ORA-00903 invalid table name
ORA-00903:无效的表名
Cause A table or cluster name is invalid or does not exist. This message is also issued if an invalid cluster name or no cluster name is specified in an ALTER CLUSTER or DROP CLUSTER statement.
Action Check spelling. A valid table name or cluster name must begin with a letter and may contain only alphanumeric characters and the special characters $, _, and #. The name must be less than or equal to 30 characters and cannot be a reserved word.
原因:表名或簇名不存在或无效,当运行ALTER CLUSTER 或 DROP CLUSTER语句时,会出现此错误信息。
方案:检查拼写是否正确。一个有效的表名或簇名必须以字母开头,只含有字母或数字,不能超过30个字符,可以包含一些特殊字符$, _, #。表名或簇名不能是关键字。
案例一: 使用 DBMS_SQL包执行DDL语句
The DBMS_SQL package can be used to execute DDL statements directly from PL/SQL.
这是一个创建一个表的过程的例子。该过程有两个参数:表名和字段及其类型的列表。
CREATE OR REPLACE PROCEDURE ddlproc (tablename varchar2, cols varchar2) AS
cursor1 INTEGER;
BEGIN
cursor1 := dbms_sql.open_cursor;
dbms_sql.parse(cursor1, 'CREATE TABLE ' || tablename || '
( ' || cols || ' )', dbms_sql.v7);
dbms_sql.close_cursor(cursor1);
end;
/
SQL> execute ddlproc ('MYTABLE','COL1 NUMBER, COL2 VARCHAR2(10)');
PL/SQL procedure successfully completed.
SQL> desc mytable;
Name Null? Type
------------------------------- -------- ----
COL1 NUMBER
COL2 VARCHAR2(10)
注意:DDL语句是由Parese命令执行的。因此,不能对DDL语句使用bind变量,否则你就会受到一个错误信息。下面的在DDL语句中使用bind变量的例子是错误的。
**** Incorrect Example ****
CREATE OR REPLACE PROCEDURE ddlproc (tablename VARCHAR2,
colname VARCHAR2,
coltype VARCHAR2) AS
cursor1 INTEGER;
ignore INTEGER;
BEGIN
cursor1 := dbms_sql.open_cursor;
dbms_sql.parse(cursor1, 'CREATE TABLE :x1 (:y1 :z1)', dbms_sql.v7);
dbms_sql.bind_variable(cursor1, ':x1', tablename);
dbms_sql.bind_variable(cursor1, ':y1', colname);
dbms_sql.bind_variable(cursor1, ':z1', coltype);
ignore := dbms_sql.execute(cursor1);
dbms_sql.close_cursor(cursor1);
end;
/