Design and implementation of database for banking system

The design and implementation of the database of banking system

1. Create database banking system database ---bankDB

Drop database if EXISTS bankDB; # Delete bindDB database , There is no error even if there is no database 
CREATE database bankDB;# Create database 

2. Create customer table ---userInfo

Field name	data type	meaning	explain
customerID	int	Customer number	Auto increment , from 1 Start , Primary key
customerName	varchar	Account name	Required
PID	char	ID number	Required , Can only be 18 position , Unique constraint
telephone	varchar	contact number	Required , The format is fixed telephone or mobile phone number
address	varchar	Residential address	Optional input

use bankDB;# Using a database 
drop table  if exists userInfo;# Delete userInfo Data sheet , No error even if there is no data table 
create table userInfo  # establish userInfo Data sheet --- Customer list 
(  
customerID int auto_increment PRIMARY key,  # Customer number , Auto increment , from 1 Start , Primary key 
customerName varchar(20) not null, # Account name , Required but not blank 
PID CHAR(18) NOT NULL, # ID number , Required but not blank 
telephone varchar(15) not null, # Phone number , Required but not blank 
address varchar(50) # Address , Can be null 
);
alter table userInfo add CONSTRAINT UQ_PID UNIQUE(PID);  
# to userInfo Tabular PID Add a unique constraint 
desc userInfo; # View the table structure of the data table 

3. Create a bank card table ---cardInfo

Field name	data type	meaning	explain
cardID	char	Card number	Required , Primary key .
curID	varchar	Type of currency	Foreign keys , Required , The default is RMB
savingID	tinyint	Type of deposit	Foreign keys , Required
openDate	datetime	Account opening date	Required , It defaults to the current system date and time
openMoney	double	Account balance	Required
balance	double	balance	Required
password	char	password	Required ,6 Digit number , When opening an account, it defaults to 6 individual 8
isReportLoss	char	Whether to report the loss	Required , yes / no , The default value is no
customerID	int	Customer number	Foreign keys , Required

drop table  if exists cardInfo;# Delete cardInfo Data sheet , No error even if there is no data table 
create table cardInfo   # establish cardInfo Data sheet --- Bank card form 
( 
cardID char(19) not null, # Card number , Required but not blank 
curID varchar(10) not null,# Type of currency , Required but not blank 
savingID int not null, # Type of deposit , Required but not blank 
openDate Datetime not null,# Account opening date , Required but not blank 
openMoney DOUBLE not null,# The amount of the account , Required but not blank 
balance DOUBLE not null,# balance , Required but not blank 
password char(6) not null,# password ,6 Digit number , When opening an account, it defaults to 6 individual 8, Required but not blank 
isReportLoss char(1) not null,# Whether to report the loss , yes / no , The default value is no , Required but not blank 
customerID int not null# Customer number , Foreign keys .
);
desc cardInfo;

4. Create a transaction table

Field name	data type	meaning	explain
tradeDate	datetime	Transaction date	Required , It defaults to the current system date and time
cardID	varchar	Card number	Foreign keys , Required
tradeType	char	Type of transaction	Required , Only deposit / draw
tradeMoney	double	Transaction amount	Required , Greater than 0
machine	char	Terminal number	The machine number of the customer's business operation

drop table  if exists tradeInfo;# Delete tradeInfo Data sheet , No error even if there is no data table 
create table tradeInfo # establish tradeInfo Data sheet --- Deal sheet 
( 
tradeDate datetime not null,# Transaction date , Required , It defaults to the current system date and time 
tradeType enum(" Deposit in "," spending ") not null,# Type of transaction , Required but not blank , Only deposit / draw 
cardID char(19) not null, # Card number , Foreign keys , Required but not blank 
tradeMoney DOUBLE not null,# Transaction amount , Required but not blank , Default >0
machine char(8) not null# Terminal number , The default value is not empty 
);
desc tradeInfo;

5. Deposit type table structure

Field name	data type	meaning	explain
savingID	tinyint	Deposit type number	Auto increment , from 1 Start , Primary key
savingName	varchar	Deposit type name	Required
descript	varchar	describe	Can be empty

drop table  if exists deposit;# Delete deposit Data sheet , No error even if there is no data table 
create table deposit   # establish deposit Data sheet ---> Deposit type table 
(  
savingID INT AUTO_INCREMENT PRIMARY KEY, # Deposit type number , Auto increment from 1 Start , Primary key 
savingName varchar(20) not null,# Deposit type name , Required but not blank 
descript varchar(50)# describe 
);
desc deposit;

