一、前期准备
1、安装数据库(如:mysql5.5)
2、安装Eclipse(如:3.4)
3、下载数据库驱动包
4、下载dbutis工具包
5、在Eclipse创建名为 dbutils 的工程并在工程下创建名为lib的文件夹。
将commons-dbutils-1.2.jar与mySql的驱动包拷贝到lib目录
选中这两个jar包右击->build path-->Add to build path
二:
1、在scr目录下创建名为dbcpconfig.properties的文件内容如下
#连接设置 driverClassName=com.mysql.jdbc.Driver url=jdbc:mysql://localhost:3306/mydb username=root password=root #<!-- 以上非常重要 --> #<!-- 初始化连接 --> initialSize=10 #最大连接数量 maxActive=50 #<!-- 最大空闲连接 --> maxIdle=20 #<!-- 最小空闲连接 --> minIdle=5 #<!-- 超时等待时间以毫秒为单位 6000毫秒/1000等于60秒 --> maxWait=60000 #JDBC驱动建立连接时附带的连接属性属性的格式必须为这样:[属性名=property;] #注意:"user" 与 "password" 两个属性会被明确地传递,因此这里不需要包含他们。 connectionProperties=useUnicode=true;characterEncoding=utf8 #指定由连接池所创建的连接的自动提交(auto-commit)状态。 defaultAutoCommit=true #driver default 指定由连接池所创建的连接的只读(read-only)状态。 #如果没有设置该值,则“setReadOnly”方法将不被调用。(某些驱动并不支持只读模式,如:Informix) defaultReadOnly= #driver default 指定由连接池所创建的连接的事务级别(TransactionIsolation)。 #可用值为下列之一:(详情可见javadoc。)NONE,READ_UNCOMMITTED, READ_COMMITTED, REPEATABLE_READ, SERIALIZABLE defaultTransactionIsolation=READ_COMMITTED
2、创建包(com.fly31.domain)在该包下创建实体bean
import java.util.Date; public class User { private int id; private String name; private String password; private String email; private Date birthday; //getter和setter省略 }
然后依据实体bean创建数据表
create database mydb; use mydb; create table users( id int primary key, name varchar(40), password varchar(40), email varchar(60), birthday date );
3、创建JDBCUtils,用于创建连接
public class JdbcUtils { private static DataSource ds; private static ThreadLocal<Connection> tl = new ThreadLocal<Connection>(); //map static{ try{ Properties prop = new Properties(); InputStream in = JdbcUtils.class.getClassLoader().getResourceAsStream("dbcpconfig.properties"); prop.load(in); BasicDataSourceFactory factory = new BasicDataSourceFactory(); ds = factory.createDataSource(prop); }catch (Exception e) { throw new ExceptionInInitializerError(e); } } public static DataSource getDataSource(){ return ds; } public static Connection getConnection() throws SQLException{ try{ //得到当前线程上绑定的连接 Connection conn = tl.get(); if(conn==null){ //代表线程上没有绑定连接 conn = ds.getConnection(); tl.set(conn); } return conn; }catch (Exception e) { throw new RuntimeException(e); } } }
现在准备工作已经完成,可以用dbutils做增删查改操作了。
三、用dbutis对数据进行增删查改操作。
创建包(com.fly31.dbutils),在该包下创建类名为TestDbutils类
import java.sql.SQLException; import java.util.Date; import java.util.List; import org.apache.commons.dbutils.QueryRunner; import org.apache.commons.dbutils.handlers.BeanHandler; import org.apache.commons.dbutils.handlers.BeanListHandler; import org.junit.Test; import cn.itcast.domain.User; import cn.itcast.utils.JdbcUtils; public class TestDbutils{ //使用dbutils完成数据库的crud @Test public void insert() throws SQLException{ QueryRunner runner = new QueryRunner(JdbcUtils.getDataSource()); String sql = "insert into users(id,name,password,email,birthday) values(?,?,?,?,?)"; Object params[] = {2,"bbb","123","[email protected]",new Date()}; runner.update(sql, params); } @Test public void update() throws SQLException{ QueryRunner runner = new QueryRunner(JdbcUtils.getDataSource()); String sql = "update users set email=? where id=?"; Object params[] = {"[email protected]",1}; runner.update(sql, params); } @Test public void delete() throws SQLException{ QueryRunner runner = new QueryRunner(JdbcUtils.getDataSource()); String sql = "delete from users where id=?"; runner.update(sql, 1); } @Test public void find() throws SQLException{ QueryRunner runner = new QueryRunner(JdbcUtils.getDataSource()); String sql = "select * from users where id=?"; User user = (User) runner.query(sql, 1, new BeanHandler(User.class)); System.out.println(user.getEmail()); } @Test public void getAll() throws Exception{ QueryRunner runner = new QueryRunner(JdbcUtils.getDataSource()); String sql = "select * from users"; List list = (List) runner.query(sql, new BeanListHandler(User.class)); System.out.println(list); } @Test public void batch() throws SQLException{ QueryRunner runner = new QueryRunner(JdbcUtils.getDataSource()); String sql = "insert into users(id,name,password,email,birthday) values(?,?,?,?,?)"; Object params[][] = new Object[3][5]; for(int i=0;i<params.length;i++){ //3 params[i] = new Object[]{i+1,"aa"+i,"123",i + "@sina.com",new Date()}; } runner.batch(sql, params); } }