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Ltrim

Definition​

The ltrim method allows you to add the LTRIM function to the query. The LTRIM function removes the longest string containing only characters specified by the argument (whitespace by default) from the start of a string.

There are 2 ways to call this method:

1. Calling from a KColumn or a KTableColumn​

The methods available to use this functionality calling from a KColumn or a KTableColumn are:

  • ltrim(): It does not receive any parameters. The KColumn or KTableColumn that invokes the method will be the one supplied to the LTRIM function.
  • ltrim(String characters): Receives a String which will be supplied to the LTRIM function. The KColumn or KTableColumn that invokes the method will be the one supplied to the LTRIM function.

Example: ()​

Java code:

k
.select(
    APP_USER.EMAIL.ltrim()
)
.from(APP_USER)
.multiple();

SQL generated:

SELECT
    LTRIM(au.email)
FROM app_user au

Parameters:

  • None

Example: (String)​

Java code:

k
.select(
    APP_USER.EMAIL.ltrim("xyz")
)
.from(APP_USER)
.multiple();

SQL generated:

SELECT
    LTRIM(au.email, ?1)
FROM app_user au

Parameters:

  • ?1: "xyz"

2. Calling from the KFunction class​

The methods available to use this functionality calling from the KFunction class are:

  • ltrim(KColumn kColumn): Receives a KColumn or a KTableColumn which will be supplied to the LTRIM function.
  • ltrim(KValTextField kValTextField): Receives a KValTextField which will be supplied to the LTRIM function.
  • ltrim(KColumn kColumn, String characters): Receives a KColumn or a KTableColumn and a String which will be supplied to the LTRIM function.
  • ltrim(KValTextField kValTextField, String characters): Receives a KValTextField and a String which will be supplied to the LTRIM function.

To use this way, you need to import the static functions as follows:

import static com.myzlab.k.KFunction.*;

Example: (KColumn)​

Java code:

k
.select(
    ltrim(APP_USER.EMAIL)
)
.from(APP_USER)
.multiple();

SQL generated:

SELECT
    LTRIM(au.email)
FROM app_user au

Parameters:

  • None

Example: (KValTextField)​

Java code:

k
.select(
    ltrim(val(" A short text"))
)
.single();

SQL generated:

SELECT LTRIM(?1)

Parameters:

  • ?1: " A short text"

Example: (KColumn, String)​

Java code:

k
.select(
    ltrim(APP_USER.EMAIL, "xyz")
)
.from(APP_USER)
.multiple();

SQL generated:

SELECT
    LTRIM(au.email, ?1)
FROM app_user au

Parameters:

  • ?1: "xyz"

Example: (KValTextField, String)​

Java code:

k
.select(
    ltrim(val("A short text"), "A")
)
.single();

SQL generated:

SELECT LTRIM(?1, ?2)

Parameters:

  • ?1: "A short text"
  • ?2: "A"