从SQLite 3导出数据

Question

I need a simple way to export data from an SQLite database of multiple tables, then import them into another database.

Here is my scenario. I have 5 tables: A, B, C, D, E.

Each table has a primary key as the first column called ID. I want a Unix command that will dump ONLY the data in the row from the primary key in a format that can be imported into another database.

I know I can do a

sqlite3 db .dump | grep INSERT

but that gives me ALL data in the table. I'm not a database expert, and I'm trying to do this with all unix commands in which I can write a shell script, rather than writing C++ code to do it (because that's what people are telling me that's the easiest way). I just refuse to write C++ code to accomplish a task that possible can be done in 4-5 statements from the command line.

Any suggestions?

Answer 1

This may look a little weird, however you may give it a try:

Create text file and place following statements there:

.mode insert
.output insert.sql
select * from TABLE where STATEMENT; -- place the needed select query here
.output stdout

Feed this file to sqlite3:

$ sqlite3 -init initf DATA.DB .schema > schema.sql

As the result you will get two files: one with simple "inserts" ( insert.sql ) and another with db schema ( schema.sql ).

Answer 2

Suggest finding a tool that can take your query and export to a CSV. It sounds like you wanted a script. Did you want to reuse and automate this?

For other scenarios, perhaps consider the sqlite-manager Firefox plugin . It supports running your adhoc queries, and exporting the results to a CSV.

Within that, give it this statement:

 SELECT ID FROM TableA

Repeat for each table as you need.

Answer 3

你也可以使用SQLite的quote函数。

echo "SELECT 'INSERT INTO my_new_table (my_new_key) VALUES (' || quote(my_old_key) || ');' FROM my_old_table;" | sqlite my_table > statements.sql

Answer 4

You can use sqlite3 bash. For example if you want to get insert query for all records in one table, you can do the followings:

$ sqlite3 /path/to/db_name.db
>>.mode insert
>>.output insert.sql
>>select * from table_name;

It will creates a file name called insert.sql and puts insert query for every record in the given table.

A sample for what you get in insert.sql :

INSERT INTO "table" VALUES("data for record one");
INSERT INTO "table" VALUES("data for record two");
..