QueryBuilder (DataStax Java Driver for Apache Cassandra

java.lang.Object
- com.datastax.driver.core.querybuilder.QueryBuilder

```
public final class QueryBuilder
extends Object
```
Static methods to build a CQL3 query.
The queries built by this builder will provide a value for the Query.getRoutingKey() method only when a TableMetadata is provided to the builder. It is thus advised to do so if a TokenAwarePolicy is in use.
The provider builders perform very little validation of the built query. There is thus no guarantee that a built query is valid, and it is definitively possible to create invalid queries.
Note that it could be convenient to use an 'import static' to use the methods of this class.

Method Summary

Methods
Modifier and Type	Method and Description
`static Assignment`	`add(String name, Object value)` Adds a value to a set column.
`static Assignment`	`addAll(String name, Set<?> set)` Adds a set of values to a set column.
`static Assignment`	`append(String name, Object value)` Append a value to a list column.
`static Assignment`	`appendAll(String name, List<?> list)` Append a list of values to a list column.
`static Ordering`	`asc(String columnName)` Ascending ordering for the provided column.
`static Batch`	`batch(Statement... statements)` Built a new BATCH query on the provided statement.
`static Object`	`bindMarker()` An object representing a bind marker (a question mark).
`static Assignment`	`decr(String name)` Decrementation of a counter column.
`static Assignment`	`decr(String name, long value)` Decrementation of a counter column by a provided value.
`static Delete.Selection`	`delete()` Start building a new DELETE query.
`static Delete.Builder`	`delete(String... columns)` Start building a new DELETE query that deletes the provided names.
`static Ordering`	`desc(String columnName)` Descending ordering for the provided column.
`static Assignment`	`discard(String name, Object value)` Discard a value from a list column.
`static Assignment`	`discardAll(String name, List<?> list)` Discard a list of values to a list column.
`static Clause`	`eq(String name, Object value)` Creates an "equal" where clause stating the provided column must be equal to the provided value.
`static Clause`	`gt(String name, Object value)` Creates a "greater than" where clause stating the provided column must be greater to the provided value.
`static Clause`	`gte(String name, Object value)` Creates a "greater than or equal" where clause stating the provided column must be greater than or equal to the provided value.
`static Clause`	`in(String name, Object... values)` Create an "in" where clause stating the provided column must be equal to one of the provided values.
`static Assignment`	`incr(String name)` Incrementation of a counter column.
`static Assignment`	`incr(String name, long value)` Incrementation of a counter column by a provided value.
`static Insert`	`insertInto(String table)` Start building a new INSERT query.
`static Insert`	`insertInto(String keyspace, String table)` Start building a new INSERT query.
`static Insert`	`insertInto(TableMetadata table)` Start building a new INSERT query.
`static Clause`	`lt(String name, Object value)` Creates a "lesser than" where clause stating the provided column must be less than the provided value.
`static Clause`	`lte(String name, Object value)` Creates a "lesser than or equal" where clause stating the provided column must be lesser than or equal to the provided value.
`static Assignment`	`prepend(String name, Object value)` Prepend a value to a list column.
`static Assignment`	`prependAll(String name, List<?> list)` Prepend a list of values to a list column.
`static Assignment`	`put(String name, Object key, Object value)` Puts a new key/value pair to a map column.
`static Assignment`	`putAll(String name, Map<?,?> map)` Puts a map of new key/value pairs to a map column.
`static String`	`quote(String columnName)` Quotes a columnName to make it case sensitive.
`static Object`	`raw(String str)` Creates a raw string value.
`static Assignment`	`remove(String name, Object value)` Remove a value from a set column.
`static Assignment`	`removeAll(String name, Set<?> set)` Remove a set of values from a set column.
`static Select.Selection`	`select()` Start building a new SELECT query.
`static Select.Builder`	`select(String... columns)` Start building a new SELECT query that selects the provided names.
`static Assignment`	`set(String name, Object value)` Simple "set" assignment of a value to a column.
`static Assignment`	`setIdx(String name, int idx, Object value)` Sets a list column value by index.
`static Using`	`timestamp(long timestamp)` Option to set the timestamp for a modification query (insert, update or delete).
`static String`	`token(String... columnNames)` The token of column names.
`static String`	`token(String columnName)` The token of a column name.
`static Using`	`ttl(int ttl)` Option to set the ttl for a modification query (insert, update or delete).
`static Update`	`update(String table)` Start building a new UPDATE query.
`static Update`	`update(String keyspace, String table)` Start building a new UPDATE query.
`static Update`	`update(TableMetadata table)` Start building a new UPDATE query.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

