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Java DatabaseMetaData getProcedureColumns() method with example
This method retrieves the description of the procedure parameter and result columns of a database/catalog. It accepts 4 parameters −
catalog - A string parameter representing the name of the catalog (database in general) in which the procedure exists, pass "" to get the description of the primary key columns in tables with no catalog and, pass null if you don't want to use catalog and thus narrow the search.
schemaPattern - A String parameter representing the name (or, name pattern) of the schema, pass "" in case of no schema and, pass null if you don't want to use schema.
procedureNamePattern - A String parameter representing the name of the procedure for which you need the description.
columnNamePattern - A String parameter representing the name (or, name pattern) of the column.
This method returns a ResultSet object describing specified procedure columns. This object holds values for the following details (as column names) −
| Column name | Data type | Description |
|---|---|---|
| PROCEDURE_CAT | String | Catalog of the procedure. |
| PROCEDURE _SCHEM | String | Catalog of the schema. |
| PROCEDURE _NAME | String | Name of the procedure. |
| COLUMN_NAME | String | Name of the column/parameter name of the procedure. |
| COLUMN_TYPE | Short | Kind of the parameter (IN, OUT, INOUT, ResultSet, etc…) |
| DATA_TYPE | Int | Data type of the column as integer. |
| TYPE_NAME | String | Name of the datatype of the column. |
| PRECISION | int | precision of the column. |
| LENGTH | int | Length in bytes. |
| SCALE | short | scale. |
| RADIX | Short | radix. |
| NULLABLE | Short | Determines whether it contains null values. |
| REMARKS | String | Comments on the column. |
| COLUMN_DEF | String | Default value of the column. |
| ORDINAL_POSITION | int | Index of the column in the table. |
| IS_NULLABLE | String | Returns yes if the column contains null values, returns false if the column does not contain null values, returns an empty String (" ") if null ability of the column cannot be determined. |
| SPECIFIC_NAME | String | Name of the procedure (which identifies it uniquely). |
To get the description of the columns of a stored procedures in the database −
Make sure your database is up and running.
Register the driver using the registerDriver() method of the DriverManager class. Pass an object of the driver class corresponding to the underlying database.
Get the connection object using the getConnection() method of the DriverManager class. Pass the URL the database and, user name, password of a user in the database, as String variables.
Get the DatabaseMetaData object with respect to the current connection using the getMetaData() method of the Connection interface.
Finally, get ResultSet object holding the description of the required procedure columns, by invoking the getProcedureColumns() method of the DatabaseMetaData interface .
Example
Let us create a procedure with name myprocedure in the MySQL database using the CREATE statement as shown below −
CREATE PROCEDURE myprocedure( IN Product_Name VARCHAR(255), IN Name_Of_Customer VARCHAR(255), IN Month_Of_Dispatch VARCHAR(255), IN Price INT, IN Location VARCHAR(255)) BEGIN insert into Dispatches values ( Product_Name, Name_Of_Customer, Month_Of_Dispatch, Price, Location);
Following JDBC program establishes connection with MySQL database, retrieves the description of the procedure parameter and result columns of a catalog.
import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
public class DatabaseMetaData_getProcedureColumns {
public static void main(String args[]) throws SQLException {
//Registering the Driver
DriverManager.registerDriver(new com.mysql.jdbc.Driver());
//Getting the connection
String url = "jdbc:mysql://localhost/mydatabase";
Connection con = DriverManager.getConnection(url, "root", "password");
System.out.println("Connection established......");
//Retrieving the meta data object
DatabaseMetaData metaData = con.getMetaData();
//Retrieving the columns in the database
ResultSet rs = metaData.getProcedureColumns(null, null, "myprocedure", null);
//Printing the column name and size
while (rs.next()) {
System.out.println("Procedure name: "+rs.getString("PROCEDURE_NAME"));
System.out.println("Column name: "+rs.getString("COLUMN_NAME"));
System.out.println("Type name: "+rs.getString("TYPE_NAME"));
System.out.println("Precision: "+rs.getString("PRECISION"));
System.out.println("Radix: "+rs.getString("RADIX"));
System.out.println(" ");
}
}
}Output
Connection established...... Procedure name: myprocedure Column name: Product_Name Type name: VARCHAR Precision: 255 Radix: 10 Procedure name: myprocedure Column name: Name_Of_Customer Type name: VARCHAR Precision: 255 Radix: 10 Procedure name: myprocedure Column name: Month_Of_Dispatch Type name: VARCHAR Precision: 255 Radix: 10 Procedure name: myprocedure Column name: Price Type name: INT Precision: 10 Radix: 10 Procedure name: myprocedure Column name: Location Type name: VARCHAR Precision: 255 Radix: 10
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