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[英]Java Servlet error in throwing exceptions for doGet( ) calling stored procedure
[英]Calling Firebird Stored procedure from Java Servlet
我有一個帶有某些存儲過程的Firebird數據庫,並且正在開發Java Web /數據庫應用程序。 我想知道是否有可能,以及如何從Java類或Servlet調用那些存儲過程。
例:
deletep
,用於從數據庫中刪除行 要用Java執行Firebird存儲過程,有幾種方法。 JDBC-default方法類似於:
try (CallableStatement cstmt = connection.prepareStatement(
"{call yourProcedure(?, ?, ?)}")) {
cstmt.setString(1, "value1");
cstmt.setString(2, "value2");
cstmt.setString(3, "value3");
cstmt.execute();
}
如果Firebird存儲過程是可選的(即:包含SUSPEND
並可以返回多行),則需要執行以下操作:
try (CallableStatement cstmt = connection.prepareStatement(
"{call yourProcedure(?, ?, ?)}")) {
cstmt.setString(1, "value1");
cstmt.setString(2, "value2");
cstmt.setString(3, "value3");
try (ResultSet rs = cstmt.executeQuery()) {
while(rs.next()) {
// do something with result set rows ...
}
}
}
如果存儲過程是可執行的並且不返回任何值,這就足夠了。 如果存儲過程是可執行的(帶有(多個)返回列),則需要執行以下操作:
try (CallableStatement cstmt = connection.prepareStatement(
"{call yourProcedure(?, ?, ?, ?, ?)}")) {
cstmt.setString(1, "value1");
cstmt.setString(2, "value2");
cstmt.setString(3, "value3");
cstmt.registerOutParameter(4, Types.VARCHAR);
cstmt.registerOutParameter(5, Types.VARCHAR)
cstmt.execute();
String out1 = cstmt.getString(4);
String out2 = cstmt.getString(5);
// do something with result
}
或者,您可以使用Firebird特定的語法EXECUTE PROCEDURE yourProcedure(?, ?, ?)
用於可執行存儲過程,並使用SELECT * FROM yourProcedure(?, ?, ?)
。
使用Firebird JDBC驅動程序Jaybird可以做到這一點。
三個步驟:
創建一個DBUtil Java類以存儲查詢:
public static void deletePlan(Connection conn, CallableStatement statement, String code, String rev, String mention) throws SQLException { statement.setString(1, code); statement.setString(2, rev); statement.setString(3, mention); statement.execute(); }
創建刪除servlet
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { Connection conn = MyUtils.getStoredConnection(request); String code = request.getParameter("code"); String rev = request.getParameter("revision"); String mention = request.getParameter("mention"); CallableStatement statement = null; try { statement = conn.prepareCall("execute procedure DELETEP(?,?,?)"); } catch (SQLException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } String errorString = null; try { DBUtils.deletePlan(conn, statement, code, rev, mention); } catch (SQLException e) { e.printStackTrace(); errorString = e.getMessage(); } .........
在jsp文件中創建刪除鏈接
<a href="${pageContext.request.contextPath}/deletePlan code=${plan.code}&revision=${plan.revision}&mention=${plan.mention}">Delete</a>
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