How to call stored procedure in oracle

Oracle, as a relational database management system, is widely used in large-scale enterprise-level applications. In order to improve the efficiency of data processing, Oracle provides the function of stored procedures. A stored procedure is a set of compiled SQL statements that can be used to operate on data like a function and can be shared and reused by multiple applications. However, for beginners who have not been exposed to Oracle stored procedures, calling stored procedures may be somewhat difficult. This article will introduce how to call Oracle stored procedures.

1. Create a stored procedure

Before introducing how to call a stored procedure, we need to first understand how to create a stored procedure. Stored procedures can be written using PL/SQL, and the general form is as follows:

CREATE OR REPLACE PROCEDURE procedure_name(parameter_1 IN data_type_1, parameter_2 OUT data_type_2)
IS
BEGIN
--SQL语句或PL/SQL代码
END procedure_name;

In this statement, CREATE OR REPLACE means to create or replace a stored procedure; PROCEDURE means to create a stored procedure; procedure_name is the name of the stored procedure; parameter_1 and parameter_2 is the input parameter and output parameter, data_type_1 and data_type_2 are data types, which can be any SQL data type; IS represents the statement block entering the stored procedure; END procedure_name represents the end of the stored procedure.

2. Call the stored procedure

After creating the stored procedure, the next step is to call the stored procedure. Oracle can call stored procedures in the following ways:

1. Use EXECUTE statement to call stored procedures

EXECUTE procedure_name(parameter_1, parameter_2);

Among them, procedure_name is the name of the stored procedure, parameter_1 is the input parameter, and parameter_2 is the output parameter.

2. Directly call the stored procedure

CALL procedure_name(parameter_1, parameter_2);

Among them, procedure_name is the name of the stored procedure, parameter_1 is the input parameter, and parameter_2 is the output parameter.

3. Use SQL*Plus to call the stored procedure

VARIABLE var_name data_type;
EXECUTE procedure_name(parameter_1, :var_name);
PRINT var_name;

Among them, var_name is the variable name and data_type is the data type; the EXECUTE statement executes the stored procedure and stores the output result in the variable In var_name; the PRINT statement prints out the variable var_name.

4. Use SQL Developer to call stored procedures

In SQL Developer, you can use the following steps to call stored procedures:

a. In Object Navigator Expand the Schema and Package where the stored procedure is located.

b. Right-click the stored procedure name and select Run.

c. Enter the value of the input parameter in the pop-up window and click OK.

d. View the output results.

3. Precautions for stored procedures

When calling a stored procedure, you need to pay attention to the following points:

1. The stored procedure name must be unique.
2. The parameters in the stored procedure must be consistent with the parameter types passed when calling the stored procedure.
3. The results cannot be displayed directly in the stored procedure, and the results need to be transferred using output parameters.
4. Exception errors may occur during the execution of stored procedures, and corresponding exception handling is required.
5. The writing of stored procedures needs to follow certain specifications to avoid grammatical errors or logical errors.

In short, stored procedures are a very important part of the Oracle database and can greatly improve the efficiency and accuracy of data processing. When using stored procedures, you need to follow corresponding specifications and precautions to ensure the correctness and stability of the program.

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