6. to cardInfo Add constraints to the table

alter table cardInfo add CONSTRAINT PK_cardID PRIMARY key(cardID);
​
# to cardID Add a primary key constraint 
​
alter table cardInfo ALTER curID SET DEFAULT "RMB";
​
# to curID Set a default option to RMB
​
alter table cardInfo MODIFY COLUMN openDate DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP;
​
# The account opening date is set to the current system time by default 
​
alter table cardInfo ALTER password SET DEFAULT "888888";
​
# to password Set a default option to 888888
​
alter table cardInfo alter isReportLoss SET DEFAULT 0;
​
# to isReportLoss Set the default option to 0.1 be for the purpose of ,0 Why not 
​
alter table cardInfo add CONSTRAINT FK_customerID FOREIGN key(customerID) REFERENCES userInfo(customerID);
​
# Set up foreign keys ,cardInfo by userInfo Subordinate table of ,customerID Reference is userInfo Customer number of the table 
​
alter table cardInfo add CONSTRAINT FK_savingID FOREIGN key(savingID) REFERENCES deposit(savingID); 
​
# Set up foreign keys ,cardInfo by userInfo Subordinate table of ,savingID Reference is userInfo Deposit type no. of the table 
​
desc cardInfo;

7. to tradeInfo Add constraints to the table

alter table tradeInfo add CONSTRAINT PK_cardID_tradeInfo PRIMARY key(cardID,tradeDate);
​
# stay tardeInfo Set... In the table cardID,tradeDate For union primary key 
​
alter table tradeInfo add CONSTRAINT FK_cardID FOREIGN key(cardID) REFERENCES cardInfo(cardID);
​
# Set up foreign keys ,tradeInfo by cardInfo Subordinate table of ,cardID Reference resources cardInfo Your card number 
​
alter table tradeInfo MODIFY COLUMN tradeDate datetime not null DEFAULT CURRENT_TIMESTAMP;
​
# Set up tradeInfo The transaction date of the table is a non empty constraint , The default is the current system date 
​
alter table tradeInfo modify machine char(8) DEFAULT 1;
​
# Set the terminal number to... By default 1
​
create index IX_cardID on tradeInfo(cardID);
​
# stay tradeInfo Use on the table create index  Statement to create an index named IX_card
# Grammatical structure ：create [unique( unique index )] [fulltext( Full-text index )] [spatial( Spatial index )] index  Index name  on  Table name ( Field name [( length )][asc|desc][,....]);

8. Insert data into the deposit type table

insert into deposit(savingName,descript) VALUES (' current ',' Interest shall be settled on the deposit date ');
insert into deposit(savingName,descript) VALUES (' Regular for one year ',' The deposit period is one year ');
insert into deposit(savingName,descript) VALUES (' Regular for two years ',' The deposit period is two years ');
insert into deposit(savingName,descript) VALUES (' Regular for three years ',' The deposit period is three years ');
insert into deposit(savingName) VALUES (' According to the rules ');
insert into deposit(savingName,descript) VALUES (' One year for petty cash deposit and lump sum withdrawal ',' The deposit period is one year ');
insert into deposit(savingName,descript) VALUES (' Two years of petty cash deposit and withdrawal ',' The deposit period is two years ');
insert into deposit(savingName,descript) VALUES (' Zero deposit and lump sum withdrawal for three years ',' The deposit period is three years ');
select * from deposit; # see deposit Table data 
​
# Insert full record ：insert into  Table name ( Field 1, Field 2,....) values (' Field 1 Corresponding data 1',' Field 2 Corresponding data 2');
# View the data ：select  Field name  form  Table name ;

