Question

此问题与我的原始问题How to return an array from Java to PL/SQL ?有关，但更为具体。

我一直在阅读Oracle Database JDBC Developer's Guide和

但我仍然无法编写最小代码，我可以使用

创建ARRAY

ARRAY array = oracle.jdbc.OracleConnection.createARRAY(sql_type_name, elements);

按照Creating ARRAY objects的说明。

我正在使用Oracle数据库JVM。

我试过以下：

示例1

create or replace type widgets_t is table of varchar2(32767);
/

create or replace and compile java source named "so20j1" as
public class so20j1 {
    public void f1() {
        String[] elements = new String[]{"foo", "bar", "zoo"};
        oracle.sql.ARRAY widgets =
            oracle.jdbc.OracleConnection.createARRAY("widgets_t", elements);
    }
};
/
show errors java source "so20j1"

失败：

Errors for JAVA SOURCE "so20j1":

LINE/COL ERROR
-------- -----------------------------------------------------------------
0/0  so20j1:4: non-static method
     createARRAY(java.lang.String,java.lang.Object) cannot be
     referenced from a static context

0/0  1 error
0/0  ^
0/0  oracle.sql.ARRAY widgets =
     oracle.jdbc.OracleConnection.createARRAY("widgets_t", elements);

示例2

create or replace type widgets_t is table of varchar2(32767);
/

create or replace and compile java source named "so20j2" as

public class so20j2 {
    public void f1() {
        String[] elements = new String[]{"foo", "bar", "zoo"};
        oracle.jdbc.OracleDriver ora = new oracle.jdbc.OracleDriver();
        java.sql.Connection conn = ora.defaultConnection();
        oracle.sql.ARRAY widgets = conn.createARRAY("widgets_t", elements);
    }
};
/
show errors java source "so20j2"

失败：

Errors for JAVA SOURCE "so20j2":

LINE/COL ERROR
-------- -----------------------------------------------------------------
0/0  so20j2:6: cannot find symbol
0/0  symbol  : method createARRAY(java.lang.String,java.lang.String[])
0/0  1 error
0/0  oracle.sql.ARRAY widgets = conn.createARRAY("widgets_t",
     elements);

0/0  ^
0/0  location: interface java.sql.Connection

免责声明：我还不是Java程序员。

Answer 1

您使用＃2处于正确的轨道上，但无法从类型为java.sql.Connection的连接创建oracle阵列。它必须是OracleConnection才能使用这些方法。

oracle.jdbc.OracleDriver ora = new oracle.jdbc.OracleDriver();
java.sql.Connection conn = ora.defaultConnection();
OracleConnection oraConn = conn.unwrap(OracleConnection.class);
oracle.sql.ARRAY widgets = oraConn.createARRAY("widgets_t", elements);

Answer 2

基于Affe和Chris Mazzola的答案，我成功构建了两个在Oracle 11g R2数据库中编译的示例。

基于Affe答案的示例

create or replace type widgets_t is table of varchar2(32767);
/

create or replace and compile java source named "so20ja1" as
public class so20ja1 {
    public void f1() throws java.sql.SQLException {
        String[] elements = new String[]{"foo", "bar", "zoo"};
        oracle.jdbc.OracleDriver ora = new oracle.jdbc.OracleDriver();
        java.sql.Connection conn = ora.defaultConnection();
        oracle.jdbc.OracleConnection oraConn = (oracle.jdbc.OracleConnection)conn;
        java.sql.Array widgets = oraConn.createARRAY("widgets_t", elements);
    }
};
/
show errors java source "so20ja1"

基于Chris Mazzola答案的示例

create or replace type widgets_t is table of varchar2(32767);
/

create or replace and compile java source named "so20ja2" as
public class so20ja2 {
    public void f1() throws java.sql.SQLException {
        String[] elements = new String[]{"foo", "bar", "zoo"};
        oracle.jdbc.OracleDriver ora = new oracle.jdbc.OracleDriver();
        java.sql.Connection conn = ora.defaultConnection();
        oracle.sql.ArrayDescriptor desc = 
            oracle.sql.ArrayDescriptor.createDescriptor("widgets_t", conn);
        java.sql.Array widgets = new oracle.sql.ARRAY(desc, conn, elements);
    }
};
/
show errors java source "so20ja2"

Answer 3

// array sample (using a stored procedure to sum two or more numbers)
Connection connection = dataSource.getConnection(username,password);
ArrayDescriptor desc = 
    ArrayDescriptor.createDescriptor(schemaName + "." + arrayType, connection);

// first ? is the array, second ? is the result via out parameter
String sql = "call sum_numbers(?,?)";
CallableStatement cs = connection.prepareCall(sql);

String[] args = {"5","15","25","35"}; // what to sum
Array array = new oracle.sql.ARRAY(desc, connection, args);

cs.setArray(1, array);
cs.registerOutParameter(2, Types.INTEGER);
cs.execute();
int result = cs.getInt(2);
cs.close();

Answer 4

请注意，在Java 1.6中，您有connection.createArrayOf(..)，这是标准的。

如何创建oracle.sql.ARRAY对象？

4 个答案: