調(diào)用數(shù)據(jù)庫里的一個函數(shù)

一個函數(shù)本質(zhì)上一個返回一個結(jié)果的存儲過程，這個例子示范了怎么調(diào)用有in、out和in/out參數(shù)的函數(shù)

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CallableStatement cs;

try {

// 調(diào)用一個沒有參數(shù)的函數(shù); 函數(shù)返回 a VARCHAR

// 預(yù)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(diào)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(diào)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(diào)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) {

}