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接上一章节 HQL的预编译语句
HIbernate中的预编译与Spring的预编译的处理差不多。
1:使用标准的?
2:使用命名参数
2.1:使用名称逐个设置。
2.2:使用Map(key的值等于参数的名称)
2.3:使用Bean(属性的名称等于参数的名称)
案例一:Query_HQL_Prepared.java
package action; import java.util.HashMap; import java.util.List; import java.util.Map; import org.hibernate.Query; import org.hibernate.Session; import org.hibernate.Transaction; import bean.User; import util.HibernateUtil; /** * 本类测试HQL的预处理指令 * * HIbernate中的预编译与Spring的预编译的处理差不多。 * * 1:使用标准的? * * 2:使用命名参数 * * 2.1:使用名称逐个设置。 * * 2.2:使用Map(key的值等于参数的名称) * * 2.3:使用Bean(属性的名称等于参数的名称) * * @author 半颗柠檬、 * */ public class Query_HQL_Prepared { public static void main(String[] args) { // Query_HQL_Prepared.one(); // 使用标准的 ? // Query_HQL_Prepared.two(); //使用名称逐个设置。 // Query_HQL_Prepared.three(); // 使用Map(key的值等于参数的名称) Query_HQL_Prepared.four(); //使用Bean(属性的名称等于参数的名称) } /* * 使用标准的? */ private static void one() { Session session = null; Transaction tran = null; Query query = null; String hql = ""; try { session = HibernateUtil.getSession(); tran = session.beginTransaction(); hql = " select u from User u where userid<=? and userid>=? and username like ?"; /** * HQL的索引是从0开始的 */ query = session.createQuery(hql); query.setParameter(0, 6); query.setParameter(1, 1); query.setParameter(2, "%user%"); List<User> userList = query.list(); for (User user : userList) { System.out.println("username=" + user.getUsername() + "\t userid=" + user.getUserid()); } tran.commit(); } catch (Exception e) { tran.rollback(); e.printStackTrace(); } finally { HibernateUtil.closeSession(); } } /** * 使用名称逐个设置 */ private static void two() { Session session = null; Query query = null; Transaction tran = null; String sql = ""; try { session = HibernateUtil.getSession(); tran = session.beginTransaction(); sql = " select u from User u where username like :username and userid>= :userid_begin and userid<= :userid_end "; query = session.createQuery(sql); query.setString("username", "%user%"); query.setInteger("userid_begin", 3); query.setInteger("userid_end", 5); List<User> userList = query.list(); for (User user : userList) { System.out.println("username=" + user.getUsername() + "\t userid=" + user.getUserid()); } tran.commit(); } catch (Exception e) { e.printStackTrace(); tran.rollback(); } finally { HibernateUtil.closeSession(); } } /** * 使用Map(key的值等于参数的名称) */ private static void three() { Session session = null; Transaction tran = null; Query query = null; String sql = ""; try { session=HibernateUtil.getSession(); tran=session.beginTransaction(); sql=" select u from User u where userid>= :userid_begin and userid<= :userid_end and username like :username"; query=session.createQuery(sql); Map<String,Object> sqlMap=new HashMap<String,Object>(); sqlMap.put("userid_begin", 3); sqlMap.put("userid_end",5); sqlMap.put("username", "%user%"); query.setProperties(sqlMap); List<User> userList = query.list(); for (User user : userList) { System.out.println("username=" + user.getUsername() + "\t userid=" + user.getUserid()); } tran.commit(); } catch (Exception e) { e.printStackTrace(); tran.rollback(); } finally { HibernateUtil.closeSession(); } } /** * 使用Bean(属性的名称等于参数的名称) */ private static void four() { Session session = null; Query query = null; Transaction tran = null; String sql=""; try { session=HibernateUtil.getSession(); tran=session.beginTransaction(); sql=" select u from User u where username like :username and userid>= :userid_begin and userid<= :userid_end "; User user=new User(); user.setUsername("%user%"); user.setUserid_begin(3); //User bean中一定要有userid_begin和userid_end属性,且要有get和set方法 user.setUserid_end(5); query=session.createQuery(sql); query.setProperties(user); List<User> userList = query.list(); for (User use1r : userList) { System.out.println("username=" + use1r.getUsername() + "\t userid=" + use1r.getUserid()); } tran.commit(); } catch (Exception e) { e.printStackTrace(); tran.rollback(); }finally{ HibernateUtil.closeSession(); } } }
时间: 2024-11-10 00:25:39