[SQLite]コマンドプロンプトからSQLite3を実行したメモ

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SQLite3をさわったメモ

SQLiteについて

SQLiteに接続する

sqlite3.exeをダウンロードしてくるか /android-sdk-windows/tools/sqlite3.exe などを利用する。 sqlite3.exeのあるフォルダへ移動して実行する。コマンドライン引数に開くデータベース名を入力する。

> sqlite3.exe testdb.sqlite3
SQLite version 3.7.6
Enter ".help" for instructions
Enter SQL statements terminated with a ";"

これで testdb.sqlite3 作成／接続できる。拡張子は何でもOK。

コマンドを打ち込んでみる

基本はSQL…といってもわずかな触りの部分しか分からないけど…orz

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> DROP TABLE IF EXISTS FOO;
sqlite> CREATE TABLE FOO (
   ...>         ID INTEGER PRIMARY KEY,
   ...>         BAR
   ...> );

sqlite> INSERT INTO FOO(BAR) VALUES("こんにちワン");
sqlite> INSERT INTO FOO(BAR) VALUES("こんばんワニ");
sqlite> INSERT INTO FOO(BAR) VALUES("おはよウナギ");

sqlite> SELECT * FROM FOO;

1|こんにちワン
2|こんばんワニ
3|おはよウナギ

sqlite> .mode column
sqlite> SELECT * FROM FOO;

1           こんにちワン
2           こんばんワニ
3           おはよウナギ

sqlite> .width 2
sqlite> SELECT * FROM FOO;

1   こんにちワン
2   こんばんワニ
3   おはよウナギ

sqlite> UPDATE FOO SET BAR = "さようなライオン" WHERE ID = 3;
sqlite> SELECT * FROM FOO;

1   こんにちワン
2   こんばんワニ
3   さようなライオン

sqlite> CREATE TABLE HOGE(A,B,C);
sqlite> INSERT INTO HOGE VALUES(111,100,1);
sqlite> INSERT INTO HOGE VALUES(111,160,2);
sqlite> INSERT INTO HOGE VALUES(111,109,3);
sqlite> INSERT INTO HOGE VALUES(222,140,1);
sqlite> INSERT INTO HOGE VALUES(222,106,2);
sqlite> INSERT INTO HOGE VALUES(333,777,1);

sqlite> .header ON

sqlite> SELECT * FROM HOGE;

A           B           C
----------  ----------  ----------
111         100         1
111         160         2
111         109         3
222         140         1
222         106         2
333         777         1

sqlite> SELECT * FROM FOO;

ID          BAR
----------  ----------
1           おはよウナギ
2           こんばんワニ
3           さようなライオン

sqlite> SELECT A,SUM(A),SUM(B),SUM(C) FROM HOGE GROUP BY A;

A           SUM(A)      SUM(B)      SUM(C)
----------  ----------  ----------  ----------
111         333         369         6
222         444         246         3
333         333         777         1

sqlite> SELECT A,TOTAL(A),AVG(B),MAX(C) FROM HOGE WHERE A < 300 GROUP BY A;

A           TOTAL(A)    AVG(B)      MAX(C)
----------  ----------  ----------  ----------
111         333.0       123.0       3
222         444.0       123.0       2

sqlite> SELECT A,BAR FROM HOGE INNER JOIN FOO ON HOGE.C = FOO.ID;

A           BAR
----------  ----------
111         おはよウナギ
111         こんばんワニ
111         さようなライオン
222         おはよウナギ
222         こんばんワニ
333         おはよウナギ

sqlite> SELECT A,BAR FROM HOGE INNER JOIN FOO ON HOGE.C = FOO.ID WHERE A = 222;

A           BAR
----------  ----------
222         おはよウナギ
222         こんばんワニ

sqlite> SELECT A,GROUP_CONCAT(BAR," & ") FROM HOGE INNER JOIN FOO ON HOGE.C = FOO.ID WHERE A < 300 GROUP BY A;

A           GROUP_CONCAT(BAR," & ")
----------  ----------------------------------
111         おはよウナギ & こんばんワニ & さようなライオン
222         おはよウナギ & こんばんワニ

sqlite> UPDATE FOO SET BAR = "ぽぽぽぽーん";
sqlite> SELECT BAR FROM FOO;

BAR
------------
ぽぽぽぽーん
ぽぽぽぽーん
ぽぽぽぽーん

sqlite> DELETE FROM FOO;
sqlite> SELECT * FROM FOO;
sqlite> .exit

SUMとかGROUP_CONCATとかそういうものはSQLite関数で調べ

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