9. Insert data into the customer information table

INSERT into userInfo(customerName,PID,telephone,address) VALUES 
(' Zhou also ','431281200108193619','0719-26224941',' Wuchang District, Wuhan City, Hubei Province '),
(' Wang Ke ','441391200201294618','0729-44624944',' Hongshan District, Wuhan City, Hubei Province '),
(' Ho ho ','42128120020413463X','0749-21227409',' Qingshan District, Wuhan City, Hubei Province '),
(' Wang Hanyu ','761212200308191682','0927-22492341',' Huarong District, Ezhou City, Hubei Province '),
(' ruban ','663221200308211352','1127-52592652',' Huarong District, Ezhou City, Hubei Province ');
select * from userInfo;
​
# Insert part of the data record 
insert into  Table name ( Field 1, Field 2,......) values 
(' Field 1 Corresponding data 1',' Field 2 Corresponding data 2',.....),
(' Field 1 Corresponding data 1',' Field 2 Corresponding data 2',.....),
(' Field 1 Corresponding data 1',' Field 2 Corresponding data 2',.....);

10. Insert data into the bank card table

INSERT into cardInfo(cardID,savingID,openMoney,balance,customerID) VALUES 
('6227 2666 1234 5678',1,1000,1000,1),
('6227 2666 5678 1234',2,6000,6000,2),
('6227 2666 1432 5876',3,9000,9000,3),
('6227 2666 1234 5666',4,2500,2500,4),
('6227 2666 1234 5888',5,3600,3600,5); 
select * from cardInfo;

11. Insert data into the transaction table

INSERT into tradeinfo(tradeType,cardID,tradeMoney) VALUES (' spending ','6227 2666 1234 5678',900);
​
# Insert transactions in the transaction table 
​
UPDATE cardInfo SET balance = balance-900 where cardID = '6227 2666 1234 5678';
​
# Update the existing balance in the bank card table .
​
INSERT into tradeinfo(tradeType,cardID,tradeMoney) VALUES (' Deposit in ','6227 2666 5678 1234',5000);
​
# Insert transactions in the transaction table 
​
UPDATE cardInfo set balance = balance+5000 where cardID = '6227 2666 5678 1234';
​
# Update the existing balance in the bank card table .
​
INSERT into tradeinfo(tradeType,cardID,tradeMoney) VALUES (' spending ','6227 2666 1432 5876',1000);
​
# Insert transactions in the transaction table 
​
UPDATE cardInfo set balance = balance-1000 where cardID = '6227 2666 1432 5876';
​
# Update the existing balance in the bank card table .
​
INSERT into tradeinfo(tradeType,cardID,tradeMoney) VALUES (' Deposit in ','6227 2666 1234 5666',3000);
​
# Insert transactions in the transaction table 
​
UPDATE cardInfo set balance = balance+3000 where cardID = '6227 2666 1234 5666';
​
# Update the existing balance in the bank card table .
​
INSERT into tradeinfo(tradeType,cardID,tradeMoney) VALUES (' Deposit in ','6227 2666 1234 5888',1000);
​
# Insert transactions in the transaction table 
​
UPDATE cardInfo set balance = balance+1000 where cardID = '6227 2666 1234 5888';
​
# Update the existing balance in the bank card table .
​
select * from cardInfo; # View the bank card information table data  ---> result 1
select * from tradeInfo; # View transaction table data ---> result 2

12. To write SQL Statements for

1. Change customer password

# modify customerID=1, Zhou Ye's bank card password 
​
UPDATE cardInfo set password = '123456' where cardID = '6227 2666 1234 5678';
​
# modify customerID=3, Ho Ho's bank card password 
​
UPDATE cardInfo set password = '654321' where cardID = '6227 2666 1432 5876';
​
select * from cardInfo;# View the bank card information table 
​
​
# Modification of table records ：UPDATE sentence 
# Grammar format ：update [ Optional parameters ]  Data table name  set  Field 1= value 1[, Field 2= value 2....] [where  Conditional expression ] [orderby] [limit]
# Optional parameters ：low_priority, Indicates the available latency when multiple users access the database UPDATE operation , Until no other user reads the data , This procedure is only applicable to the storage engine of table level lock .                      ignore： stay mysql in , If an error occurs in the update statement , Whole update Statement operations are canceled , All rows updated by the error are restored to their original values . therefore , In order to continue when errors occur            to update , have access to ignore Parameters 
#set： Specify the field name and its value to be modified in the data table . The value can be an expression , It can also be the default value corresponding to this field . If you want to set default values , You need to use the keyword default.
#where: Used to limit the rows in the table to be modified , If the clause is not specified , that update Statement will update all rows in the table .
#orderby： Used to limit the order in which rows in the table are modified 
#limit： Used to limit the number of lines modified 

