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JDBC之封裝通用的BaseDao

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以上篇文章（JDBC之在分層結構中實現業務）為基礎，進行封裝更新操作；

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一、持久層（數據訪問層）

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在dao包下創建通用方法接口BaseDao

public interface BaseDao{public int executeUpdate(String sql , Object[] param); }

在dao.impl包下創建接口BaseDao的實現類；

import java.sql.Connection; import java.sql.ParameterMetaData; import java.sql.PreparedStatement;import com.bjsxt.commons.JdbcUtil; import com.bjsxt.dao.BaseDao;public class BaseDaoImpl implements BaseDao{//封裝通用的dml操作public int executeUpdate(String sql , Object[] param){Connection conn = null;PreparedStatement ps = null;int rows = 0;try{conn = JdbcUtil.getConnection(); conn.setAutoCommit(false);ps = conn.prepareStatement(sql);//得到參數的個數ParameterMetaData pmd = ps.getParameterMetaData();//綁定參數for(int i=0;i<pmd.getParameterCount();i++){ps.setObject(i+1,param[i]);}rows = ps.executeUpdate();conn.commit();}catch(Exception e){JdbcUtil.rollback(conn);e.printStackTrace();}finally{JdbcUtil.closeResource(ps,conn);}return rows; } }

讓DepartmentsDao接口繼承BaseDao接口，并添加更新數據的抽象方法；

public interface DepartmentsDao extends BaseDao {public int updateDept(Departments dept); }

讓DepartmentsDaoImpl繼承BaseDaoImpl類，并實現DepartmentsDao中的更新數 據的方法；

import java.sql.Connection; import java.sql.PreparedStatement; import java.sql.ResultSet; import com.bjsxt.commons.JdbcUtil; import com.bjsxt.dao.DepartmentsDao; import com.bjsxt.pojo.Departments;public class DepartmentsDaoImpl extends BaseDaoImpl implements DepartmentsDao{public int updateDept(Departments dept){String sql = "update departments set department_name = ? , location_id = ? where department_id = ? ";Object[] param = new Object[]{dept.getDepartmentName() , dept.getLocationId() , dept.getDepartmentId()};return this.executeUpdate(sql,param); } }

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二、業務層

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將service包下的DepartmentsService接口中添加更新數據的抽象方法；

import com.bjsxt.pojo.Departments;public interface DepartmentsService{public int modifyDepartments(Departments dept); }

將service.Impl包下的DepartmentsServiceImpl類，實現DepartmentsService中的更新數據方法；

import com.bjsxt.dao.DepartmentsDao; import com.bjsxt.dao.impl.DepartmentsDaoImpl; import com.bjsxt.pojo.Departments; import com.bjsxt.serivce.DepartmentsService;public class DepartmentsServiceImpl implements DepartmentsService{public int modifyDepartments(Departments dept){DepartmentsDao deptDao = new DepartmentsDaoImpl();return deptDao.updateDept(dept);} }

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三、測試類

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將部門id為52的部門改為“陸上部”地點ID為40；

public class Test{public static void main(String[] args){Departments dept = new Departments();dept.setDepartmentName("陸上部");dept.setLocationId(40);dept.setDepartmentId(52);DepartmentsService ds = new DepartmentsServiceImpl();int flag = ds.modifyDepartments(dept);System.out.println(flag);} } 《新程序員》：云原生和全面數字化實踐50位技術專家共同創作，文字、視頻、音頻交互閱讀

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