本文给出了读写Oracle的特殊数据类型STRUCT和VARRAY的操作方法。
首先，创建类型
CREATE TYPE Struct_Test AS OBJECT(s VARCHAR(30), i NUMBER);
CREATE TYPE number_varray AS VARRAY(10) OF NUMBER(12, 2);
然后，创建表
CREATE TABLE test(i NUMBER, obj Struct_Test);
REATE TABLE VARRAY_TABLE(col_number_array number_varray)
然后，插入数据
//插入STRUCT数据
Object[] values = new Object[]{”str”, new BigDecimal(123)};
oracle.sql.StructDescriptor structDesc = oracle.sql.StructDescriptor.createDescriptor(”Struct_Test”, cn);
oracle.sql.STRUCT oracleStruct = new oracle.sql.STRUCT(structDesc, cn, values);
// Create a prepared statement for insertion into test
PreparedStatement ps = connection.prepareStatement(”INSERT INTO test VALUES(?,?)”);
// Set the values to insert
ps.setInt(1, 123);
ps.setObject(2, oracleStruct);
// Insert the new row
ps.execute();
//插入VARRAY数据
// Create an oracle.sql.ARRAY object to hold the values
oracle.sql.ArrayDescriptor arrayDesc = oracle.sql.ArrayDescriptor.createDescriptor(”number_varray”, connection);
int arrayValues[] = {123, 234};
oracle.sql.ARRAY array = new oracle.sql.ARRAY(arrayDesc, cn, arrayValues);
// Create a prepared statement for insertion into varray_table
PreparedStatement ps = cn.prepareStatement(”INSERT INTO varray_table VALUES(?)”);
// Set the values to insert
((oracle.jdbc.driver.OraclePreparedStatement)ps).setARRAY(1, array);
// Insert the new row
ps.execute();
最后，读取数据
//读取STRUCT数据
ResultSet resultSet = stmt.executeQuery(”SELECT * FROM test”);
while (resultSet.next()) {
// Get the Struct_Test value from the second column obj
oracle.sql.STRUCT oracleStruct = (oracle.sql.STRUCT)resultSet.getObject(2);
// Get the object1 values from each row
Object[] values = oracleStruct.getAttributes();
// Get the first value of object1, which is a string
String str = (String)values[0];
BigDecimal i = (BigDecimal)values[1];
}
//读取VARRAY数据
// Create a statement
Statement stmt = cn.createStatement();
// Select rows from varray_table
ResultSet resultSet = stmt.executeQuery(”SELECT * FROM varray_table”);
// Get the VARRAY values from each row
while (resultSet.next()) {
// Get the VARRAY value in the first column
oracle.sql.ARRAY array = ((oracle.jdbc.driver.OracleResultSet)resultSet).getARRAY(1);
// Get the VARRAY elements; values.length is the number of values in the VARRAY
java.math.BigDecimal[] values = (java.math.BigDecimal[])array.getArray();
}
注意：乱码问题，依赖于nls_charset12.jar，否则字符串类型的数据是乱码，插入失败，读取出来是null
请将nls_charset12.jar放于classpath下即可。
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- Creates VARRAYs of different lengths.
- Contains a table to store data of above array type.
- Stores the objects in an array.Inserts them into database table in two different ways (with SQL and ArrayDescriptor).</LI itxtHarvested="0" itxtNodeId="459">
import java.sql.*;
import oracle.sql.*;
import oracle.jdbc.oracore.Util;
import oracle.jdbc.*;
public class VArrayManipulation
{
public static void main (String args[])
throws Exception
{
DriverManager.registerDriver(new oracle.jdbc.OracleDriver());
// The sample retrieves an varray of type "STRING_VARRAY",
// materializes the object as an object of type ARRAY.
// A new ARRAY is then inserted into the database.
