拓展阅读
The jdbc pool for java.(java 手写 jdbc 数据库连接池实现)
The simple mybatis.（手写简易版 mybatis）
JOOQ
JOOQ 可以通过数据库直接生成 java 代码，通过 flent-api 进行数据库操作。
SQL builder
JOOQ 非常的灵活和强大。你可以用它来拼装 SQL 语句
// Fetch a SQL string from a jOOQ Query in order to manually execute it with another tool.
// For simplicity reasons, we're using the API to construct case-insensitive object references, here.
String sql = create.select(field("BOOK.TITLE"), field("AUTHOR.FIRST_NAME"), field("AUTHOR.LAST_NAME")).from(table("BOOK")).join(table("AUTHOR")).on(field("BOOK.AUTHOR_ID").eq(field("AUTHOR.ID"))).where(field("BOOK.PUBLISHED_IN").eq(1948)).getSQL();
结合代码生成
上面的字段都是我们手动指定的，可能会出错。
可以结合代码的自动生成+SQL构建：
// Fetch a SQL string from a jOOQ Query in order to manually execute it with another tool.
String sql = create.select(BOOK.TITLE, AUTHOR.FIRST_NAME, AUTHOR.LAST_NAME).from(BOOK).join(AUTHOR).on(BOOK.AUTHOR_ID.eq(AUTHOR.ID)).where(BOOK.PUBLISHED_IN.eq(1948)).getSQL();
使用工具直接执行 SQL
// Typesafely execute the SQL statement directly with jOOQ
Result<Record3<String, String, String>> result =
create.select(BOOK.TITLE, AUTHOR.FIRST_NAME, AUTHOR.LAST_NAME).from(BOOK).join(AUTHOR).on(BOOK.AUTHOR_ID.eq(AUTHOR.ID)).where(BOOK.PUBLISHED_IN.eq(1948)).fetch();
- 或者直接执行
// Use your favourite tool to construct SQL strings:
String sql = "SELECT title, first_name, last_name FROM book JOIN author ON book.author_id = author.id " +"WHERE book.published_in = 1984";// Fetch results using jOOQ
Result<Record> result = create.fetch(sql);// Or execute that SQL with JDBC, fetching the ResultSet with jOOQ:
ResultSet rs = connection.createStatement().executeQuery(sql);
Result<Record> result = create.fetch(rs);
CRUD
// Fetch an author
AuthorRecord author : create.fetchOne(AUTHOR, AUTHOR.ID.eq(1));// Create a new author, if it doesn't exist yet
if (author == null) {author = create.newRecord(AUTHOR);author.setId(1);author.setFirstName("Dan");author.setLastName("Brown");
}// Mark the author as a "distinguished" author and store it
author.setDistinguished(1);// Executes an update on existing authors, or insert on new ones
author.store();
