From 7857e30487a675bd3a31f0d111e197137650fe7d Mon Sep 17 00:00:00 2001 From: lisiqidaer <506358560@qq.com> Date: Thu, 8 Jul 2021 16:03:19 +0800 Subject: [PATCH] DatabaseHelper --- .../DatabaseHelper/CourseSQLHelper.java | 33 +++++++++ .../DatabaseHelper/ScheduleSQLHelper.java | 39 +++++++++++ .../showme/database/utils/CourseSQLUtils.java | 10 +++ .../database/utils/ScheduleSQLUtils.java | 69 +++++++++++++++++++ 4 files changed, 151 insertions(+) create mode 100644 ShowMe/src/DataBase/src/main/java/com/showme/database/DatabaseHelper/CourseSQLHelper.java create mode 100644 ShowMe/src/DataBase/src/main/java/com/showme/database/DatabaseHelper/ScheduleSQLHelper.java create mode 100644 ShowMe/src/DataBase/src/main/java/com/showme/database/utils/CourseSQLUtils.java create mode 100644 ShowMe/src/DataBase/src/main/java/com/showme/database/utils/ScheduleSQLUtils.java diff --git a/ShowMe/src/DataBase/src/main/java/com/showme/database/DatabaseHelper/CourseSQLHelper.java b/ShowMe/src/DataBase/src/main/java/com/showme/database/DatabaseHelper/CourseSQLHelper.java new file mode 100644 index 0000000..0cb3208 --- /dev/null +++ b/ShowMe/src/DataBase/src/main/java/com/showme/database/DatabaseHelper/CourseSQLHelper.java @@ -0,0 +1,33 @@ +package com.showme.database.DatabaseHelper; + +import android.content.Context; +import android.database.sqlite.SQLiteDatabase; +import android.database.sqlite.SQLiteOpenHelper; + +public class CourseSQLHelper extends SQLiteOpenHelper { + private static final String db_name = "course";//自定义的数据库名； + private static final int version = 2;//版本号 + + public CourseSQLHelper(Context context) { + super(context, db_name, null, version); + } + + @Override + public void onCreate(SQLiteDatabase db) { + db.execSQL("create table courses(" + + "id integer primary key autoincrement," + + "course_name text," + + "teacher text," + + "class_room text," + + "day integer," + + "class_start integer," + + "class_end integer," + + "weeks text)"); + } + + @Override + public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { + db.execSQL("drop table if exists schedules"); + onCreate(db); + } +} \ No newline at end of file diff --git a/ShowMe/src/DataBase/src/main/java/com/showme/database/DatabaseHelper/ScheduleSQLHelper.java b/ShowMe/src/DataBase/src/main/java/com/showme/database/DatabaseHelper/ScheduleSQLHelper.java new file mode 100644 index 0000000..5675034 --- /dev/null +++ b/ShowMe/src/DataBase/src/main/java/com/showme/database/DatabaseHelper/ScheduleSQLHelper.java @@ -0,0 +1,39 @@ +package com.showme.database.DatabaseHelper; + +import android.content.Context; +import android.database.sqlite.SQLiteDatabase; +import android.database.sqlite.SQLiteOpenHelper; + +public class ScheduleSQLHelper extends SQLiteOpenHelper { + private static final String db_name = "MySchedule";//自定义的数据库名； + private static final int version = 98889;//版本号 + + public ScheduleSQLHelper(Context context) { + super(context, db_name, null, version); + } + + // 该方法会自动调用，首先系统会检查该程序中是否存在数据库名为‘MySchedule’的数据库 + // 如果存在则不会执行该方法，如果不存在则会执行该方法。 + @Override + public void onCreate(SQLiteDatabase db) { + String sql = "create table schedules(" + + "id Integer primary key autoincrement," + //id自增,只支持integer不支持int + "scheduleName varchar(50)," + + "schedulePlace varchar(50)," + + "ifSchedulePlace integer," + + "startTime varchar(50)," + + "ifStartTime integer," + + "endTime varchar(50)," + + "ifEndTime interger," + + "time varchar(30)" + + ")"; + db.execSQL(sql); + } + + //数据库版本更新时执行该方法,如果表已存在则先删除再调用onCreate重新创建 + @Override + public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { + db.execSQL("drop table if exists schedules"); + onCreate(db); + } +} diff --git a/ShowMe/src/DataBase/src/main/java/com/showme/database/utils/CourseSQLUtils.java b/ShowMe/src/DataBase/src/main/java/com/showme/database/utils/CourseSQLUtils.java new file mode 100644 index 0000000..2dbedd6 --- /dev/null +++ b/ShowMe/src/DataBase/src/main/java/com/showme/database/utils/CourseSQLUtils.java @@ -0,0 +1,10 @@ +package com.showme.database.utils; + +import android.database.sqlite.SQLiteDatabase; + +import com.showme.database.MySQLiteDatabase; + +public class CourseSQLUtils { + private static SQLiteDatabase courseSQL = MySQLiteDatabase.courseSQL; + +} diff --git a/ShowMe/src/DataBase/src/main/java/com/showme/database/utils/ScheduleSQLUtils.java b/ShowMe/src/DataBase/src/main/java/com/showme/database/utils/ScheduleSQLUtils.java new file mode 100644 index 0000000..1be1168 --- /dev/null +++ b/ShowMe/src/DataBase/src/main/java/com/showme/database/utils/ScheduleSQLUtils.java @@ -0,0 +1,69 @@ +package com.showme.database.utils; + +import android.database.Cursor; +import android.database.sqlite.SQLiteDatabase; + +import com.showme.database.MySQLiteDatabase; + +import java.util.ArrayList; +import java.util.List; + +public class ScheduleSQLUtils { + private static SQLiteDatabase database = MySQLiteDatabase.scheduleSQL; + + public static List queryByDate(String date) { + //columns为null 查询所有列 + List res = new ArrayList<>(); + String aScheduleName; + Cursor cursor = database.query("schedules",null,"time=?",new String[]{date},null,null,null); + if(cursor.moveToFirst()){ + int scheduleCount = 0; + do{ + aScheduleName = cursor.getString(cursor.getColumnIndex("scheduleName")); + String aStartTime = cursor.getString(cursor.getColumnIndex("startTime")); + Integer ifStartTime = cursor.getInt(cursor.getColumnIndex("ifStartTime")); + String aEndTime = cursor.getString(cursor.getColumnIndex("endTime")); + Integer ifEndTime = cursor.getInt(cursor.getColumnIndex("ifEndTime")); + String scheduleText = aScheduleName; + + if(ifStartTime == 1){ + scheduleText += "($时间:"+aStartTime; + + if(ifEndTime ==1){ + scheduleText += "\n"+aEndTime; + } else { + scheduleText += "\n24:00"; + } + } else { + scheduleText += "($时间: 00:00\n24:00"; + } + + scheduleCount++; + res.add(scheduleText); + }while (cursor.moveToNext()); + } + cursor.close(); + return res; + } + + public static String extractScheduleName(String scheduleText) { + int index = scheduleText.indexOf("($时间:"); + if (index != -1) { + return scheduleText.substring(0, index); + } + return null; + } + + public static String extractScheduleTime(String scheduleText) { + int index = scheduleText.indexOf("($时间:"); + if (index != -1) { + return scheduleText.substring(index+5); + } + return null; + } + + public static boolean isScheduleMarked(String date) { + Cursor cursor = database.query("schedules",null,"time=?",new String[]{date},null,null,null); + return cursor.moveToFirst(); + } +}