今天针对JDBC中调用存储过程和存储函数进行了学习学习内容如下1.JDBC中调用存储过程调用存储过程需要用到PreparedCall专门用来处理调用存储过程和存储函数迄今为止我学了三个Connection创建的陈述对象了StatementPreparedStatement和PreparedCall三个前两个区别在于Statement是在executeQuery/ExecuteUpdate的时候进行SQL语句的执行而PreparedStatement是在初始化的时候传入SQL语句并在指定参数部位传入占位并在后续使用setObject/String/Int/Blob...进行参数设置设置好之后使用execute执行SQLStatement的执行流程是解析-编译-优化-执行就是连续下来的一个过程PreparedStatement的执行流程是解析-编译-优化-缓存执行计划然后在后续调用execute之后再执行而PreparedCall的执行则是和PreparedStatement相同只不过作用的是存储过程和存储函数罢了1调用无参的存储过程create procedure noparam() begin select * from emp; end;public class TestNoParam { public static void main(String[] args) throws SQLException { //Statement //PreparedStatement Connection connection DBUtil.getConnection(); String sql {call noparam()}; CallableStatement callableStatement connection.prepareCall(sql); callableStatement.execute();//执行了存储过程 ResultSet resultSet callableStatement.getResultSet(); //ResultSet resultSet callableStatement.executeQuery(); while (resultSet.next()) { System.out.print(resultSet.getString(1) \t); System.out.print(resultSet.getString(2) \t); System.out.print(resultSet.getString(3) \t); System.out.print(resultSet.getString(4) \t); System.out.print(resultSet.getString(5) \t); System.out.println(resultSet.getString(6) \t); } DBUtil.close(callableStatement, connection); } }2有入参的存储过程调用create procedure sell_pro(goodsId varchar(30),orderId varchar(32),n int) begin start transaction ; insert into order_info values (default,goodsId,orderId,n); update stock set numnum-n where goods_idgoodsId; insert into records values (default,goodsId,n,now()); commit ; end;public class TestInParam { public static void main(String[] args) throws SQLException { Connection connection DBUtil.getConnection(); String sql{call sell_pro(?,?,?)}; CallableStatement callableStatement connection.prepareCall(sql); callableStatement.setString(1,1001); callableStatement.setString(2,20230102); callableStatement.setInt(3,20); callableStatement.execute(); DBUtil.close(callableStatement,connection); } }3既有入参又有出参的存储过程调用create procedure add_test( a int, b int,out c int ) begin set cab; end;public class TestOutParam { public static void main(String[] args) throws SQLException { Connection connection DBUtil.getConnection(); String sql{call add_test(?,?,?)}; CallableStatement callableStatement connection.prepareCall(sql); callableStatement.setInt(1,10); callableStatement.setInt(2,20); //对应out参数的处理标注参数类型 callableStatement.registerOutParameter(3, Types.INTEGER); callableStatement.execute(); int anInt callableStatement.getInt(3); System.out.println(anInt); DBUtil.close(callableStatement,connection); } }4有特殊参数INOUT的调用create procedure mul(inout res int) begin set resres*10; end;public class TestInOutParam { public static void main(String[] args) throws SQLException { Connection connection DBUtil.getConnection(); String sql{call mul(?)}; CallableStatement callableStatement connection.prepareCall(sql); callableStatement.setInt(1,5); //对应out参数的处理标注参数类型 callableStatement.registerOutParameter(1, Types.INTEGER); callableStatement.execute(); int anInt callableStatement.getInt(1); System.out.println(anInt); DBUtil.close(callableStatement,connection); } }6存储结果查询了多个结果集create procedure selectMul(goodsId varchar(30)) begin select * from order_info where goods_id goodsId; select * from stock where goods_id goodsId; select * from records where goods_id goodsId; end;package demo; import java.sql.CallableStatement; import java.sql.Connection; import java.sql.ResultSet; /** * author djw */ public class Test5 { public static void main(String[] args) throws Exception { Connection conn DBUtil.getConnection(); CallableStatement callableStatement conn.prepareCall({call selectMul(?)}); callableStatement.setString(1, 1001); callableStatement.execute(); ResultSet rs callableStatement.getResultSet(); while(rs.next()) { for(int i 1; i rs.getMetaData().getColumnCount(); i) { System.out.print(rs.getString(i) \t); } } System.out.println(---------------------); while (callableStatement.getMoreResults()) { ResultSet resultSet callableStatement.getResultSet(); while(resultSet.next()) { for(int i 1; i resultSet.getMetaData().getColumnCount(); i) { System.out.print(resultSet.getString(i) \t); } } System.out.println(); System.out.println(--------------------); } DBUtil.close(conn, callableStatement); } }这里可以使用元数据getMetaData来获取有多少行的统计值以便于进行打印2.再创建Statement/PreparedStatement/PreparedCall的时候可以传入参数以设置结果集的可滚动性可更新性等特点3.调用函数public class TestFunction { public static void main(String[] args) throws SQLException { Connection connection DBUtil.getConnection(); //调用自定义函数 CallableStatement callableStatement connection.prepareCall({?call getHiredate(?)}); callableStatement.registerOutParameter(1, Types.DATE); callableStatement.setString(2,白居易); callableStatement.execute(); System.out.println(callableStatement.getDate(1)); DBUtil.close(callableStatement,connection); } }方式与有out参数的存储过程相似只不过语法有所改变