hk2000c技術專欄

內容或簡介：
/**
調用數(shù)據(jù)庫里的一個函數(shù)
一個函數(shù)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(shù)的函數(shù)
***********************************/
CallableStatement cs;
try {
// 調用一個沒有參數(shù)的函數(shù); 函數(shù)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(shù)的函數(shù); 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(shù)的函數(shù); 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(shù)的函數(shù); 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) {
}