2. Report the loss of bank card

# Zhou also accidentally lost his bank card , Apply for loss reporting service 
​
update cardInfo set isReportLoss = 1 where cardID = '6227 2666 1234 5678';
select * from cardInfo;
​
​
# View the password modification and loss report results 
​
select cardID,curID,savingName,openDate,openMoney,balance,password,
case isReportLoss
    when  1 then ' Report the loss of '
    when  0 then ' The loss has not been reported '
end,customerName 
from cardInfo INNER JOIN deposit on cardInfo.savingID = deposit.savingID
INNER JOIN userInfo on cardInfo.customerID = userInfo.customerID;
​
​
#case Statement is a conditional judgment statement , It is used to judge the large program structure by multiple branches 
case  expression 
when when_value then statement_list;
[when when_value then statement_list;].....
else select 'good';
end case;
 If when_value The value of the expression matches the value of , execute then After keyword statement_list sentence .
 If when_value The values of the expressions do not match , execute else The statement after the keyword .
# Multi-table query ：
# Rule of grammar ：
select [ Table name .]  Target field name  [AS  Alias ]
from  Left table name [AS  Alias ]  Connection type   Right table name [AS  Alias ]
on  Connection condition 
[where  Conditional expression ];
# Connection types and operators ：
1.cross join： Cross connect 
2.inner join or join： Internal connection 
3.left join or left outer join： The left outer join 
4.right join or right outer join： Right connection 
5.full join or full outer join： Complete connection 

3. Check the account opening information of this week

#date_sub() Function to subtract a specified time interval from a date . Grammar format ：
​
#data_sub(date,INTERVAL expr type)
​
# Parameter description ：date： Legal date expression ,expr： Specified time interval .
​
#type： Interval type , Yes miscrosecond,seconde,minute,hour,day,week,mounth,year etc. 
​
select cardInfo.cardID,userInfo.customerName,cardInfo.curID,deposit.savingName,cardInfo.openDate,cardInfo.openMoney,cardInfo.balance,
case cardInfo.isReportLoss
when 1 then ' Loss reporting account '
when 2 then ' Normal account '
end
from cardInfo cardInfo INNER join userInfo on cardInfo.customerID = userInfo.customerID
INNER join deposit  on cardInfo.savingID=deposit.savingID  
where openDate > DATE_SUB(CURDATE(),INTERVAL 1 week); # Non equivalent connection 
​
# Internal connection ：select  List of field names  from  Table name 1 inner join  Table name 2 on  Table name 1  Field name   Comparison operator   Table name 2  Field name ;

4. Query the card number with the highest transaction amount in this month

select DISTINCT cardID from tradeInfo  #Distinct： Remove duplicate card numbers 
where tradeMoney = (SELECT MAX(tradeMoney) from tradeInfo # Using subqueries 
WHERE tradeDate > DATE_SUB(CURDATE(),INTERVAL 1 MONTH)); # The time is this month 
​
​
#DATE_SUB() function ----> Subtract the specified time interval from the date .
 Rule of grammar ：DATE_SUB(date,INTERVAL expr type)
type  The parameters can be the following values ：
MICROSECOND # microsecond 
SECOND # Number of seconds 
MINUTE # Minutes 
HOUR   # Hours 
DAY    # Days 
WEEK   # Weeks 
MONTH  # Monthly number 
QUARTER # quarter 
YEAR   # number of years 
.......
​
​
#CURDATE----> Get the current date of the system 

5. Inquire about the customer who reported the loss

select customerName,telephone from userInfo 
where customerID in(SELECT customerID from cardInfo where isReportLoss =1);
​
# Inquire about the customer who reported the loss , Display the name and telephone number of the customer who reported the loss 
#SELECT customerID from cardInfo where isReportLoss =1  Query the bank card information table isReportLoss =1 Of users ID

