sqlite3数据库使用实例
SQLite version 3.7.9 2011-11-01 00:52:41
Enter ".help" for instructions
Enter SQL statements terminated with a ";"
sqlite> create table students(
...> id integer primary key,
...> name text not null unique,
...> sex int default 1,
...> bak text);
sqlite> .tables
students
sqlite> .help
.backup ?DB? FILE Backup DB (default "main") to FILE
.bail ON|OFF Stop after hitting an error. Default OFF
.databases List names and files of attached databases
.dump ?TABLE? ... Dump the database in an SQL text format
If TABLE specified, only dump tables matching
LIKE pattern TABLE.
.echo ON|OFF Turn command echo on or off
.exit Exit this program
.explain ?ON|OFF? Turn output mode suitable for EXPLAIN on or off.
With no args, it turns EXPLAIN on.
.header(s) ON|OFF Turn display of headers on or off
.help Show this message
.import FILE TABLE Import data from FILE into TABLE
.indices ?TABLE? Show names of all indices
If TABLE specified, only show indices for tables
matching LIKE pattern TABLE.
.load FILE ?ENTRY? Load an extension library
.log FILE|off Turn logging on or off. FILE can be stderr/stdout
.mode MODE ?TABLE? Set output mode where MODE is one of:
csv Comma-separated values
column Left-aligned columns. (See .width)
html HTML
<
table> code
insert SQL insert statements for TABLE
line One value per line
list Values delimited by .separator string
tabs Tab-separated values
tcl TCL list elements
.nullvalue STRING Print STRING in place of NULL values
.output FILENAME Send output to FILENAME
.output stdout Send output to the screen
.prompt MAIN CONTINUE Replace the standard prompts
.quit Exit this program
.read FILENAME Execute SQL in FILENAME
.restore ?DB? FILE Restore content of DB (default "main") from FILE
.schema ?TABLE? Show the CREATE statements
If TABLE specified, only show tables matching
LIKE pattern TABLE.
.separator STRING Change separator used by output mode and .import
.show Show the current values for various settings
.stats ON|OFF Turn stats on or off
.tables ?TABLE? List names of tables
If TABLE specified, only list tables matching
LIKE pattern TABLE.
.timeout MS Try opening locked tables for MS milliseconds
.width NUM1 NUM2 ... Set column widths for "column" mode
.timer ON|OFF Turn the CPU timer measurement on or off
sqlite> .schema students
CREATE TABLE students(
id integer primary key,
name text not null unique,
sex int default 1,
bak text);
sqlite> insert into students values('aa',0,'abc');
Error: table students has 4 columns but 3 values were supplied
sqlite> insert into students(name) values('aaa');
sqlite> select *from students
...> ;
1|aaa|1|
sqlite> .show
echo: off
explain: off
headers: off
mode: list
nullvalue: ""
output: stdout
separator: "|"
stats: offinsert
width:
sqlite> .headers on
sqlite> .separator "\t"
sqlite> select *from students;
id name sex bak
1 aaa 1
sqlite> insert into students(name,sex,bak) values('aaa',0,'test');
Error: column name is not unique
sqlite> insert into students(name,sex,bak) values('bbb',0,'test');
sqlite> select *from students;
id name sex bak
1 aaa 1
2 bbb 0 test
sqlite> select *from students order by id desc
...> ;
id name sex bak
2 bbb 0 test
1 aaa 1
sqlite> select *from student where bak is null;
Error: no such table: student
sqlite> select *from students where bak is null;
id name sex bak
1 aaa 1
sqlite> select count(*) from studetns;
Error: no such table: studetns
sqlite> select count(*) from students;
count(*)
2
sqlite> select count(*) as count from students;
count
2
sqlite> create table scores(
...> id integer primary key,
...> type text,
...> score float not null check (socre > -1 and score < 101),
...> stu_id integer references students(id));
Error: no such column: socre
sqlite> create table scores(
...> id integer primary key,
...> type text,
...> score float not null check (score > -1 and score < 101),
...> stu_id integer references students(id));
sqlite> insert into scores(type,socre,stu_id) values('c',70,3);
Error: table scores has no column named socre
sqlite> insert into scores(type,score,stu_id) values('c',70,3);
sqlite> select *from scores;
id type score stu_id
1 c 70.0 3
sqlite> delete from scores;
sqlite> select *from scores;
sqlite> pragma foreign_keys on;
Error: near "on": syntax error
sqlite> pragma foreign_keys=on;
sqlite> insert into scores(type,score,stu_id) values('c',70,3);
Error: foreign key constraint failed
sqlite> insert into scores(type,score,stu_id) values('c',70,2);
sqlite>
