数据库基本增删改查

sql语句如果不经常用如果突然要写一条sql, 可能会花一些时间在网上找, 而在网上找真的有点儿太浪费时间, 有这时间又可以去学习自己陌生的领域, 虽然有w3school, 但是也不太全. 题外话, 总感觉sql和多线程是Android开发者的硬伤;
demo已提交github

1. 建表:

@Override
public void onCreate(SQLiteDatabase db) {
     String sql = "create table Test("
                + "_id integer primary key autoincrement,"
                + "ParamA text,"
                + "ParamB varchar(20),"
                + "ParamC varchar(20))";
        db.execSQL(sql);
}

2. 插入操作:

1. 方式一(insert):
2. 方式二(execSQL):

• 1. 方式一(insert):

public void addByInsert(ParamsEngine engine) {
    SQLiteDatabase database = mHelper.getWritableDatabase();
    ContentValues values = new ContentValues();
    values.put("ParamA", engine.mParamA);
    values.put("ParamB", engine.mParamB);
    values.put("ParamC", engine.mParamC);
    database.insert("Test", null, values);
}

• 2. 方式二(execSQL):

(1)
insert into Test(ParamA, ParamB, ParamC) values (?,?,?)
public void addByExecSQLAndRes(ParamsEngine engine) {
    SQLiteDatabase database = mHelper.getWritableDatabase();
    String sql = ComponentUtils.getContext().getString(R.string.addByExecSQL);
    String[] bingArgs = new String[]{engine.mParamA, engine.mParamB, engine.mParamC};
    database.execSQL(sql, bingArgs);
}
(2)
public void addByExecSQL(ParamsEngine engine) {
    SQLiteDatabase database = mHelper.getWritableDatabase();
    String sql = "insert into Test(ParamA, ParamB, ParamC) values (?,?,?)";
    String[] bingArgs = new String[]{engine.mParamA, engine.mParamB, engine.mParamC};
    database.execSQL(sql, bingArgs);
}

3. 删除操作:

1. DELETE FROM TableContainer WHERE ParamA IN ("paramA");

4. 查找:

1. in限定符查找:

select count(*) from TableContainer where ParamA in ("ParamA_1","ParamA_3","ParamA_5")    
select ParamC from TableContainer where ParamA in ("ParamA_1","ParamA_3","ParamA_5") and ParamB in ("ParamB_3")
select * from TableContainer where ParamA in ("ParamA_1","ParamA_3","ParamA_5") and ParamB in ("ParamB_3")

2. 分页查询:
 http://blog.csdn.net/lu1024188315/article/details/51734514

3. join:
 sqlite不支持右连接和外连接:

左连接:
select * from tableA a left join tableB b on a.aId = b.bId;
以左表A为基础;

TableA

TableB

左连接查询结果