6. Dunning prompt business

# According to some kind of business ( Such as paying telephone charges , Pay mobile phone fee on behalf of others ) The need for , At the end of each month , If the balance on the customer's account is found to be less than 1100 element , The bank will uniformly call for payment .
# Using link queries or subqueries 
select customerName,telephone,balance 
from userInfo INNER JOIN cardInfo 
on cardInfo.customerID = userInfo.customerID
where balance<1100;

13. establish , Use view

1. establish view_user Try ：

### In order to display information to customers, friendly , All fields required to query each table are Chinese field names .
# Output bank customer records 

drop view if EXISTS view_user; # Delete view_user Try , Avoid that there are already in the database view_user View 
create view view_user
AS
select customerID as  Customer number ,customerName as  Account name ,PID AS  ID number ,telephone as  Phone number ,address as  Residential address  from userInfo;

select * from view_user;# View view details 


# View creation 
create [or replace] [algoritm]={undefined|merge|temptable} 
view view_name [( List of field names )]
as select sentence   [with[cascaded|local] check option]

2. establish view_card Try ：

# Output bank card records 
drop view if exists view_card; 
create view view_card 
AS
SELECT cardinfo.cardID  Card number ,userinfo.customerName  Name of customer ,cardinfo.curID  Type of currency ,deposit.savingName  Type of deposit ,cardinfo.openDate  Account opening date ,cardinfo.balance  balance ,cardinfo.password  password ,
case cardinfo.isReportLoss
when 1 then ' Report the loss of '
when 0 then ' normal '
end  Account status 
from cardinfo INNER JOIN userInfo  on cardinfo.customerID=userinfo.customerID INNER JOIN deposit on cardinfo.savingID = deposit.savingID;
SELECT * from view_card; 

3. establish view_trade Try ：

# Transaction information view 

drop view if EXISTS view_trade;
CREATE view view_trade 
AS
SELECT tradeDate as  Transaction date ,tradeType as  Type of transaction ,cardId as  Card number ,tradeMoney as  Trading money ,machine as  Terminal number  from tradeInfo;
select * from view_trade;

14. Use transactions and stored procedures to implement business processing

1. Complete deposit or withdrawal business

Drop PROCEDURE if EXISTS trade_proc;
CREATE PROCEDURE trade_proc(IN t_type char(2),In t_money DOUBLE,in card_id char(19),in m_id char(8))
MODIFIES sql DATA  # Indicates that the subroutine contains data to be written SQL sentence .
BEGIN
 DECLARE ye DOUBLE; # Declare variables ye by double type 
 start TRANSACTION; # Start transaction 
 if(t_type=" draw ")then
  INSERT into tradeinfo(tradeType,cardID,tradeMoney,machine)  VALUES (t_type,card_id,t_money,m_id); 
	UPDATE cardinfo set balance = balance - t_money where cardID = card_id;
    if(ye <0) then 
	SELECT " Lack of balance ";
	ROLLBACK;# Roll back the transaction 
	else
	COMMIT;# Save in database 
	end if;
end if;
if(t_type=" Deposit in ")then
 INSERT into tradeinfo(tradeType,cardID,tradeMoney,machine)  VALUES (t_type,card_id,t_money,m_id);
	UPDATE cardinfo set balance = balance + t_money where cardID = card_id;
	COMMIT;
    end if;
end;
	
# Create and call stored procedures without input parameters 
create procedure   The process of ()
begin
mysql sentence 
end;

#if The sentence judges the condition according to the logical relationship ture still false, Go to execute the statement in the corresponding branch 
# Grammatical structure ：
if expr_condition then 
   statement_list
elseif expr_condition then 
   statement_list
else statement_list
end if;

2. Generate random card number

# Of random functions rand Use 
#rand( Random seeds )
# Will produce 0~1 The random number , The random seeds are required to be different each time . To ensure that random seeds are different every time , The commonly used algorithm is ：
# Random seeds = The current month *10000+ Current minutes *1000+ Current seconds *100
# produce 0~1 After the random number of , Take the decimal point 8 by , namely 0.xxxxxxxx

