将数组从Java传递到Oracle：java.sql.SQLException：无法转换为内部表示：error

我在DAO中有以下内容，当我执行时，我得到了

java.sql.SQLException：无法转换为内部表示forms：test.Project@843

DAO代码

List projectList = new LinkedList(); public void saveRecord(List project) throws DatabaseException,SQLException { for (Project items: project) { insertRecord(items); } } private void insertRecord(Project project) throws SQLException { projectList.add(project); try{ ArrayDescriptor desc = ArrayDescriptor.createDescriptor("MY_ARRAY", dbConn); // execpetion in this line ARRAY arr = new ARRAY(desc, dbConn, (Object[])projectList.toArray()); 

我该如何解决这个问题？

编辑1

 CREATE OR REPLACE TYPE project_type as object( proj_id varchar2 (10), proj_title varchar2 (10)); create or replace type my_array as Table of project_type; 

Answer 1

不幸的是，这比人们预期的要复杂得多。 您必须使用STRUCT对象，描述符，最后使用ARRAY 。 下面是一个工作示例。

 -- Database code -- CREATE TABLE project_types ( proj_id VARCHAR2(10), proj_title VARCHAR2(10) ); / CREATE OR REPLACE TYPE project_type AS OBJECT ( proj_id VARCHAR2(10), proj_title VARCHAR2(10) ); / CREATE OR REPLACE TYPE my_array AS TABLE OF project_type; / CREATE OR REPLACE PROCEDURE add_projects(p_projects_array IN my_array) AS BEGIN IF p_projects_array IS NOT NULL THEN FOR v_i IN 1..p_projects_array.LAST LOOP INSERT INTO project_types VALUES (p_projects_array(v_i).proj_id, p_projects_array(v_i).proj_title); END LOOP; END IF; END; / 

 // Java code - main class import java.sql.Connection; import java.sql.DriverManager; import oracle.jdbc.OracleCallableStatement; import oracle.jdbc.OracleConnection; import oracle.sql.ARRAY; import oracle.sql.ArrayDescriptor; import oracle.sql.STRUCT; import oracle.sql.StructDescriptor; public class ArrayExampleMain { public static void main(String[] args) throws Exception { OracleConnection conn = getOracleConnection().unwrap(OracleConnection.class); System.out.println("Got Connection."); OracleCallableStatement callStmt = null; try { callStmt = (OracleCallableStatement)conn.prepareCall("{call add_projects(?)}"); // create array holding values for ProjectType object's properties Object[] project1 = new Object[] {"1", "Title 1"}; Object[] project2 = new Object[] {"2", "Title 2"}; // descriptor for OBJECT type defined in database StructDescriptor projectTypeDesc = StructDescriptor.createDescriptor("PROJECT_TYPE", conn); // each struct is one ProjectType object STRUCT structProject1 = new STRUCT(projectTypeDesc, conn, project1); STRUCT structProject2 = new STRUCT(projectTypeDesc, conn, project2); STRUCT[] structArrayOfProjects = {structProject1, structProject2}; // descriptor of TABLE type defined in database ArrayDescriptor projectTypeArrayDesc = ArrayDescriptor.createDescriptor("MY_ARRAY", conn); // array holding two ProjectType objects ARRAY arrayOfProjects = new ARRAY(projectTypeArrayDesc, conn, structArrayOfProjects); callStmt.setARRAY(1, arrayOfProjects); callStmt.execute(); conn.commit(); System.out.println("Committed."); } catch (Exception e) { if (conn != null) try { conn.rollback(); } catch (Exception ex) { System.out.println("Rollback failed."); } throw e; } finally { callStmt.close(); conn.close(); } } public static Connection getOracleConnection() throws Exception { String driver = "oracle.jdbc.driver.OracleDriver"; String url = "jdbc:oracle:thin:@YOUR_HOST:orcl"; String username = "hr"; String password = "password"; Class.forName(driver); // load Oracle driver Connection conn = DriverManager.getConnection(url, username, password); return conn; } } 

执行主类后检查project_types表的内容：

 SELECT * FROM project_types; 

输出：

  PROJ_ID PROJ_TITLE
 ---------- ----------
 1标题1    
 2标题2 

Answer 2

谢谢，@ PrzemyslawKruglej。 我冒昧地清理了已弃用的课程。

 import java.sql.Array; import java.sql.Connection; import java.sql.DriverManager; import java.sql.Struct; import oracle.jdbc.OracleCallableStatement; import oracle.jdbc.OracleConnection; public class ArrayExampleMain { public static void main(String[] args) throws Exception { OracleConnection conn = getOracleConnection().unwrap(OracleConnection.class); System.out.println("Got Connection."); OracleCallableStatement callStmt = null; try { callStmt = (OracleCallableStatement)conn.prepareCall("{call add_projects(?)}"); // create array holding values for ProjectType object's properties Object[] project1 = new Object[] {"1", "Title 1"}; Object[] project2 = new Object[] {"2", "Title 2"}; // each struct is one ProjectType object Struct structProject1 = conn.createStruct("PROJECT_TYPE", project1); Struct structProject2 = conn.createStruct("PROJECT_TYPE", project2); Struct[] structArrayOfProjects = {structProject1, structProject2}; // array holding two ProjectType objects Array arrayOfProjects = conn.createOracleArray("MY_ARRAY", structArrayOfProjects); callStmt.setArray(1, arrayOfProjects); callStmt.execute(); conn.commit(); System.out.println("Committed."); } catch (Exception e) { if (conn != null) try { conn.rollback(); } catch (Exception ex) { System.out.println("Rollback failed."); } throw e; } finally { callStmt.close(); conn.close(); } } public static Connection getOracleConnection() throws Exception { String driver = "oracle.jdbc.driver.OracleDriver"; String url = "jdbc:oracle:thin:@YOUR_HOST:orcl"; String username = "hr"; String password = "password"; Class.forName(driver); // load Oracle driver Connection conn = DriverManager.getConnection(url, username, password); return conn; } }