toLowerCase();// person
		String[] types1 = { "int", "java.lang.String", "boolean", "char",
				"float", "double", "long", "short", "byte" };
		String[] types2 = { "Integer", "java.lang.String", "java.lang.Boolean",
				"java.lang.Character", "java.lang.Float", "java.lang.Double",
				"java.lang.Long", "java.lang.Short", "java.lang.Byte" };

		StringBuffer sql = new StringBuffer("insert into " + tableName
				+ " values(");
		for (int i = 0; i < fieldSize; i++) {
			sql.append("?,");
		}
		sql.deleteCharAt(sql.length() - 1);
		sql.append(")");
		System.out.println(sql);
		PreparedStatement ps = null;
		try {
			ps = getConnection().prepareStatement(sql.toString());
			for (int j = 0; j < fieldSize; j++) {
				fields[j].setAccessible(true);
				for (int i = 0; i < types1.length; i++) {
					if (fields[j].getType().getName()
							.equalsIgnoreCase(types1[i])
							|| fields[j].getType().getName()
									.equalsIgnoreCase(types2[i])) {

						if (fields[j].get(obj) != null
								&& !"".equals(fields[j].get(obj))
								&& !"null".equals(fields[j].get(obj))) {
							System.out.println(fields[j].get(obj) + " ");
							ps.setObject(j + 1, fields[j].get(obj));
						} else {
							System.out.println(fields[j].get(obj) + " ");
							ps.setObject(j + 1, null);
						}
					}
				}
			}
			System.out.println(ps.toString());
			ps.executeUpdate();
			getConnection().commit();
		} catch (Exception e1) {
			e1.printStackTrace();
		}

	}

	public static void main(String[] args) {
		try {
			DButils.getConnection();
			// System.out.println(getCount("SELECT count(table_name) FROM information_schema.TABLES WHERE table_name=‘book‘ "));
			Person person = new Person();
			person.setId(1);
			person.setAddress("xin xiang");
			insertEntity(Person.class, person);
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (ClassNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
}

使用JDBC 插入向数据库插入对象,布布扣,bubuko.com

使用JDBC 插入向数据库插入对象

标签：blog   class   code   java   tar   ext   

原文地址：http://blog.csdn.net/ctllin/article/details/25350535