內容或簡介：
/**
調用數據庫里的一個函數
一個函數本質上一個返回一個結果的存儲過程，這個例子示范了怎么調用有in、out和in/out參數的函數
***********************************/
CallableStatement cs;
try {
// 調用一個沒有參數的函數; 函數返回 a VARCHAR
// 預處理callable語句 
    cs = connection.prepareCall("{? = call myfunc}");

// 注冊返回值類型
    cs.registerOutParameter(1, i);

// Execute and retrieve the returned value
    cs.execute();
    String retValue = cs.getString(1);

// 調用有一個in參數的函數; the function returns a VARCHAR
    cs = connection.prepareCall("{? = call myfuncin(?)}");

// Register the type of the return value
    cs.registerOutParameter(1, Types.VARCHAR);

// Set the value for the IN parameter
    cs.setString(2, "a string");

// Execute and retrieve the returned value
    cs.execute();
    retValue = cs.getString(1);

// 調用有一個out參數的函數; the function returns a VARCHAR
    cs = connection.prepareCall("{? = call myfuncout(?)}");

// Register the types of the return value and OUT parameter
    cs.registerOutParameter(1, Types.VARCHAR);
    cs.registerOutParameter(2, Types.VARCHAR);

// Execute and retrieve the returned values
    cs.execute();
    retValue = cs.getString(1);           // return value
    String outParam = cs.getString(2);    // OUT parameter

// 調用有一個in/out參數的函數; the function returns a VARCHAR
    cs = connection.prepareCall("{? = call myfuncinout(?)}");

// Register the types of the return value and OUT parameter
    cs.registerOutParameter(1, Types.VARCHAR);
    cs.registerOutParameter(2, Types.VARCHAR);

// Set the value for the IN/OUT parameter
    cs.setString(2, "a string");

// Execute and retrieve the returned values
    cs.execute();
    retValue = cs.getString(1);           // return value
    outParam = cs.getString(2);           // IN/OUT parameter
} catch (SQLException e) {
}