select
```
public static Select.Builder select(String... columns)
```
Start building a new SELECT query that selects the provided names. Note that select(c1, c2) is just a shortcut for select().column(c1).column(c2) .

Parameters:
columns - the columns names that should be selected by the query.

Returns:
an in-construction SELECT query (you will need to provide at least a FROM clause to complete the query).

select
```
public static Select.Selection select()
```
Start building a new SELECT query.

Returns:
an in-construction SELECT query (you will need to provide a column selection and at least a FROM clause to complete the query).

insertInto
```
public static Insert insertInto(String table)
```
Start building a new INSERT query.

Parameters:
table - the name of the table in which to insert.

Returns:
an in-construction INSERT query.

insertInto
```
public static Insert insertInto(String keyspace,
                String table)
```
Start building a new INSERT query.

Parameters:
keyspace - the name of the keyspace to use.
table - the name of the table to insert into.

Returns:
an in-construction INSERT query.

insertInto
```
public static Insert insertInto(TableMetadata table)
```
Start building a new INSERT query.

Parameters:
table - the name of the table to insert into.

Returns:
an in-construction INSERT query.

update
```
public static Update update(String table)
```
Start building a new UPDATE query.

Parameters:
table - the name of the table to update.

Returns:
an in-construction UPDATE query (at least a SET and a WHERE clause needs to be provided to complete the query).

update
```
public static Update update(String keyspace,
            String table)
```
Start building a new UPDATE query.

Parameters:
keyspace - the name of the keyspace to use.
table - the name of the table to update.

Returns:
an in-construction UPDATE query (at least a SET and a WHERE clause needs to be provided to complete the query).

update
```
public static Update update(TableMetadata table)
```
Start building a new UPDATE query.

Parameters:
table - the name of the table to update.

Returns:
an in-construction UPDATE query (at least a SET and a WHERE clause needs to be provided to complete the query).

delete
```
public static Delete.Builder delete(String... columns)
```
Start building a new DELETE query that deletes the provided names.

Parameters:
columns - the columns names that should be deleted by the query.

Returns:
an in-construction DELETE query (At least a FROM and a WHERE clause needs to be provided to complete the query).

delete
```
public static Delete.Selection delete()
```
Start building a new DELETE query.

Returns:
an in-construction SELECT query (you will need to provide a column selection and at least a FROM and a WHERE clause to complete the query).

batch
```
public static Batch batch(Statement... statements)
```
Built a new BATCH query on the provided statement.

Parameters:
statements - the statements to batch.

Returns:
a new Statement that batch statements.

quote
```
public static String quote(String columnName)
```
Quotes a columnName to make it case sensitive.

Parameters:
columnName - the column name to quote.

Returns:
the quoted column name.

token
```
public static String token(String columnName)
```
The token of a column name.

Parameters:
columnName - the column name to take the token of.

Returns:
"token(" + columnName + ")".

token
```
public static String token(String... columnNames)
```
The token of column names.
This variant is most useful when the partition key is composite.

Parameters:
columnNames - the column names to take the token of.

Returns:
a string representing the token of the provided column names.

eq
```
public static Clause eq(String name,
        Object value)
```
Creates an "equal" where clause stating the provided column must be equal to the provided value.

Parameters:
name - the column name
value - the value

Returns:
the corresponding where clause.

in
```
public static Clause in(String name,
        Object... values)
```
Create an "in" where clause stating the provided column must be equal to one of the provided values.

Parameters:
name - the column name
values - the values

Returns:
the corresponding where clause.

lt
```
public static Clause lt(String name,
        Object value)
```
Creates a "lesser than" where clause stating the provided column must be less than the provided value.

