ABAP TYPES LOB HANDLE TYPE Statement syntax and functionality in SAP

TYPES - lob_handle_type

ABAP Syntax ... { READER|LOCATOR|{LOB HANDLE} }
| { WRITER|LOCATOR } ...

What does it do? These additions determine the static type of the LOB handle components when deriving an LOB handle structure using the TYPES statement.
The READER addition determines

the static type CL_ABAP_DB_X_READER for BLOB s and

the static type CL_ABAP_DB_C_READER

for CLOB s .
The WRITER addition determines

the static type CL_ABAP_DB_X_WRITER

for BLOB s and

the static type CL_ABAP_DB_C_WRITER

for CLOB s
The LOCATOR addition determines

the static type CL_ABAP_DB_X_LOCATOR

for BLOB s and

the static type CL_ABAP_DB_C_LOCATOR

for CLOB s.
The LOB HANDLE addition determines

the static type IF_ABAP_DB_BLOB_HANDLE

for BLOB s and

the static type IF_ABAP_DB_CLOB_HANDLE

for CLOB s .
The READER and WRITER additions cannot be used together in a TYPES statement. Furthermore, WRITER cannot be used with LOB HANDLE .
The combination possibilities with the lob_handle_columns column specifications are explained with the
TYPES statement.

ABAP TYPES LOB HANDLE TYPE Statement syntax, information and example SAP source code