Condition

There are variant condition and you will find out the method name is same to SQL syntax. Condition is used in Builder, sometimes also used as value. Here docs is for special condition, such as gt(>)/ge(>=)/lt(<)/le(<=)/like/ne(<>)/eq(=), assume you can handle it by yourself.

var

Sometimes, we need to make condition without place holder which display in SQL with ?, but directly display in SQL, just like Cond.var("key", "value") output key = value, check example as follow.

Builder builder = new SelectBuilder()
    .select()
    .from("t_table", "t_table1")
    .where()
    .var("t_table.id", "t_table1.id")
    .build();

SQL: select * from t_table, t_table1 where t_table.id=t_table1.id

groupBy/having

Builder builder = new SelectBuilder()
    .select("name", "age")
    .from("t_table")
    .groupBy("name", "age").having(Cond.gt("age", 18))
    .build();

SQL: select name, age from t_table group by name,age having ( age > ?) VALUE: 18

orderBy

Builder builder = new SelectBuilder()
    .select("name", "age")
    .from("t_table")
    .orderBy("name desc", "age")
    .build();

SQL: select name, age from t_table order by name desc,age

isNull/isNotNull

Builder builder = new SelectBuilder()
    .select("name", "age")
    .from("t_table")
    .where()
    .isNull("name")
    .and()
    .isNotNull("age")
    .build();

SQL: select name, age from t_table where name is null and age is not null

forUpdate

Builder builder = new SelectBuilder()
    .select("name", "age")
    .from("t_table")
    .where()
    .eq("id", 123456789)
    .forUpdate()
    .build();

SQL: select name, age from t_table where id = ? for update

VALUE: 123456789

and/or

Sometimes we need to resolve multi conditions combination, then and(Condition... conditions) and or(Condition... conditions) could be used, as following example you can find out their usage.

Builder builder = new SelectBuilder()
    .select("name", "age")
    .from("t_table")
    .where()
    .and(Cond.like("name", "%Lee"), Cond.gt("age", 18))
    .and()
    .or(Cond.eq("age", 12), Cond.eq("age", 16))
    .build();

SQL: select name, age from t_table where ( name like ? and age > ?) and ( age = ? or age = ?)

VALUE: "%Lee", 18, 12, 16

exists

Builder existsSelect = new SelectBuilder()
    .select("1")
    .from("t_table1")
    .where()
    .var("t_table.id", "t_table1.id")
    .build();
Builder builder = new SelectBuilder()
    .select()
    .from("t_table")
    .where()
    .exists(existsSelect)
    .build();

SQL: select * from t_table where exists (select 1 from t_table1 where t_table.id=t_table1.id)

notExists

Builder existsSelect = new SelectBuilder()
    .select("1")
    .from("t_table1")
    .where()
    .var("t_table.id", "t_table1.id")
    .build();
Builder builder = new SelectBuilder()
    .select()
    .from("t_table")
    .where()
    .notExists(existsSelect)
    .build();

SQL: select * from t_table where not exists (select 1 from t_table1 where t_table.id=t_table1.id)

in

with Array

Builder select = new SelectBuilder().select().from("table").where().in("lang", "TW", "CN", "HK").build();

SQL: select * from table where lang in (?,?,?)

VALUE: "TW", "CN", "HK"

with java.util.Collection

Builder select = new SelectBuilder()
    .select()
    .from("table")
    .where()
    .in("lang", new LinkedList<String>() {{
        add("TW");
        add("CN");
        add("HK");
    }}})
    .build();

SQL: select * from table where lang in (?,?,?)

VALUE: "TW", "CN", "HK"

with SelectBuilder

Builder selectIn = new SelectBuilder().select("name").from("table_1").where().like("name", "%jsql%").build();
Builder select = new SelectBuilder().select().from("table").where().in("name", selectIn).build();

SQL: select * from table where name in (select name from table where name like ?)

VALUE: "%jsql%"

Join Table

inner Join

Builder builder = new SelectBuilder()
    .select()
    .from("table_1").joinOn("table_2", Cond.var("table1.id", "table2.id"), Cond.eq("t.framework", "jsql"))
    .build();

SQL: select * from table_1 join table_2 on (table1.id=table2.id and t.framework = ?)

VALUE: "jsql"

left Join

Builder builder = new SelectBuilder()
    .select()
    .from("table_1").leftJoinOn("table_2", Cond.var("table1.id", "table2.id"))
    .build();

SQL: select * from table_1 left join table_2 on (table1.id=table2.id and t.framework = ?)

VALUE: "jsql"

right Join

Builder builder = new SelectBuilder()
    .select()
    .from("table_1").rightJoinOn("table_2", Cond.var("table1.id", "table2.id"))
    .build();

SQL: select * from table_1 right join table_2 on (table1.id=table2.id and t.framework = ?)

VALUE: "jsql"

outer Join

Builder builder = new SelectBuilder()
    .select()
    .from("table_1").outerJoinOn("table_2", Cond.var("table1.id", "table2.id"))
    .build();

SQL: select * from table_1 outer join table_2 on (table1.id=table2.id and t.framework = ?)

VALUE: "jsql"

full join

Builder builder = new SelectBuilder()
    .select()
    .from("table_1").fullJoinOn("table_2", Cond.var("table1.id", "table2.id"))
    .build();

SQL: select * from table_1 full join table_2 on (table1.id=table2.id and t.framework = ?)

VALUE: "jsql"

offset/limit

Offset and limit will make different paging SQL by different Dialect, as following example will show you MySQL and Oracle Dialect offset and limit setting. Only set offset without limit is forbidden, but only set limit is allow, e.g. Builder.offset(6).build() will occur error.

MySQL

Builder select = new SelectBuilder(Dialects.MYSQL).select().from("table").where().eq("id", "0123456789").offset(5).limit(10).build();

SQL: select * from table where id = ? limit ?,?

VALUE: "0123456789", 5, 10

Builder select = new SelectBuilder(Dialects.MYSQL).select().from("table").where().eq("id", "0123456789").limit(10).build();

SQL: select * from table where id = ? limit ?

VALUE: "0123456789", 10

Oracle

Builder select = new SelectBuilder(Dialects.ORACLE).select().from("table").where().eq("id", "0123456789").offset(5).limit(10).build();

SQL:

select * from ( select source_.*, rownum rownum_0_ from (select * from table where id = ? ) source_ where rownum <= ?) where rownum_0_ > ?

VALUE: "0123456789", 10, 5

Builder select = new SelectBuilder(Dialects.ORACLE).select().from("table").where().eq("id", "0123456789").limit(10).build();

SQL: select from ( select from table where id = ? ) where rownum <= ?

VALUE: "0123456789", 10

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