如何使用spring持久性框架调用Oracle函数或存储过程？

Question

我正在为我的项目使用Spring持久性框架.我想从这个框架调用oracle函数或存储过程.

任何人都可以建议我如何实现这一目标.

请为*oracle函数和*存储过程提供解决方案.

谢谢.

Answer 1

假设您指的是JdbcTemplate:

jdbcTemplate.execute(
    new CallableStatementCreator() {
        public CallableStatement createCallableStatement(Connection con) throws SQLException{
            CallableStatement cs = con.prepareCall("{call MY_STORED_PROCEDURE(?, ?, ?)}");
            cs.setInt(1, ...); // first argument
            cs.setInt(2, ...); // second argument
            cs.setInt(3, ...); // third argument
            return cs;
        }
    },
    new CallableStatementCallback() {
        public Object doInCallableStatement(CallableStatement cs) throws SQLException{
            cs.execute();
            return null; // Whatever is returned here is returned from the jdbcTemplate.execute method
        }
    }
);

调用函数几乎完全相同:

jdbcTemplate.execute(
    new CallableStatementCreator() {
        public CallableStatement createCallableStatement(Connection con) {
            CallableStatement cs = con.prepareCall("{? = call MY_FUNCTION(?, ?, ?)}");
            cs.registerOutParameter(1, Types.INTEGER); // or whatever type your function returns.
            // Set your arguments
            cs.setInt(2, ...); // first argument
            cs.setInt(3, ...); // second argument
            cs.setInt(4, ...); // third argument
            return cs;
        }
    },
    new CallableStatementCallback {
        public Object doInCallableStatement(CallableStatement cs) {
            cs.execute();
            int result = cs.getInt(1);
            return result; // Whatever is returned here is returned from the jdbcTemplate.execute method
        }
    }
);

Answer 2

在Spring中调用Oracle函数的简单方法是继承StoredProcedure,如下所示

public class MyStoredProcedure extends StoredProcedure{
    private static final String SQL = "package.function";

    public MyStoredProcedure(DataSource ds){
        super(ds,SQL);
        declareParameter(new SqlOutParameter("param_out",Types.NUMERIC));
        declareParameter(new SqlParameter("param_in",Types.NUMERIC));
        setFunction(true);//you must set this as it distinguishes it from a sproc
        compile();
    }

    public String execute(Long rdsId){
        Map in = new HashMap();
        in.put("param_in",rdsId);
        Map out = execute(in);
        if(!out.isEmpty())
            return out.get("param_out").toString();
        else
            return null;
    }
}

并称之为这样

@Autowired DataSource ds;
MyStoredProcedure sp = new MyStoredProcedure(ds);
String i = sp.execute(1l);

这里使用的Oracle函数只接受一个数字参数并返回一个数字参数.