How to write the stored procedure of Oracle query

Steps: Create a database connection. Create a stored procedure, specifying the name, parameters, and SQL statement. Compile the stored procedure and check for errors. Execute the stored procedure and pass parameters. Get the results by querying the temporary table SYS_REFCURSOR.

Steps to generate Oracle query stored procedure

Step 1: Create a database connection

<code class="sql">CONN username/password@host:port/database_name</code>

Step 2: Create a stored procedure

Use the CREATE PROCEDURE statement to create a new stored procedure, specify its name, parameters and SQL statement.

<code class="sql">CREATE PROCEDURE procedure_name(
  param1 data_type,
  param2 data_type,
  ...
)
AS
BEGIN
  -- SQL 查询语句
END;</code>

Step 3: Compile the stored procedure

Compile the stored procedure using the SHOW ERRORS statement and check if there are any errors.

<code class="sql">SHOW ERRORS;</code>

Step 4: Execute the stored procedure

Use the EXEC statement to execute the stored procedure and pass the necessary parameters.

<code class="sql">EXEC procedure_name(
  param1_value,
  param2_value,
  ...
);</code>

Step 5: Get the results

The results of the stored procedure can be obtained by querying the temporary table SYS_REFCURSOR.

<code class="sql">SELECT * FROM SYS_REFCURSOR;</code>

Example:

Create a stored procedure named get_employees that returns information about all employees with a specific last name:

<code class="sql">CREATE PROCEDURE get_employees(
  surname VARCHAR2
)
AS
BEGIN
  SELECT * FROM employees
  WHERE last_name = surname;
END;</code>

Compile stored procedure:

<code class="sql">SHOW ERRORS;</code>

Execute stored procedure:

<code class="sql">EXEC get_employees('Smith');</code>

Get the result:

<code class="sql">SELECT * FROM SYS_REFCURSOR;</code>

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