String url = "<connection url>";
// Connect to the database
Connection conn =
DriverManager.getConnection (url, "<user>" , "<password>");
conn.setAutoCommit (false);
// Create a Statement
Statement stmt = conn.createStatement ();
try
{
stmt.execute ("DROP TABLE sample_varray_table");
stmt.execute ("DROP TYPE string_varray");
}
catch (SQLException e)
{
//Exceptions will be thrown if Table and types doesnt exist . Ignore this
}
stmt.execute ("CREATE TYPE string_varray AS VARRAY(10) OF VARCHAR2(100)");
stmt.execute ("CREATE TABLE sample_varray_table (acol string_varray)");
//Insert using SQL
stmt.execute ("INSERT INTO sample_varray_table VALUES (string_varray('Test1', 'Test2'))");
ResultSet rs = stmt.executeQuery("SELECT acol FROM sample_varray_table");
printResultSet (rs);
//Insert using ArrayDescriptor
// create a new ARRAY object
String arrayElements[] = { "Test3", "Test4" };
ArrayDescriptor desc = ArrayDescriptor.createDescriptor
("STRING_VARRAY", conn);
ARRAY newArray = new ARRAY(desc, conn, arrayElements);
PreparedStatement ps =
conn.prepareStatement ("insert into sample_varray_table values (?)");
((OraclePreparedStatement)ps).setARRAY (1, newArray);
ps.execute ();
rs = stmt.executeQuery("SELECT acol FROM sample_varray_table");
printResultSet (rs);
// Close all the resources
rs.close();
ps.close();
stmt.close();
conn.close();
}
public static void printResultSet (ResultSet rs)
throws SQLException
{
System.out.println("********Fetch Starts....********");
int line = 0;
while (rs.next())
{
line++;
System.out.println("********Row "+line+" : ");
ARRAY array = ((OracleResultSet)rs).getARRAY (1);
System.out.println ("Array is of type "+array.getSQLTypeName());
System.out.println ("Array is of length "+array.length());
// get Array elements
String[] values = (String[]) array.getArray();
for (int i=0; i<values.length; i++)
{
System.out.println("index "+i+" = "+values[i] );
}
}
System.out.println("********Fetch Ends....********");
}
}
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如何在JAVA程序中使用Struct一次传入多条数据给Oracle的存储过程。
为了减少连接Oracle数据库的数量，需要将多条数据作为变量一次传入Oracle的存储过程中。方法如下：
步骤一：定义对象类型。
CREATE TYPE department_type AS OBJECT (
DNO NUMBER (10),
NAME VARCHAR2 (50),
LOCATION VARCHAR2 (50)
);
步骤二：定义一个对象类型的数组对象。
CREATE TYPE dept_array AS TABLE OF department_type;
步骤三：定义存储过程来插入数据。
CREATE OR REPLACE PACKAGE objecttype AS
PROCEDURE insert_object (d dept_array);
END objecttype;
CREATE OR REPLACE PACKAGE BODY objecttype
AS
PROCEDURE insert_object (d dept_array)
AS
BEGIN
FOR i IN d.FIRST..d.LAST
LOOP
INSERT INTO department_teststruct
VALUES (d(i).dno,d(i).name,d(i).location);
END LOOP;
END insert_object;
END objecttype;
步骤四（可选步骤，即可以不做）：定义一个Java class来映射对象中类型。
步骤五：定义Java方法来调用存储过程。
import java.sql.Connection;
import java.sql.DriverManager;
import oracle.jdbc.OracleCallableStatement;
import oracle.sql.ARRAY;
import oracle.sql.ArrayDescriptor;
import oracle.sql.STRUCT;
import oracle.sql.StructDescriptor;
public class TestStruct ...{
public static void main(String[] args)
...{
sendStruct();
}
public static void sendStruct()
...{
Connection dbConn = null;
try...{
Object[] so1 = ...{"10","Accounts","LHR"};
Object[] so2 = ...{"20","HR","ISB"};
OracleCallableStatement callStatement = null;
Class.forName("oracle.jdbc.driver.OracleDriver");
dbConn = DriverManager.getConnection("jdbc:oracle:thin:@ServerName:Port:ORa", "UserName", "Password");
StructDescriptor st = new StructDescriptor("DEPARTMENT_TYPE",dbConn);
STRUCT s1 = new STRUCT(st,dbConn,so1);
STRUCT s2 = new STRUCT(st,dbConn,so2);
STRUCT[] deptArray = ...{s1,s2};
ArrayDescriptor arrayDept = ArrayDescriptor.createDescriptor("DEPT_ARRAY", dbConn);
ARRAY deptArrayObject = new ARRAY(arrayDept, dbConn, deptArray);
callStatement = (OracleCallableStatement)dbConn.prepareCall("{call insert_object(?)}");
((OracleCallableStatement)callStatement).setArray(1, deptArrayObject);
callStatement.executeUpdate();
dbConn.commit();
callStatement.close();
}
catch(Exception e)...{
System.out.println(e.toString());
}
}
}
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