在Spring Batch chunk-tasklet中生成多个项目(Produce several items in Spring Batch chunk-tasklet)

 在创建表时，您不会创建任何自动递增主键（id）的内容。 您应该使用serial或bigserial为您创建幕后序列。 
 
 同样，当您创建数据库时，它不会自动将您连接到它，因此在创建之后您需要使用\c连接到新数据库。 可能发生的是您在模板或默认数据库中创建表，因此重复键，关系存在错误.. 
 
CREATE DATABASE movie_info;
\c movie_info

CREATE TABLE movie_attributes
(
id serial PRIMARY KEY,
Title varchar(255),
Duration integer,
IMDB_Rating integer,
Release_Date integer
);

CREATE TABLE cinema_info
(
id serial PRIMARY KEY,
Title varchar(255),
Theatre_Number integer UNIQUE,
Showtime varchar(255)
);
 
 应该解决当前的问题。 
 
 对于多个主键，您在DDL中将id指定为主键，然后尝试重新添加。 因此多个键（即使它们是相同的键..） 
 
 另一种选择是在insert语句中指定id。 

when creating your tables, you are not creating anything that auto increments your primary keys (id). You should use either serial or bigserial which create sequences behind the scenes for you..
 
also when you create the database, it doesn't automatically connect you to it, so after creating you need to connect to the new DB using \c. What is probably happening is that you are creating the tables in your template or default database, hence the duplicate keys, relation exists errors.. 
 
CREATE DATABASE movie_info;
\c movie_info

CREATE TABLE movie_attributes
(
id serial PRIMARY KEY,
Title varchar(255),
Duration integer,
IMDB_Rating integer,
Release_Date integer
);

CREATE TABLE cinema_info
(
id serial PRIMARY KEY,
Title varchar(255),
Theatre_Number integer UNIQUE,
Showtime varchar(255)
);
 
should fix the current issue.
 
as for the multiple primary keys, you specify id as primary key in the DDL, then are trying to re-add. Hence the multiple keys (even though they are the same key..) 
 
another option would be to specify the ids, on your insert statements.