android中sqlite数据库的基本使用和添加多张表

看了很多关于android使用sqlite数据库的文章，很多都是介绍了数据库的建立和表的建立，而表通常都是只建立一张，而实际情况我们用到的表可能不止一张，那这种情况下我们又该怎么办呢，好了，下面我教大家如何在sqlite数据库中建立多张表。

首先是如何建立数据库和表：

建立一个类继承SQLiteOpenHelper，即：

public class ReaderOpenHelper extends SQLiteOpenHelper

然后添加构造方法：

public ReaderOpenHelper(Context context) {

        

        super(context, "people.db", null, 1);

        

    }

people.db是数据库名字，1是数据库版本。

然后在该类实现以下两个方法：

@Override

    public void onCreate(SQLiteDatabase db) {

        // TODO Auto-generated method stub

     db.execSQL("create table readers(renumber integer primary key,rename text,retype text,reage text,rephone text,usename integer,password integer,createtime text)");

     db.execSQL("create table books(booknumber integer primary key,bookname text,booktype text,bookeditor text,intime text,incounts integer)");

    }

db.execSQL的作用是执行SQL语句，create table readers是创建一个叫readers的表，括号里就是各个字段名和值类型。

这里创建了两张表。另一张叫books

继续实现：

@Override

    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

        // TODO Auto-generated method stub

        db.execSQL("drop if table exists readers");

        db.execSQL("drop if table exists  books");

        onCreate(db);

    }

执行Sql语句"drop if table exists 表名"

这样你的sqlite数据库和两张表就创建完成了。

接下来再建一个数据库manager类，如：

public class ReaderManager 

添加一个构造方法

public ReaderManager(Context conetxt) {

        this.context = context;

        readerOpenHelper = new ReaderOpenHelper(conetxt);

    }

然后添加表的操作方法：

package com.zhou.db;



import java.util.ArrayList;

import java.util.List;



import com.zhou.utils.Books;

import com.zhou.utils.Reader;



import android.content.ContentValues;

import android.content.Context;

import android.database.Cursor;

import android.database.sqlite.SQLiteDatabase;

import android.util.Log;



public class ReaderManager {

    ReaderOpenHelper readerOpenHelper;

    Context context;



    public ReaderManager(Context conetxt) {

        this.context = context;

        readerOpenHelper = new ReaderOpenHelper(conetxt);

    }



    // 增加读者

    public void addSQL(Reader reader) {

        SQLiteDatabase db = null;

        try {

            db = readerOpenHelper.getWritableDatabase();

            ContentValues values = new ContentValues();

            values.put("renumber", reader.getReNumber());

            values.put("rename", reader.getName());

            values.put("retype", reader.getSex());

            values.put("reage", reader.getAge());

            values.put("rephone", reader.getPhoneNumber());

            values.put("createtime", reader.getCreateTime());

            values.put("usename", reader.getUseName());

            values.put("password", reader.getPassword());

            db.insert("readers", null, values);

        } catch (Exception e) {

            // TODO: handle exception

        } finally {

            db.close();

        }

    }



    // 增加图书

    public void bookAddSQL(Books book) {

        SQLiteDatabase db = null;

        try {

            db = readerOpenHelper.getWritableDatabase();

            ContentValues values = new ContentValues();

            values.put("booknumber", book.getBookNumber());

            values.put("bookname", book.getBookName());

            values.put("booktype", book.getBookType());

            values.put("bookeditor", book.getBookEditer());

            values.put("intime", book.getInTime());

            values.put("incounts", book.getCount());

            db.insert("books", null, values);

        } catch (Exception e) {

            // TODO: handle exception

        } finally {

            db.close();

        }

    }



    // 读者查询

    public List<Reader> selectSQL() {

        List<Reader> list = new ArrayList<Reader>();

        SQLiteDatabase db = null;

        // 获取一个光标对象

        Cursor cursor = null;

        try {

            db = readerOpenHelper.getReadableDatabase();

            cursor = db.query("readers", null, null, null, null, null, null);

            Reader reader = null;

            while (cursor.moveToNext()) {

                reader = new Reader();

                reader.setReNumber(cursor.getInt(cursor

                        .getColumnIndex("renumber")));



                reader.setName(cursor.getString(cursor.getColumnIndex("rename")));

                reader.setSex(cursor.getString(cursor.getColumnIndex("retype")));

                reader.setAge(cursor.getString(cursor.getColumnIndex("reage")));

                reader.setPhoneNumber(cursor.getString(cursor

                        .getColumnIndex("rephone")));

                reader.setCreateTime(cursor.getString(cursor

                        .getColumnIndex("createtime")));

                reader.setUseName(cursor.getInt(cursor

                        .getColumnIndex("usename")));

                reader.setPassword(cursor.getInt(cursor

                        .getColumnIndex("password")));

                list.add(reader);

            }

        } catch (Exception e) {

            // TODO: handle exception

        } finally {

            cursor.close();

            db.close();

        }



        return list;

    }



    // 图书查询

    public List<Books> bookSelectSQL() {

        List<Books> list = new ArrayList<Books>();

        SQLiteDatabase db = null;

        // 获取一个光标对象

        Cursor cursor = null;

        try {

            db = readerOpenHelper.getReadableDatabase();

            cursor = db.query("books", null, null, null, null, null, null);

            Books book = null;

            while (cursor.moveToNext()) {

                book = new Books();

                book.setBookNumber(cursor.getInt(cursor

                        .getColumnIndex("booknumber")));

                book.setBookName(cursor.getString(cursor

                        .getColumnIndex("bookname")));

                book.setBookType(cursor.getString(cursor

                        .getColumnIndex("booktype")));

                book.setBookEditer(cursor.getString(cursor

                        .getColumnIndex("bookeditor")));

                book.setInTime(cursor.getString(cursor.getColumnIndex("intime")));

                book.setCount(cursor.getInt(cursor.getColumnIndex("incounts")));

                Log.d("TAGG", cursor.getString(cursor.getColumnIndex("intime")));

                list.add(book);

            }

        } catch (Exception e) {

            // TODO: handle exception

        } finally {

            cursor.close();

            db.close();

        }



        return list;

    }



    // 读者删除

    public void deleteSQL(final long id) {

        SQLiteDatabase db = null;

        try {

            db = readerOpenHelper.getWritableDatabase();

            db.delete("readers", "renumber=" + id, null);

        } catch (Exception e) {



        } finally {

            db.close();

        }

    }



    // 读者更新



    public void updateData(int id, String name, String sex, String age,

            String phoneNumber, int password) {



        SQLiteDatabase db = null;

        try {

            db = readerOpenHelper.getWritableDatabase();

            ContentValues values = new ContentValues();

            values.put("rename", name);

            values.put("retype", sex);

            values.put("reage", age);

            values.put("rephone", phoneNumber);

            values.put("password", password);

            db.update("readers", values, "renumber=" + id, null);

        } catch (Exception e) {

            // TODO: handle exception

        } finally {

            db.close();

        }



    }



    // public long getCount() {

    //

    // Cursor cursor = null;

    // long count = 0;

    // SQLiteDatabase db = null;

    // try {

    // db = readerOpenHelper.getWritableDatabase();

    // cursor = db.query("readers", null, null, null, null, null, null);

    //

    // if (null != cursor) {

    // count = cursor.getCount();

    // cursor.close();

    // }

    // } catch (Exception e) {

    // } finally {

    // db.close();

    // }

    // return count;

    // }



}

添加多张表的sqlite数据基本上就是这样实现的，谢谢！