展示医院科室的下拉列表（连接数据库数据）

使用android连接数据库 （1）

第一次在csdn写博客，记录下在学习过程遇到的问题，好好总结，以便以后的学习。好，说来就来，那就来写第一篇文章，可能排版不太好看咯。

1. 创建数据库, 在这里我创建了两个表

表BigDepartment(大科)

DBigDepart	DBID
内科	N

表Department（具体科室）

DID	DName	DBDID
N01	心血管科	N

DBDID映射到BigDepartment表中的DBID，从而就可以拿到大科的名称，所以在这里设置了外键。

为什么要设置两个表呢？

因为如果设置一个表的时候，数据如下表所示

DID	DName	DBDID	DBigDepart
N01	心血管科	N	内科
N02	肠胃科	N	内科
N03	呼吸科	N	内科

由此，发现了，一个表中N与内科的对应关系写入数据库多次，数据发生冗余，浪费存储空间，有可能还会使查询数据库效率变慢。

如果呼吸科下面还有呼吸一科、呼吸二科的话，就再建立一个表，设置外键即可

DID	DSName	DSID
N03	呼吸一科	N0101

2.数据库的代码

CREATE DATABASE Department_DataBase;
USE Department_DataBase;
CREATE TABLE Department(
DID VARCHAR(10),
DName VARCHAR(20) NOT NULL,
DBDID VARCHAR(10),
PRIMARY KEY(DID),
FOREIGN KEY(DBDID) REFERENCES BigDepartment(DBID)
);

CREATE TABLE BigDepartment(
DBigDepart VARCHAR(10) NOT NULL,
DBID VARCHAR(10),
PRIMARY KEY(DBID),
);

INSERT INTO BigDepartment(DBigDepart,DBID)
VALUES("N","内科");
INSERT INTO BigDepartment(DBigDepart,DBID)
VALUES("F","妇产科");
INSERT INTO BigDepartment(DBigDepart,DBID)
VALUES("G","骨科");
INSERT INTO BigDepartment(DBigDepart,DBID)
VALUES("Z","肿瘤科");
INSERT INTO BigDepartment(DBigDepart,DBID)
VALUES("W","外科");
INSERT INTO BigDepartment(DBigDepart,DBID)
VALUES("S","辅助部门");

INSERT INTO Department(DID,DName,DBDID)
VALUES("N01","心血管科","N");
INSERT INTO Department(DID,DName,DBDID)
VALUES("N02","脾胃病科","N");
INSERT INTO Department(DID,DName,DBDID)
VALUES("N03","肾病科","N");
INSERT INTO Department(DID,DName,DBDID)
VALUES("N04","脑病科","N");
INSERT INTO Department(DID,DName,DBDID)
VALUES("N05","呼吸科","N");
INSERT INTO Department(DID,DName,DBDID)
VALUES("N06","内分泌科","N");
INSERT INTO Department(DID,DName,DBDID)
VALUES("N07","血液科","N");
INSERT INTO Department(DID,DName,DBDID)
VALUES("N08","风湿病科","N");
INSERT INTO Department(DID,DName,DBDID)
VALUES("N09","重症医学科","N");
INSERT INTO Department(DID,DName,DBDID)
VALUES("N10","综合科","N");
INSERT INTO Department(DID,DName,DBDID)
VALUES("N11","急诊科","N");

INSERT INTO Department(DID,DName,DBDID)
VALUES("F01","一妇科","F");
INSERT INTO Department(DID,DName,DBDID)
VALUES("F02","二妇科","F");
INSERT INTO Department(DID,DName,DBDID)
VALUES("F03","产 科","F");
INSERT INTO Department(DID,DName,DBDID)
VALUES("F04","新生儿科","F");

INSERT INTO Department(DID,DName,DBDID)
VALUES("G01","一骨科","G");
INSERT INTO Department(DID,DName,DBDID)
VALUES("G02","二骨科","G");
INSERT INTO Department(DID,DName,DBDID)
VALUES("G03","三骨科","G");
INSERT INTO Department(DID,DName,DBDID)
VALUES("G04","四骨科","G");

INSERT INTO Department(DID,DName,DBDID)
VALUES("Z01","一肿瘤科","Z");
INSERT INTO Department(DID,DName,DBDID)
VALUES("Z02","二肿瘤科","Z");
INSERT INTO Department(DID,DName,DBDID)
VALUES("Z03","三肿瘤科","Z");
INSERT INTO Department(DID,DName,DBDID)
VALUES("Z04","四肿瘤科","Z");

INSERT INTO Department(DID,DName,DBDID)
VALUES("W01","一外科","W");
INSERT INTO Department(DID,DName,DBDID)
VALUES("W02","二外科","W");
INSERT INTO Department(DID,DName,DBDID)
VALUES("W03","三外科","W");
INSERT INTO Department(DID,DName,DBDID)
VALUES("W04","四外科","W");
INSERT INTO Department(DID,DName,DBDID)
VALUES("W05","肛肠科","W");
INSERT INTO Department(DID,DName,DBDID)
VALUES("W06","乳腺科","W");
INSERT INTO Department(DID,DName,DBDID)
VALUES("W07","颅脑科","W");
INSERT INTO Department(DID,DName,DBDID)
VALUES("W08","皮肤科","W");
INSERT INTO Department(DID,DName,DBDID)
VALUES("W09","针灸科","W");
INSERT INTO Department(DID,DName,DBDID)
VALUES("W10","推拿科","W");
INSERT INTO Department(DID,DName,DBDID)
VALUES("W11","儿科","W");
INSERT INTO Department(DID,DName,DBDID)
VALUES("W12","护理部","W");
INSERT INTO Department(DID,DName,DBDID)
VALUES("W13","麻醉科","W");
INSERT INTO Department(DID,DName,DBDID)
VALUES("W14","口腔科","W");
INSERT INTO Department(DID,DName,DBDID)
VALUES("W15","耳鼻喉科","W");
INSERT INTO Department(DID,DName,DBDID)
VALUES("W16","药学部","W");
INSERT INTO Department(DID,DName,DBDID)
VALUES("W17","眼科","W");

INSERT INTO Department(DID,DName,DBDID)
VALUES("S01","医技科","S");
INSERT INTO Department(DID,DName,DBDID)
VALUES("S02","影像科","S");
INSERT INTO Department(DID,DName,DBDID)
VALUES("S03","检验科","S");
INSERT INTO Department(DID,DName,DBDID)
VALUES("S04","实验中心","S");
INSERT INTO Department(DID,DName,DBDID)
VALUES("S05","消化内镜室","S");

好了，把它丢进去mysql运行即可，数据库建立完成，接下来就是测试数据了。