フロントdaoインタフェースとProductsClassifyDaoの実装
3224 ワード
package cn.client.dao;
import java.util.List;
import cn.entity.ProductsClassify;
/*
* DAO
* */
public interface ProductsClassifyDao {
//
public List<ProductsClassify> productsClassifyList();
//
public int selectKey(String productsClassifyContent);
// name
public String selectName(int productsClassifyId);
}
package cn.client.dao.impl;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import cn.client.dao.BaseDao;
import cn.client.dao.ProductsClassifyDao;
import cn.entity.ProductsClassify;
/*
* DAO
* */
public class ProductsClassifyDaoImpl extends BaseDao implements
ProductsClassifyDao {
Connection conn = null;//
PreparedStatement pstmt = null;//
ResultSet rs = null;//
public List<ProductsClassify> productsClassifyList() {
List<ProductsClassify> productsClassifyList = new ArrayList<ProductsClassify>();
ProductsClassify item = null;
String sql = "select products_classify_id, products_classify_content from products_classify order by products_classify_id asc";
conn=this.getConnection();
try {
pstmt = conn.prepareStatement(sql);
rs = pstmt.executeQuery();
while(rs.next()){
item = new ProductsClassify(
rs.getInt(1),
rs.getString(2)
);
productsClassifyList.add(item);
}
} catch (SQLException e) {
e.printStackTrace();
}finally{
this.closeAll(conn, pstmt, rs);
}
return productsClassifyList;
}
//
public int selectKey(String productsClassifyContent){
String sql = "select products_classify_id from " +
"products_classify where products_classify_content=?";
int key = 0;
conn=this.getConnection();
try {
pstmt = conn.prepareStatement(sql);
pstmt.setString(1, productsClassifyContent);
rs = pstmt.executeQuery();
if(rs.next()){
key = rs.getInt(1);
}
} catch (SQLException e) {
e.printStackTrace();
}finally{
this.closeAll(conn, pstmt, rs);
}
return key;
}
// name
public String selectName(int productsClassifyId){
String sql = "select products_classify_content from products_classify" +
" where products_classify_id = ?";
String name = null;
conn=this.getConnection();
try {
pstmt = conn.prepareStatement(sql);
pstmt.setInt(1, productsClassifyId);
rs = pstmt.executeQuery();
if(rs.next()){
name = rs.getString(1);
}
} catch (SQLException e) {
e.printStackTrace();
}finally{
this.closeAll(conn, pstmt, rs);
}
return name;
}
}