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JDBC CallableStatement - Exemple de CURSOR de procédure stockée

JDBC CallableStatement - Exemple de CURSOR de procédure stockée

Un exemple JDBCCallableStatement pour appeler une procédure stockée qui renvoie un curseur.

Testé avec Java 8 et la base de données Oracle 19c

pom.xml

    
        com.oracle
        ojdbc
        8
        system
        path.to/ojdbc8.jar

1. JDBC CallableStatement

1.1 A PL/SQL stored procedure which returns a cursor.

    CREATE OR REPLACE PROCEDURE get_employee_by_name(
       p_name IN EMPLOYEE.NAME%TYPE,
       o_c_dbuser OUT SYS_REFCURSOR)
    AS
    BEGIN

      OPEN o_c_dbuser FOR
      SELECT * FROM EMPLOYEE WHERE NAME LIKE p_name || '%';

    END;

1.2 JDBC example to call above stored procedure.

StoreProcedureCursor.java

package com.example.jdbc.callablestatement;

import com.example.jdbc.model.Employee;
import oracle.jdbc.OracleTypes;

import java.math.BigDecimal;
import java.sql.*;

public class StoreProcedureCursor {

    public static void main(String[] args) {

        String createSP = "CREATE OR REPLACE PROCEDURE get_employee_by_name( "
                + " p_name IN EMPLOYEE.NAME%TYPE, "
                + " o_c_dbuser OUT SYS_REFCURSOR) "
                + " AS "
                + " BEGIN "
                + "     OPEN o_c_dbuser FOR "
                + "     SELECT * FROM EMPLOYEE WHERE NAME LIKE p_name || '%'; "
                + " END; ";

        String runSP = "{ call get_employee_by_name(?,?) }";

        try (Connection conn = DriverManager.getConnection(
                "jdbc:oracle:thin:@localhost:1521:orcl", "system", "Password123");
             Statement statement = conn.createStatement();
             CallableStatement cs = conn.prepareCall(runSP);
        ) {

            //conn.setAutoCommit(false);

            // create function
            statement.execute(createSP);

            cs.setString(1, "mk");

            // alternative
            //cs.registerOutParameter(2, Types.REF_CURSOR);
            cs.registerOutParameter(2, OracleTypes.CURSOR);

            // run SP
            cs.execute();

            // get refcursor and convert it to ResultSet
            ResultSet resultSet = (ResultSet) cs.getObject(2);
            while (resultSet.next()) {

                long id = resultSet.getLong("ID");
                String name = resultSet.getString("NAME");
                BigDecimal salary = resultSet.getBigDecimal("SALARY");
                Timestamp createdDate = resultSet.getTimestamp("CREATED_DATE");

                Employee obj = new Employee();
                obj.setId(id);
                obj.setName(name);
                obj.setSalary(salary);
                // Timestamp -> LocalDateTime
                obj.setCreatedDate(createdDate.toLocalDateTime());

                System.out.println(obj);

            }

        } catch (SQLException e) {
            System.err.format("SQL State: %s\n%s", e.getSQLState(), e.getMessage());
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }

    }
}

Télécharger le code source

$ git clone https://github.com/example/java-jdbc.git

Références

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