Question

我有多个具有相同模式的sqlite数据库，我想将它们合并在一起，因为我有一个唯一的列，可能存在重复的风险，我使用insert or ignore，在sqlite中它会是容易：

sqlite3 database.db3
sqlite> attach './db1.db3' as s1;
sqlite> attach './db2.db3' as s2;
sqlite> attach './db3.db3' as s3;
sqlite> insert or ignore into table (c1, c2, c3) select c1, c2, c3 from s1.table;
sqlite> insert or ignore into table (c1, c2, c3) select c1, c2, c3 from s2.table;
sqlite> insert or ignore into table (c1, c2, c3) select c1, c2, c3 from s3.table;
sqlite> .exit

我读了关于转储但我不想合并整个架构，只是一个表，所以我想到了这个解决方案，现在直到这里一切都很好，但我需要通过bash运行所有这些，我尝试了以下但它没有：

sqlite3 database.db3 "attach './db1.db3' as s1;"
sqlite3 database.db3 "attach './db2.db3' as s2;"
sqlite3 database.db3 "attach './db3.db3' as s3;"
sqlite3 database.db3 "select count(*) from s1.table;"
sqlite3 database.db3 "select count(*) from s2.table;"
sqlite3 database.db3 "select count(*) from s3.table;"

它说Error: no such table: s1.table

我做错了什么

Answer 1

使用heredoc，如下所示：

sqlite3 database.db3 << "EOF"
attach './db1.db3' as s1;
attach './db2.db3' as s2;
attach './db3.db3' as s3;
insert or ignore into table (c1, c2, c3) select c1, c2, c3 from s1.table;
insert or ignore into table (c1, c2, c3) select c1, c2, c3 from s2.table;
insert or ignore into table (c1, c2, c3) select c1, c2, c3 from s3.table;
.exit
EOF

或者，将所有命令放入文件并按以下方式运行：

sqlite3 database.db3 < commandsFile

Answer 2

1）创建一个文本文件，其中包含您要输入sqlite命令行程序的行，如下所示：

attach './db1.db3' as s1;
attach './db2.db3' as s2;
attach './db3.db3' as s3;
insert or ignore into table (c1, c2, c3) select c1, c2, c3 from s1.table;
insert or ignore into table (c1, c2, c3) select c1, c2, c3 from s2.table;
insert or ignore into table (c1, c2, c3) select c1, c2, c3 from s3.table;
.exit

然后只需致电sqlite3 database.db < commands.txt

2）使用shell

#!/bin/bash 

sqlite3 database.db <<"EOF"
attach './db1.db3' as s1;
attach './db2.db3' as s2;
attach './db3.db3' as s3;
insert or ignore into table (c1, c2, c3) select c1, c2, c3 from s1.table;
insert or ignore into table (c1, c2, c3) select c1, c2, c3 from s2.table;
insert or ignore into table (c1, c2, c3) select c1, c2, c3 from s3.table;
.exit
EOF

使用bash合并多个SQLite数据库？

2 个答案: