1. Oracle Generate Random Primary Key Examples
2. Oracle Generate Random Primary Key Mean
3. Oracle Generate Random Primary Key Definition
4. Oracle Generate Random Primary Key Mean
5. Oracle Select Primary Key
6. Add Primary Key Oracle

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4 options to generate primary keys. The JPA specification supports 4 different primary key generation strategies which generate the primary key values programmatically or use database features, like auto-incremented columns or sequences. 4 options to generate primary keys. The JPA specification supports 4 different primary key generation strategies which generate the primary key values programmatically or use database features, like auto-incremented columns or sequences.

Oracle Generate Random Primary Key Examples

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The DBMS_RANDOM package provides a built-in random number generator.

This chapter contains the following topics:

• • Operational notes

Note:

Using DBMS_RANDOM

Oracle Generate Random Primary Key Mean

Operational notes

• The RANDOM function produces integers in the range [-2^^31, 2^^31).

• The VALUE function produces numbers in the range [0,1) with 38 digits of precision.

Oracle Generate Random Primary Key Definition

DBMS_RANDOM can be explicitly initialized but does not require initialization before a call to the random number generator. It automatically initializes with the date, user ID, and process ID if no explicit initialization is performed.

If this package is seeded twice with the same seed, then accessed in the same way, it produces the same result in both cases.

In some cases, such as when testing, you may want the sequence of random numbers to be the same on every run. In that case, you seed the generator with a constant value by calling an overload of SEED. To produce different output for every run, simply omit the seed call. Then the system chooses a suitable seed for you.

Summary of DBMS_RANDOM subprograms

Table 6-1 DBMS_RANDOM package subprograms

Note:

Notes:

• The PLS_INTEGER and BINARY_INTEGER data types are identical. This document uses BINARY_INTEGER to indicate data types in reference information (such as for table types, record types, subprogram parameters, or subprogram return values), but may use either in discussion and examples.

• The INTEGER and NUMBER(38) data types are also identical. This document uses INTEGER throughout.

INITIALIZE procedure

This procedure is deprecated. Although currently supported, it should not be used. It initializes the random number generator.

Parameters

Table 6-2 INITIALIZE procedure parameters

Usage notes

This procedure is obsolete as it simply calls the SEED procedure.

NORMAL function

This function returns random numbers in a standard normal distribution.

Return value

The random number, a NUMBER value

RANDOM function

This procedure is deprecated. Although currently supported, it should not be used. It generates and returns a random number.

Return value

A random BINARY_INTEGER value greater than or equal to -power(2,31) and less than power(2,31)

Usage notes

Oracle Generate Random Primary Key Mean

See the NORMAL function and the VALUE function.

SEED procedure

This procedure resets the seed used in generating a random number.

Parameters

Table 6-3 SEED procedure parameters

Usage notes

The seed can be a string up to length 2000.

STRING function

This function generates and returns a random string.

Parameters

Table 6-4 STRING function parameters

Return value

A VARCHAR2 value with the random string

TERMINATE procedure

This procedure is deprecated. Although currently supported, it should not be used. It would be called when the user is finished with the package.

VALUE function

One version returns a random number, greater than or equal to 0 and less than 1, with 38 digits to the right of the decimal (38-digit precision). The other version returns a random Oracle Database NUMBER value x, where x is greater than or equal to the specified low value and less than the specified high value.

Parameters

Table 6-5 VALUE function parameters

Oracle Select Primary Key

Add Primary Key Oracle

Return value

A NUMBER value that is the generated random number