Parameters:
name - the column name
value - the value

Returns:
the corresponding where clause.

lte
```
public static Clause lte(String name,
         Object value)
```
Creates a "lesser than or equal" where clause stating the provided column must be lesser than or equal to the provided value.

Parameters:
name - the column name
value - the value

Returns:
the corresponding where clause.

gt
```
public static Clause gt(String name,
        Object value)
```
Creates a "greater than" where clause stating the provided column must be greater to the provided value.

Parameters:
name - the column name
value - the value

Returns:
the corresponding where clause.

gte
```
public static Clause gte(String name,
         Object value)
```
Creates a "greater than or equal" where clause stating the provided column must be greater than or equal to the provided value.

Parameters:
name - the column name
value - the value

Returns:
the corresponding where clause.

asc
```
public static Ordering asc(String columnName)
```
Ascending ordering for the provided column.

Parameters:
columnName - the column name

Returns:
the corresponding ordering

desc
```
public static Ordering desc(String columnName)
```
Descending ordering for the provided column.

Parameters:
columnName - the column name

Returns:
the corresponding ordering

timestamp
```
public static Using timestamp(long timestamp)
```
Option to set the timestamp for a modification query (insert, update or delete).

Parameters:
timestamp - the timestamp (in microseconds) to use.

Returns:
the corresponding option

Throws:

IllegalArgumentException - if timestamp > 0.

ttl
```
public static Using ttl(int ttl)
```
Option to set the ttl for a modification query (insert, update or delete).

Parameters:
ttl - the ttl (in seconds) to use.

Returns:
the corresponding option

Throws:

IllegalArgumentException - if ttl > 0.

set
```
public static Assignment set(String name,
             Object value)
```
Simple "set" assignment of a value to a column.
This will generate: name = value.

Parameters:
name - the column name
value - the value to assign

Returns:
the correspond assignment (to use in an update query)

incr
```
public static Assignment incr(String name)
```
Incrementation of a counter column.
This will generate: name = name + 1.

Parameters:
name - the column name to increment

Returns:
the correspond assignment (to use in an update query)

incr
```
public static Assignment incr(String name,
              long value)
```
Incrementation of a counter column by a provided value.
This will generate: name = name + value.

Parameters:
name - the column name to increment
value - the value by which to increment

Returns:
the correspond assignment (to use in an update query)

decr
```
public static Assignment decr(String name)
```
Decrementation of a counter column.
This will generate: name = name - 1.

Parameters:
name - the column name to decrement

Returns:
the correspond assignment (to use in an update query)

decr
```
public static Assignment decr(String name,
              long value)
```
Decrementation of a counter column by a provided value.
This will generate: name = name - value.

Parameters:
name - the column name to decrement
value - the value by which to decrement

Returns:
the correspond assignment (to use in an update query)

prepend
```
public static Assignment prepend(String name,
                 Object value)
```
Prepend a value to a list column.
This will generate: name = [ value ] + name.

Parameters:
name - the column name (must be of type list).
value - the value to prepend

Returns:
the correspond assignment (to use in an update query)

prependAll
```
public static Assignment prependAll(String name,
                    List<?> list)
```
Prepend a list of values to a list column.
This will generate: name = list + name.

Parameters:
name - the column name (must be of type list).
list - the list of values to prepend

Returns:
the correspond assignment (to use in an update query)

append
```
public static Assignment append(String name,
                Object value)
```
Append a value to a list column.
This will generate: name = name + [value].

Parameters:
name - the column name (must be of type list).
value - the value to append

Returns:
the correspond assignment (to use in an update query)

appendAll
```
public static Assignment appendAll(String name,
                   List<?> list)
```
Append a list of values to a list column.
This will generate: name = name + list.

Parameters:
name - the column name (must be of type list).
list - the list of values to append

Returns:
the correspond assignment (to use in an update query)

discard
```
public static Assignment discard(String name,
                 Object value)
```
Discard a value from a list column.
This will generate: name = name - [value].