DROP PROCEDURE IF EXISTS use_randCardID;
CREATE PROCEDURE use_randCardID(OUT randCardID char(19))
BEGIN
    DECLARE r DECIMAL(15,8); #declare Declare variables 
    DECLARE tempStr CHAR(10); 
    SELECT RAND((MONTH(NOW())*10000)+(MINUTE(NOW())*1000)+(SECOND(NOW())*100)) INTO r;
    SET tempStr=CONVERT(r, CHAR(10));#CONVERT()  Function is a general function that converts dates to new data types .
    SET randCardID=CONCAT('6227 2666 ', SUBSTRING(tempStr, 3, 4), ' ', SUBSTRING(tempStr, 7, 4));
END;

# Random card number generated by the test 

set @kh=" ";
call use_randCardID(@kh);
SELECT @kh;

3. Statistics of bank capital circulation amount and profit settlement

# Amount of funds in circulation = The total amount deposited - Total expenditure amount 

# Profit settlement = Total withdrawal amount x0.008- Total deposit amount x0.003

# Tips ： Define two variables to store the total deposit amount and the total withdrawal amount . Use sum() Function to summarize , Use the conversion function convert()

# Calculate the amount of bank funds in circulation 
drop procedure if EXISTS profit_proc1;
create PROCEDURE profit_proc1(out y1 DOUBLE)
reads sql data
BEGIN
DECLARE l_in DOUBLE;
declare l_out DOUBLE;
SELECT sum(tradeMoney) into l_in from tradeinfo where tradeType = " Deposit in ";
SELECT sum(tradeMoney) into l_out from traneinfo where tradeType = " spending ";
set y1=l_out-l_in;
end;
# Calculate profit settlement 
drop PROCEDURE if EXISTS profit_proc2;
CREATE PROCEDURE profit_proc(out y2 DOUBLE)
reads sql data
BEGIN 
DECLARE l_in DOUBLE;
declare l_out DOUBLE;
SELECT sum(tradeMoney) into l_in from tradeinfo where tradeType = " Deposit in ";
SELECT sum(tradeMoney) into l_out from traneinfo where tradeType = " spending ";
set y2=l_out*0.008 - l_in*0.003;
end;

4. Transfer is realized by transaction

DROP PROCEDURE IF EXISTS useTradefer_proc;
CREATE PROCEDURE useTradefer_proc(
    IN outCard_id CHAR(19),
    IN inCard_id CHAR(19),
    IN z_je DOUBLE,
    IN m_id CHAR(4))
MODIFIES SQL DATA
BEGIN
    DECLARE ye DOUBLE;
    DECLARE err INT DEFAULT 0; #  Cumulative number of error messages 
    DECLARE errl INT DEFAULT 0;
--     DECLARE CONTINUE HANDLER FOR SQLEXCEPTION SET errl=1;
    #  Transfer in account does not exist 
		DECLARE bankCount INT DEFAULT 0;
		SELECT count(*) into bankCount FROM cardinfo WHERE cardID=inCard_id;
    IF !bankCount THEN
        SELECT " Transfer in account does not exist ";
        SET err=err+1;
				set errl = 1;
    END IF;
    #  The balance of the transfer out account is insufficient （ Less than the transfer amount ）
    SELECT balance INTO ye FROM cardinfo WHERE cardID=outCard_id;
    IF(ye<z_je) THEN
        SELECT " Insufficient account balance ";
        SET err=err+1;
				set errl = 1;
    END IF;
    #  Transfer and record transaction information normally without error information 
    IF(err=0) THEN
        START TRANSACTION;      
        UPDATE cardinfo SET balance=balance-z_je WHERE cardID=outCard_id;       
        UPDATE cardinfo SET balance=balance+z_je WHERE cardID=inCard_id;        
        INSERT INTO tradeinfo(tradeType, cardID, tradeMoney, machine)
        VALUES(' spending ', outCard_id, z_je, m_id);       
        INSERT INTO tradeinfo(tradeType, cardID, tradeMoney, machine)
        VALUES(' Deposit in ', inCard_id, z_je, m_id);        
        #  If no error is reported, submit , If you report an error, roll back 
        IF(errl=1) THEN
            SELECT errl;
            ROLLBACK;
        ELSE
            COMMIT;
        END IF;
    END IF;
END;

call useTradefer_proc('6227 2666 1234 5666', '6227 2666 1234 5678',1,1);
SELECT * from tradeinfo;  ---> result 1
select * from cardinfo;   ---> result 2