Dynamic SQL

You are now ready to switch the SQL execution mode for your selected SQL statements from dynamic SQL to static SQL execution.

SET options that are set by a user within a dynamic SQL batch apply only for the duration of that batch .

The package cache sets the amount of database global memory to be used for caching a package's static and dynamic SQL statements.

The risk of SQL injection attacks is not the only reason to avoid dynamic SQL.

SET options set within a dynamic SQL batch affect only the scope of that batch.

Moreover, entities referenced through dynamic SQL do not establish dependencies.

When the stored strings are subsequently concatenated into a dynamic SQL command , the malicious code is executed .

Check that the cache size is sufficiently large and that the cache hit ratio is high for each of the dynamic SQL statements being executed.

If you use dynamic SQL, be sure to parameterize your commands, and never include parameter values directly into a query string.

Often the SQL statements are dynamic in nature, and dynamic SQL access techniques, like the DB2 CLI API, are favored.

Additionally, rerun the Design Advisor against the dynamic SQL cache populated by a full scale application test.

This means that the use of dynamic SQL can force you to grant users permission to directly access base tables.

JDBC is a vendor-neutral dynamic SQL interface that provides data access to your application through standardized Java methods.

However, JDBC provides finer-grained control over the execution of SQL statements and offers true dynamic SQL capability.

Using dynamic SQL results in a minor performance hit, but it is much faster than running the same query using a generated ABAP function.

For an overview of the sequence of operations required for any SQL operation, see Using dynamic SQL.

WebSphere MQ Integrator uses Dynamic SQL to process each of the database calls within a message flow.

The content of a particular report is determined by a dynamic SQL query to one or more data sources.

It also provides the default value to the CURRENT FEDERATED ASYNCHRONY special register for dynamic SQL statements.

However, ownership chaining doesn't work if objects have different owners or in the case of dynamic SQL.

Dynamic SQL is an ideal candidate for creating generic database handlers.

In the handler application, fixed-list dynamic SQL would be used with the structure based method.

Dynamic SQL needs to be prepared execution by the UDB optimizer in order to create an access plan for the statement.

Dynamic SQL statements automatically use these updated statistics.

This is in contrast to a dynamic SQL statement, whose syntax is not known until run-time.

For dynamic SQL applications, use the APPLICATION ENCODING special register to override the CCSID.

The section " Static and Dynamic SQL considerations" covers package concepts in more detail.

Varying-list dynamic SQL is typically used when an application builds the entire SQL statement from scratch.

Set the special register CURRENT EXPLAIN SNAPSHOT to YES to capture the snapshot for dynamic SQL statements.

Describes techniques for writing secure dynamic SQL using stored procedures.

Synonyms can be created, dropped and referenced in dynamic SQL.

For dynamic SQL statements, the SQL string argument is captured from the statement execution call before the monitoring advice uses it.

For dynamic SQL statements, authorization takes place on a per statement basis.

By setting the special register, an Explain snapshot will be taken for any subsequent eligible dynamic SQL statements.

Here's a subset of a dynamic SQL snapshot entry for a CLI array insert of 100, 000 rows.

The following example demonstrates how a synonym can be referenced in dynamic SQL.

Use ULPreparedStatement and Dynamic SQL when you want relatively fast DML over multiple rows.

An SQL descriptor is not required when using fixed-list dynamic SQL.

The command is specified for dynamic SQL and optimistic concurrency.

With DB2 9 and dynamic SQL, REOPT ALWAYS can also be specified through a global- or statement-level optimization profile.

The statement-based handler is better suited for varying-list style dynamic SQL.

dbExpress is a cross-platform interface for processing dynamic SQL from Delphi (or Borland KylixTM).

The code and tests you write against your data model classes can stay the same regardless of whether you use dynamic SQL or SPROCs.

The caller's default schema if executed in a batch or in dynamic SQL.

Avoid dynamic SQL unless absolutely necessary.

DISTINCT column-name cannot be used from dynamic SQL.

Also, by using static SQL you reduce the opportunity for malicious injection, which is a well-known security issue with dynamic SQL.

The following is a convenient reference for finding functions in dynamic SQL.

This section describes data access using dynamic SQL.

While you can return multiple resultsets using dynamic SQL, I prefer to use stored procedures.

Dynamic SQL supports the operators listed in this section.

Although using a string variable is easier, you might need to use an internal table if a remote function call sends the dynamic SQL code.

Use parameterized commands and avoid dynamic SQL statements.

The following example shows how SHOWPLAN permissions are checked for dynamic SQL statements.

So, to form the habit of guarding your database, avoid dynamic SQL code as much as possible.

The following search conditions are supported in dynamic SQL.

The components provide access to dynamic SQL.

Listing 7 shows the section in the Dynamic SQL snapshot output for this query.

If you can't avoid dynamic SQL code, don't use input directly for columns.

The security model for static SQL is also different than for dynamic SQL.

Dynamic SQL is characterized by its ability to change columns, tables, and predicates during a program's execution.

First, we will compose a dynamic SQL statement with five parameter markers.

Dynamic SQL can be used from UltraLite components, but not from static development models.

Tuning dynamic SQL queries was taking more time and effort for the Senate DBA group.

The default NULLID package set is used to execute dynamic SQL statements.

For information on dynamic SQL, see Static and dynamic SQL.

I normally look at views of elapsed times and CPU times for dynamic SQL.

Therefore, a SET OFFSETS statement specified in dynamic SQL does not have any effect on any statements following the dynamic SQL statement.

This is how Bonita lets you write dynamic SQL queries that are decided at run time.

Patterns can be transactional or non-transactional, and they can support dynamic SQL or stored procedures.

This section explains how to perform the following tasks using dynamic SQL.

UltraLite applications can access table data using dynamic SQL or the Table API.

For dynamic SQL, set the sqltype field to DT_LONGVARCHAR or DT_LONGBINARY as appropriate.

There are some differences in the way privileges are handled between static and dynamic SQL.

Package Type the name of the package that the driver uses to process dynamic SQL for applications that use this data source definition.

However, if BARBARA used the following BIND command to bind the file, the privileges of the package owner would be checked for dynamic SQL

We have extracted three sections of the dynamic SQL snapshot corresponding to three different queries

JDBC offers two possibilities to execute a dynamic SQL statement and, therefore, provides two different interfaces

The steps in executing dynamic SQL statements are common to all components

dynamic SQL (Structured Query Language)

Accessing and manipulating data using dynamic SQL

However, the following dynamic SQL statement is replicated

Better security (less risk of dynamic SQL injection)

Setting re-optimization (REOPT) level for dynamic SQL statements

Use the Parameters Collection with Dynamic SQL

The Creation of Dynamic SQL Searching String

Working with data using dynamic SQL

For example, suppose the application file in the example above also contained dynamic SQL, as shown in Listing 2

get snapshot for dynamic sql on dbname