[英]JAVA How to build a sql query with JOOQ step by step
In my Java code, I want to create a long query, I find JOOQ to build query and I use it without generation class but I don't find the way to build my query step by step like this: 在我的Java代码中,我想创建一个长查询,找到JOOQ来构建查询,并且在没有生成类的情况下使用它,但是我找不到这样逐步构建查询的方法:
DSLContext request = DSL.using(sqlConnection, SQLDialect.MYSQL);
request.insertInto(DSL.table("MyTable"), DSL.field("MyColumn1"), DSL.field("MyColumn2"));
// ... some code ...
request.values("hello", 98);
// ... some code ...
request.values("world", 67);
// ... some code ...
request.execute();
How to make this ? 如何做到这一点?
You have many options. 您有很多选择。
... and assign the intermediate types to a local variable: ...并将中间类型分配给局部变量:
DSLContext request = DSL.using(sqlConnection, SQLDialect.MYSQL);
InsertValuesStep2<?, Object, Object> step = request.insertInto(
DSL.table("MyTable"), DSL.field("MyColumn1"), DSL.field("MyColumn2"));
// ... some code ...
step = step.values("hello", 98);
// ... some code ...
step = values("world", 67);
// ... some code ...
step.execute();
... This kind of dynamic SQL is probably easier to implement using the model API (see also http://www.jooq.org/doc/latest/manual/sql-building/sql-statements/dsl-and-non-dsl ) ...使用模型API可能更容易实现这种动态SQL(另请参见http://www.jooq.org/doc/latest/manual/sql-building/sql-statements/dsl-and-non- dsl )
DSLContext request = DSL.using(sqlConnection, SQLDialect.MYSQL);
InsertQuery<?> insert = request.insertQuery(DSL.table("MyTable"));
// ... some code ...
insert.addValue(DSL.field("MyColumn1", String.class), "hello"))
insert.addValue(DSL.field("MyColumn1", Integer.class), 98))
// ... some code ...
insert.newRecord();
insert.addValue(DSL.field("MyColumn1", String.class), "world"))
insert.addValue(DSL.field("MyColumn1", Integer.class), 67))
// ... some code ...
insert.execute();
An alternative would be to send a batch of multiple individual statements to the server by using the batch API ( http://www.jooq.org/doc/latest/manual/sql-execution/batch-execution ). 一种替代方法是使用批处理API( http://www.jooq.org/doc/latest/manual/sql-execution/batch-execution )将一批多个单独的语句发送到服务器。 For example:
例如:
request.batch(DSL.insertInto(
DSL.table("MyTable"), DSL.field("MyColumn1"), DSL.field("MyColumn2"))
.values((String) null, null))
.bind("hello", 98)
.bind("world", 67)
.execute();
... or, in a more dynamic form: ...或者以更动态的形式:
List<Object[]> values = new ArrayList<>();
// ... some code ...
values.add(new Object[] { "hello", 98 });
// ... some code ...
values.add(new Object[] { "world", 67});
request.batch(DSL.insertInto(
DSL.table("MyTable"), DSL.field("MyColumn1"), DSL.field("MyColumn2"))
.values((String) null, null))
.bind(values.toArray(new Object[list.size()][]))
.execute();
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