Parameters:
name - the column name (must be of type list).
value - the value to discard

Returns:
the correspond assignment (to use in an update query)

discardAll
```
public static Assignment discardAll(String name,
                    List<?> list)
```
Discard a list of values to a list column.
This will generate: name = name - list.

Parameters:
name - the column name (must be of type list).
list - the list of values to discard

Returns:
the correspond assignment (to use in an update query)

setIdx
```
public static Assignment setIdx(String name,
                int idx,
                Object value)
```
Sets a list column value by index.
This will generate: name[idx] = value.

Parameters:
name - the column name (must be of type list).
idx - the index to set
value - the value to set

Returns:
the correspond assignment (to use in an update query)

add
```
public static Assignment add(String name,
             Object value)
```
Adds a value to a set column.
This will generate: name = name + {value}.

Parameters:
name - the column name (must be of type set).
value - the value to add

Returns:
the correspond assignment (to use in an update query)

addAll
```
public static Assignment addAll(String name,
                Set<?> set)
```
Adds a set of values to a set column.
This will generate: name = name + set.

Parameters:
name - the column name (must be of type set).
set - the set of values to append

Returns:
the correspond assignment (to use in an update query)

remove
```
public static Assignment remove(String name,
                Object value)
```
Remove a value from a set column.
This will generate: name = name - {value}.

Parameters:
name - the column name (must be of type set).
value - the value to remove

Returns:
the correspond assignment (to use in an update query)

removeAll
```
public static Assignment removeAll(String name,
                   Set<?> set)
```
Remove a set of values from a set column.
This will generate: name = name - set.

Parameters:
name - the column name (must be of type set).
set - the set of values to remove

Returns:
the correspond assignment (to use in an update query)

put
```
public static Assignment put(String name,
             Object key,
             Object value)
```
Puts a new key/value pair to a map column.
This will generate: name[key] = value.

Parameters:
name - the column name (must be of type map).
key - the key to put
value - the value to put

Returns:
the correspond assignment (to use in an update query)

putAll
```
public static Assignment putAll(String name,
                Map<?,?> map)
```
Puts a map of new key/value pairs to a map column.
This will generate: name = name + map.

Parameters:
name - the column name (must be of type map).
map - the map of key/value pairs to put

Returns:
the correspond assignment (to use in an update query)

bindMarker

public static Object bindMarker()

An object representing a bind marker (a question mark).

This can be used wherever a value is expected. For instance, one can do:

 Insert i = QueryBuilder.insertInto("test").value("k", 0)
                                               .value("c", QueryBuilder.bindMarker());
     PreparedState p = session.prepare(i.toString());

Returns:: an object representing a bind marker.

raw

public static Object raw(String str)

Creates a raw string value. This allows inputing a string value that is not interpreted/escapted by the query builder in any way. By default, the query builder escape single quotes and recognize function calls in string values. This function avoid both of those behavior.

The following table exemplify the behavior of this function:

Code	Resulting query string
`select().from("t").where(eq("c", "C'est la vie!"));`	`"SELECT * FROM t WHERE c='C''est la vie!';"`
`select().from("t").where(eq("c", raw("C'est la vie!")));`	`"SELECT * FROM t WHERE c='C'est la vie!';"`
`select().from("t").where(eq("c", "now()"));`	`"SELECT * FROM t WHERE c=now();"`
`select().from("t").where(eq("c", raw("now()")));`	`"SELECT * FROM t WHERE c='now()';"`

Note: the 2nd example in this table is not a valid CQL3 query as the quote is not correctly escaped.

Parameters:: str - the string value to use
Returns:: the value but protected from being interpreted/escaped by the query builder.

Class QueryBuilder

Method Summary

Methods inherited from class java.lang.Object

Method Detail

select

select

insertInto

insertInto

insertInto

update

update

update

delete

delete

batch

quote

token

token

eq

in

lt

lte

gt

gte

asc

desc

timestamp

ttl

set

incr

incr

decr

decr

prepend

prependAll

append

appendAll

discard

discardAll

setIdx

add

addAll

remove

removeAll

put

putAll

bindMarker

raw