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daoimpl
nxist2202005014 2 years ago
parent 1cd7be773f
commit 98e45d1a9c
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FlowerDaoImpl.java
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package flowershop.daoimpl;
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 flowershop.dao.FlowerDao;
import flowershop.model.Flower;
public class FlowerDaoImpl implements FlowerDao {
//查询所有
@Override
public List<Flower> findAll() {
// TODO 自动生成的方法存根
String sql = "select productid,name,category,image,price,descn from flower";
List<Flower> list = new ArrayList<Flower>();
try (// 2.创建数据库连接
Connection conn = Jdbc.getConnection();
// 3.创建语句对象
PreparedStatement pstmt = conn.prepareStatement(sql);
// 4.绑定参数
// 5.执行查询
ResultSet rs = pstmt.executeQuery(sql)) {
// 6.遍历结果集
while (rs.next()) {
Flower f = new Flower();
f.setProductid(rs.getString("productid"));
f.setName(rs.getString("name"));
f.setCategory(rs.getString("category"));
f.setImage(rs.getString("image"));
f.setPrice(rs.getDouble("price"));
f.setDescn(rs.getString("descn"));
list.add(f);
}
} catch (SQLException e) {
// TODO 自动生成的 catch 块
e.printStackTrace();
}
return list;
}
//按主键查询用户
@Override
public Flower findById(String productid) {
// TODO 自动生成的方法存根
Connection conn = null;
PreparedStatement pstmt = null;
ResultSet rs = null;
String sql = "select productid,name,category,image,price,descn from flower where productid=?";
try {
// 2.创建数据库连接
conn = Jdbc.getConnection();// 1.加载驱动程序
// 3.创建语句对象
pstmt = conn.prepareStatement(sql);
// 4.绑定参数
pstmt.setString(1, productid);
// 5.执行查询
rs = pstmt.executeQuery();
// 6.遍历按主键查询
if (rs.next()) {
Flower f = new Flower();
f.setProductid(rs.getString("productid"));
f.setName(rs.getString("name"));
f.setCategory(rs.getString("category"));
f.setImage(rs.getString("image"));
f.setPrice(rs.getDouble("price"));
f.setDescn(rs.getString("descn"));
return f;
}
} catch (SQLException e) {
e.printStackTrace();
} finally {
if (rs != null) {
try {
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if (pstmt != null) {
try {
pstmt.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if (conn != null) {
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
return null;
}
//按名字查询
@Override
public List<Flower> findByCategory(String category) {
// TODO 自动生成的方法存根
Connection conn = null;
PreparedStatement pstmt = null;
ResultSet rs = null;
List<Flower> list = new ArrayList<Flower>();
String sql = "select productid,name,category,image,price,descn from flower where category=?";
try {
// 2.创建数据库连接
conn = Jdbc.getConnection();// 1.加载驱动程序
// 3.创建语句对象
pstmt = conn.prepareStatement(sql);
// 4.绑定参数
pstmt.setString(1,category);
// 5.执行查询
rs = pstmt.executeQuery();
// 6.遍历按主键查询
while (rs.next()) {
Flower f = new Flower();
f.setProductid(rs.getString("productid"));
f.setName(rs.getString("name"));
f.setCategory(rs.getString("category"));
f.setImage(rs.getString("image"));
f.setPrice(rs.getDouble("price"));
f.setDescn(rs.getString("descn"));
list.add(f);
}
} catch (SQLException e) {
e.printStackTrace();
} finally {
if (rs != null) {
try {
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if (pstmt != null) {
try {
pstmt.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if (conn != null) {
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
return list;
}
@Override
public int create(Flower flower) {
String sql = "insert into flower(productid,name,category,image,price,descn) values (?,?,?,?,?,?)";
try ( // 2.创建数据库连接
Connection conn = Jdbc.getConnection();
// 3.创建语句对象
PreparedStatement pstmt = conn.prepareStatement(sql);) {
// 4.绑定参数
pstmt.setString(1, flower.getProductid());
pstmt.setString(2, flower.getName());
pstmt.setString(3, flower.getCategory());
pstmt.setString(4, flower.getImage());
pstmt.setDouble(5, flower.getPrice());
pstmt.setString(6, flower.getDescn());
// 5.执行
int executeUpdate = pstmt.executeUpdate();
System.out.printf("成功插入%d数据\n", executeUpdate);
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
return 0;
}
@Override
public int modify(Flower flower) {
String sql = "update flower set price = ? where productid = ?";
try ( // 2.创建数据库连接
Connection conn = Jdbc.getConnection();
// 3. 创建语句对象
PreparedStatement pstmt = conn.prepareStatement(sql)) {
// 4. 绑定参数
pstmt.setDouble(1, flower.getPrice());
pstmt.setString(2, flower.getProductid());
// 5. 执行修改（C、U、D）
int executeUpdate = pstmt.executeUpdate();
System.out.printf("成功更新%d条数据。\n", executeUpdate);
} catch (SQLException e) {
e.printStackTrace();
}
return 0;
}
@Override
public int remove(Flower flower) {
String sql = "delete from flower where productid = ?";
try ( // 2.创建数据库连接
Connection conn = Jdbc.getConnection();
// 3. 创建语句对象
PreparedStatement pstmt = conn.prepareStatement(sql)) {
// 4. 绑定参数
pstmt.setString(1, flower.getProductid());
// 5. 执行修改（C、U、D）
int executeUpdate = pstmt.executeUpdate();
System.out.printf("成功删除%d条数据。\n", executeUpdate);
} catch (SQLException e) {
e.printStackTrace();
}
return 0;
}
}
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