SQLite查询相关范围内的日期

Question

我正在使用android studio和SQLite。我在SQLite中设置了处方表，并使用TEXT类型作为开始日期和结束日期。查询此数据时，我不太确定TEXT是否是适当的数据类型。我想显示开始日期在当前日期之前或等于当前日期，而结束日期在当前日期之前或等于当前日期的记录。下面的代码来自我的DatabaseHelper.java类；

 //Create prescription table
    public static final String TABLE_PRESCRIPTION = "prescription_table";
    public static final String COL_PRESCRIPTION_ID = "PRESCRIPTIONID";
    public static final String COL_PRESCRIPTION__PATIENTID = COL_PATIENT_PATIENTID;
    public static final String COL_PRESCRIPTION__DATE = "DATE";
    public static final String COL_PRESCRIPTION__DRUGNAME = "DRUGNAME";
    public static final String COL_PRESCRIPTION__CONCENTRATION = "CONCENTRATION";
    public static final String COL_PRESCRIPTION__DOSAGE = "DOSAGE";
    public static final String COL_PRESCRIPTION__PREPARATION = "PREPARATION";
    public static final String COL_PRESCRIPTION__STARTDATE = "STARTDATE";
    public static final String COL_PRESCRIPTION__ENDDATE = "ENDDATE";
    public static final String COL_PRESCRIPTION__DOCTORID = "DOCTORID";

public void onCreate (SQLiteDatabase db) {
 String prescriptiontable = "CREATE TABLE " + TABLE_PRESCRIPTION + "(PRESCRIPTIONID INTEGER PRIMARY KEY AUTOINCREMENT, PATIENTID INTEGER, DATE TEXT, DRUGNAME TEXT, CONCENTRATION TEXT, DOSAGE TEXT, PREPARATION TEXT, STARTDATE TEXT, ENDDATE TEXT, DOCTORID INTEGER)";
        //execute SQL statements
        db.execSQL(prescriptiontable);
}

 public Cursor getPrescriptionsPerPatient(String patientid){
        SQLiteDatabase db = this.getReadableDatabase();
        //SQL select statement
        Cursor data = db.rawQuery("SELECT * FROM prescription_table WHERE PATIENTID =? AND strftime('%d/%m/%Y',date('now') BETWEEN " +
                        "STARTDATE AND ENDDATE)",
                new String[]{patientid});
        return data;
    }

错误在getPrescriptionsPerPatient（）方法内。任何帮助，将不胜感激！谢谢

Answer 1

假设您将日期存储在one of the formats supported by SQLite中（通常为YYYY-MM-DD），则可以执行以下操作：

SELECT * 
FROM prescription_table 
WHERE 
    patientid = ? 
    AND date('now') BETWEEN startdate AND enddate