Question

我在Postgres DBMS中创建了一个存储过程，并调用了该过程的Java函数。

运行Java函数后，我收到错误：

org.postgresql.util.PSQLException: L'indice de la colonne est hors limite : 1, nombre de colonnes : 0.
    at org.postgresql.core.v3.SimpleParameterList.registerOutParameter(SimpleParameterList.java:49)
    at org.postgresql.jdbc2.AbstractJdbc2Statement.registerOutParameter(AbstractJdbc2Statement.java:1968)
    at org.postgresql.jdbc3.AbstractJdbc3Statement.registerOutParameter(AbstractJdbc3Statement.java:1511)
    at DAO.FournisseurDAO.getLastId(FournisseurDAO.java:192)
    at CONTROLLER.FournisseurController.getLastIdInDataBase(FournisseurController.java:96)
    at VIEW.FournisseurUi.spinnerProperties(FournisseurUi.java:183)
    at VIEW.FournisseurUi.componentsProperties(FournisseurUi.java:139)
    at VIEW.FournisseurUi.<init>(FournisseurUi.java:100)
    at VIEW.FournisseurUi$2.run(FournisseurUi.java:542)
    at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:744)
    at java.awt.EventQueue.access$400(EventQueue.java:97)
    at java.awt.EventQueue$3.run(EventQueue.java:697)
    at java.awt.EventQueue$3.run(EventQueue.java:691)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:714)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)

以下是程序代码：

CREATE OR REPLACE FUNCTION getlastfournisseurid(OUT lastid integer)
  RETURNS integer AS
$BODY$
begin 
       select last_value into lastid from fournisseur_fournisseurid_seq ; 
end;
$BODY$
  LANGUAGE plpgsql;

这是功能代码：

public int getLastId() {
        String fournisseurLastId = "{ call getLastFournisseurId() }";
        int lastid = -1 ; 
        // Get Connection 
        Connection connecte = utility.DatabaseConnection.getInstance();

        try {
            // Create a  callableStatement
            CallableStatement clblStmt = connecte.prepareCall(fournisseurLastId);
            // Process query
            clblStmt.registerOutParameter(1, java.sql.Types.INTEGER);
            ResultSet result = clblStmt.executeQuery();
            result.next();
            lastid = clblStmt.getInt(1); 

            // close used resources             
            clblStmt.close();
        } catch (SQLException ex) {
            ex.printStackTrace();
            return -1 ; 
        } finally {
            try {
                if (connecte != null) {
                    connecte.close();
                }
            } catch (SQLException e) {
                e.printStackTrace();
            }

            return lastid;
        }
    }

Answer 1

您应该与该函数的参数进行通信（事实上，它的返回值），但您将调用定义为：

String fournisseurLastId = "{ call getLastFournisseurId() }";

您应该将其定义为：

String fournisseurLastId = "{ ? = call getLastFournisseurId() }";

否则，JDBC无法将第一个占位符注册为out参数 - 没有占位符可供注册。

Answer 2

Postgres函数只是：函数。无需使用专为真实存储过程设计的JDBC CallableStatement。

您的功能也可以简化。不需要PL / pgSQL函数。一个简单的SQL函数可以：

CREATE OR REPLACE FUNCTION getlastfournisseurid()
  RETURNS integer AS
$BODY$
    select lastvalue from fournisseur_fournisseurid_seq; 
$BODY$
  LANGUAGE sql;

（这假设表fournisseur_fournisseurid_seq中永远不会有一行，如果有，则需要在select语句中添加limit 1

然后这样称呼：

Statement stmt = connecte.createStatement();
ResultSet rs = stmt.executeQuery("select getlastfournisseurid()");
rs.next();
lastid = rs.getInt(1);

PostgreSQL存储过程无法正常工作

2 个答案: