实例介绍
【实例简介】
实现了班级学生信息管理(增,删,改,查)
【实例截图】【核心代码】
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using InfoClass.BLL;
using System.ComponentModel;
namespace InfoClass.DAL
{
public class OperateSq
{
private string[] opear={
"INSERT INTO t_class(className,classSlogan)Values('{0}','{1}')",
"INSERT INTO t_student(studentName,studentId,classId,studentAge,studentSex)Values('{0}','{1}','{2}','{3}','{4}')" ,
"SELECT * FROM t_class",
"select * from t_student where classId='{0}'",
"select * from t_student s,t_class c where c.classId=s.classId",
"update t_class set {0} where classId='{1}'",
"update t_student set {0} where studentId='{1}'",
"delete from t_class where classId='{0}'",
"delete from t_student where studentId='{0}'"
};
private ObjectQuey sqlite ;
public OperateSq()
{
sqlite = new ObjectQuey("tkinfo.db");
}
/// <summary>
/// 读取班级
/// </summary>
/// <param name="q"></param>
/// <returns></returns>
public List<ClassA> ReadClaSqlite(Quey q)
{
return sqlite.SelsetTable<ClassA>(opear[((int)q)]);
}
/// <summary>
/// 读取学生
/// </summary>
/// <param name="q"></param>
/// <param name="s"></param>
/// <returns></returns>
public List<Student> ReadStuSqlite(Quey q)
{
MainWindow main = App.Current.MainWindow as MainWindow;
ClassA selectUser = (ClassA)main.classDate.SelectedItem;
if (selectUser != null)
return sqlite.SelsetTable<Student>(string.Format(opear[((int)q)], selectUser.classId.ToString()));
else
return null;
}
/// <summary>
/// 查询信息
/// </summary>
/// <returns></returns>
public List<AllInfo> ReadAllSqlite()
{
return sqlite.SelsetTable<AllInfo>(AddString());
}
/// <summary>
/// 写入新数据
/// 修改数据
/// 删除数据
/// </summary>
/// <param name="q"></param>
/// <param name="str"></param>
/// <returns></returns>
public bool WriteSqlite(Quey q)
{
MainWindow main = App.Current.MainWindow as MainWindow;
ClassA selectUser = (ClassA)main.classDate.SelectedItem;
Student selectUserStu = (Student)main.studentDate.SelectedItem;
//string[] cla = { main.classId.Text, main.className.Text, main.classKh.Text };
string[] cla = { main.className.Text, main.classKh.Text };
string[] stu=null;
if (selectUser != null)
{
stu =new string[]{ main.studentName.Text, main.studentId.Text, selectUser.classId.ToString(), main.studentAge.Text, main.studentSex.Text };
}
try
{
if ((int)q==0)//插入班级数据
sqlite.SqInsDel(string.Format(opear[((int)q)], cla));
else if ((int)q == 1 && stu!=null)//插入学生
sqlite.SqInsDel(string.Format(opear[((int)q)], stu));
else if ((int)q == 5 && cla != null && selectUser != null)//修改班级
{
if (cla[0].Trim()!="")
cla[0] = "className=" "'" cla[0].Trim() "'";
if (cla[0].Trim() != "")
cla[1] = ",classSlogan=" "'" cla[1].Trim() "'";
String ms = cla[0] cla[1];
sqlite.SqInsDel(string.Format(opear[((int)q)], new string[] { ms, selectUser.classId.ToString() }));
}
else if ((int)q == 6 && stu != null && selectUserStu!=null)//修改学生
{
if (stu[0].Trim() != "")
stu[0] = "studentName=" "'" stu[0].Trim() "'";
//if (stu[1].Trim() != "")
// stu[1] = ",studentId=" "'" stu[1].Trim() "'";
if (stu[3].Trim() != "")
stu[3] = ",studentAge=" "'" stu[3].Trim() "'";
if (stu[4].Trim() != "")
stu[4] = ",studentSex=" "'" stu[4].Trim() "'";
String ms = stu[0] stu[3] stu[4];
sqlite.SqInsDel(string.Format(opear[((int)q)], new string[] { ms, selectUserStu .studentId.ToString()}));
}
else if ((int)q == 7 && selectUser != null)//删除班级
{
foreach (Student dr in ReadStuSqlite(Quey.ReadStudent))
{
sqlite.SqInsDel(string.Format(opear[(int)Quey.DelStudent], dr.studentId));
}
sqlite.SqInsDel(string.Format(opear[((int)q)], selectUser.classId));
}
else if ((int)q == 8 && selectUserStu != null)//删除班级
{
sqlite.SqInsDel(string.Format(opear[((int)q)],selectUserStu.studentId));
}
return true;
}
catch
{
return false;
}
}
public string AddString()
{
MainWindow main = App.Current.MainWindow as MainWindow;
StringBuilder str = new StringBuilder();
str.Append(opear[(int)Quey.SemandInfo]);
//if (main.classId.Text.Trim() != "")
// str.Append(" and c.classId=" "'" main.classId.Text.Trim() "'");
if (main.classKh.Text.Trim() != "")
str.Append(" and c.classSlogan=" "'" main.classKh.Text.Trim() "'");
if (main.className.Text.Trim() != "")
str.Append(" and c.className=" "'" main.className.Text.Trim() "'");
if (main.studentName.Text.Trim() != "")
str.Append(" and s.studentName=" "'" main.studentName.Text.Trim() "'");
if (main.studentId.Text.Trim() != "")
str.Append(" and s.studentId=" "'" main.studentId.Text.Trim() "'");
if (main.studentAge.Text.Trim() != "")
str.Append(" and s.studentAge=" "'" main.studentAge.Text.Trim() "'");
if (main.studentSex.Text.Trim() != "")
str.Append(" and s.studentSex=" "'" main.studentSex.Text.Trim() "'");
return str.ToString();
}
}
/// <summary>
/// 操作数据库可选项
/// </summary>
public enum Quey
{ /// <summary>
/// 添加学生
/// </summary>
AddStudent = 1,
/// <summary>
/// 添加班级
/// </summary>
AddClass = 0,
/// <summary>
/// 读取学生
/// </summary>
ReadStudent=3,
/// <summary>
/// 读取班级
/// </summary>
ReadClass=2,
/// <summary>
/// 查询数据
/// </summary>
SemandInfo=4,
/// <summary>
/// 修改班级
/// </summary>
UpdateClass = 5,
/// <summary>
/// 修改学生
/// </summary>
UpdateStudent = 6,
/// <summary>
/// 删除班级
/// </summary>
DelClass = 7,
/// <summary>
/// 删除学生
/// </summary>
DelStudent = 8,
}
}
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