22.33 OPEN_LOCAL_DML_CONTEXT Function

This function opens a DML context based for a local database.

Syntax

FUNCTION OPEN_LOCAL_DML_CONTEXT (
    p_columns               IN t_columns               DEFAULT c_empty_columns,
    p_query_type            IN t_query_type,
    --     
    p_table_owner           IN VARCHAR2                DEFAULT NULL,
    p_table_name            IN VARCHAR2                DEFAULT NULL,
    p_where_clause          IN VARCHAR2                DEFAULT NULL,
    --
    p_sql_query             IN VARCHAR2                DEFAULT NULL,
    p_plsql_function_body   IN VARCHAR2                DEFAULT NULL,
    --
    p_with_check_option     IN BOOLEAN                 DEFAULT TRUE,
    p_optimizer_hint        IN VARCHAR2                DEFAULT NULL,
    --
    p_dml_table_owner       IN VARCHAR2                DEFAULT NULL,
    p_dml_table_name        IN VARCHAR2                DEFAULT NULL,
    p_dml_plsql_code        IN VARCHAR2                DEFAULT NULL,
    --
    p_lost_update_detection IN t_lost_update_detection DEFAULT NULL,
    p_lock_rows             IN t_lock_rows             DEFAULT NULL,
    p_lock_plsql_code       IN VARCHAR2                DEFAULT NULL,
    --
    p_sql_parameters        IN t_parameters            DEFAULT c_empty_parameters ) RETURN t_context;

Parameters

Table 22-31 OPEN_LOCAL_DML_CONTEXT Function Parameters

Parameter	Description
p_columns	DML columns to pass to the data source.
p_query_type	DML columns to pass to the data source. Indicates the type of the data source: possible values are: c_query_type_table: Use a plain Table as the data source. c_query_type_sql_query: Use a SQL query as the data source. c_query_type_func_return_sql: Use the SQL query returned by the PL/SQL function.
p_table_owner	For query type TABLE: Table owner
p_table_name	For query type TABLE: Table name
p_where_clause	For query type TABLE: where clause
p_sql_query	For query type SQL QUERY: the query
p_plsql_function_body	For query type PLSQL: the PL/SQL function which returns the SQL query
p_with_check_option	Specify whether to the "WITH CHECK OPTION" should be added to the data source. If set to "true" (default), INSERTED or UPDATED rows cannot violate the where clause.
p_optimizer_hint	Optimizer hints to be added to the DML clause
p_dml_table_owner	When set, DML statements will be executed against this table
p_dml_table_name	When set, DML statements will be executed against this table
p_dml_plsql_code	Custom PL/SQL code to be executed instead of DML statements
p_lost_update_detection	lost-update detection type. Possible values are: c_lost_update_implicit: APEX calculates a checksum from the row values c_lost_update_explicit: One of the p_columns has the "is_checksum" attribute set c_lost_update_none: No lost update detection
p_lock_rows	Specify whether to lock the rows for the (short) time frame between the lost update detection and the actual DML statement. Possible values are: c_lock_rows_automatic: use a SELECT .. FOR UPDATE c_lock_rows_plsql: use custom PL/SQL code to lock the rows c_lock_rows_none: do not lock rows
p_dml_plsql_code	Custom PL/SQL code to be used to lock the rows
p_sql_parameters	Bind variables to be used

Example

The following inserts one row into the EMP table on a REST Enabled SQL Service.

declare
    l_columns        apex_exec.t_columns;
    l_context        apex_exec.t_context;
begin
    -- I. Define DML columns
    apex_exec.add_column(
       p_columns        => l_columns,
       p_column_name    => 'EMPNO',
       p_data_type      => apex_exec.c_data_type_number,
       p_is_primary_key => true );
    apex_exec.add_column(
       p_columns        => l_columns,
       p_column_name    => 'ENAME',
       p_data_type      => apex_exec.c_data_type_varchar2 );
    apex_exec.add_column(
       p_columns        => l_columns,
       p_column_name    => 'JOB',
       p_data_type      => apex_exec.c_data_type_varchar2 );
    apex_exec.add_column(
       p_columns        => l_columns,
       p_column_name    => 'HIREDATE',
       p_data_type      => apex_exec.c_data_type_date );
    apex_exec.add_column(
       p_columns        => l_columns,
       p_column_name    => 'MGR',
       p_data_type      => apex_exec.c_data_type_number );
    apex_exec.add_column(
       p_columns        => l_columns,
       p_column_name    => 'SAL',
       p_data_type      => apex_exec.c_data_type_number );
    apex_exec.add_column(
       p_columns        => l_columns,
       p_column_name    => 'COMM',
       p_data_type      => apex_exec.c_data_type_number );
    apex_exec.add_column(
       p_columns        => l_columns,
       p_column_name    => 'DEPTNO',
       p_data_type      => apex_exec.c_data_type_number );
    
    -- II. Open the context object
    l_context := apex_exec.open_local_dml_context(
       p_columns               => l_columns,
       p_query_type            => apex_exec.c_query_type_sql_query,
       p_sql_query             => 'select * from emp where deptno = 10',
       p_lost_update_detection => apex_exec.c_lost_update_none );
    
    -- III. Provide DML data
        
    apex_exec.add_dml_row(
       p_context   => l_context,
       p_operation => apex_exec.c_dml_operation_insert );
    
    apex_exec.set_value(
       p_context         => l_context,
       p_column_position => 1,
       p_value           => 4711 );
    apex_exec.set_value(
       p_context         => l_context,
       p_column_position => 2,
       p_value           => 'DOE' );
    apex_exec.set_value(
       p_context         => l_context,
       p_column_position => 3,
       p_value           => 'DEVELOPR' );
    apex_exec.set_value(
       p_context         => l_context,
       p_column_position => 4,
       p_value           => sysdate );
    apex_exec.set_value(
       p_column_position => 6,
       p_value           => 1000 );
    apex_exec.set_value(
       p_context         => l_context,
       p_column_position => 8,
       p_value           => 10 );
    
    -- IV: Execute the DML statement
        
    apex_exec.execute_dml(
       p_context           => l_context,
       p_continue_on_error => false);
    
     apex_exec.close( l_context );
exception 
    when others then
        apex_exec.close( l_context );
        raise;
            
end;

Returns

The context object representing the DML handle.