新建两个过程.
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drop procedure if exists proc1;
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drop procedure if exists proc2;
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delimiter $$
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create procedure proc1 (in para1 int , out para2 int)
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begin
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select para1 into para2;
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end $$
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create procedure proc2 (in para1 int , out para2 int)
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begin
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select para1 into para2;
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end $$
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delimiter ;
注意, 新建过程之后,没有对 li 帐号进行授权.
这时执行程序如下
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import java.sql.CallableStatement;
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import java.sql.Connection;
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import java.sql.DriverManager;
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import java.sql.SQLException;
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import java.sql.Types;
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public class T {
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public static void main(String[] args) throws SQLException, ClassNotFoundException {
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Class.forName("com.mysql.jdbc.Driver");
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Connection conn = DriverManager.getConnection("jdbc:mysql://127.0.0.1:3306/mvbox", "li", "li");
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CallableStatement cp = conn.prepareCall("{call proc1(?,?)}");
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cp.setInt(1, 1);
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cp.registerOutParameter(2, Types.INTEGER);
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cp.execute();
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System.out.println(cp.getInt(2));
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cp.close();
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conn.close();
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}
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}
执行之后,结果如下:
增加如下授权之后,再次执行
grant execute on procedure mvbox.proc1 to li@'localhost' identified by 'li';
还是报错,报错信息如下:
Exception in thread "main" java.sql.SQLException: User does not have access to metadata required to determine stored procedure parameter types. If rights can not be granted, configure connection with "noAccessToProcedureBodies=true" to have driver generate parameters that represent INOUT strings irregardless of actual parameter types.
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1094)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:997)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:983)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:928)
at com.mysql.jdbc.DatabaseMetaData.getCallStmtParameterTypes(DatabaseMetaData.java:1858)
at com.mysql.jdbc.DatabaseMetaData.getProcedureOrFunctionColumns(DatabaseMetaData.java:4508)
at com.mysql.jdbc.JDBC4DatabaseMetaData.getProcedureColumns(JDBC4DatabaseMetaData.java:106)
at com.mysql.jdbc.CallableStatement.determineParameterTypes(CallableStatement.java:857)
at com.mysql.jdbc.CallableStatement.<init>(CallableStatement.java:630)
at com.mysql.jdbc.JDBC4CallableStatement.<init>(JDBC4CallableStatement.java:46)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:408)
at com.mysql.jdbc.CallableStatement.getInstance(CallableStatement.java:524)
at com.mysql.jdbc.ConnectionImpl.parseCallableStatement(ConnectionImpl.java:4335)
at com.mysql.jdbc.ConnectionImpl.prepareCall(ConnectionImpl.java:4419)
at com.mysql.jdbc.ConnectionImpl.prepareCall(ConnectionImpl.java:4393)
at T.main(T.java:12)
这个报错信息就容易理解了,增加对proc表的select权限
grant select on mysql.proc to li@'localhost' identified by 'li';
再次执行,成功！！
这时候,如果访问proc2 过程,则报错如下:（当然会出错,因为没有对帐号li进行授权啊）
Exception in thread "main" com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: execute command denied to user 'li'@'localhost' for routine 'mvbox.proc2'
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:408)
at com.mysql.jdbc.Util.getInstance(Util.java:383)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1062)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4226)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4158)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2615)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2776)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2840)
at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2082)
at com.mysql.jdbc.PreparedStatement.execute(PreparedStatement.java:1302)
at com.mysql.jdbc.CallableStatement.execute(CallableStatement.java:921)
at T.main(T.java:15)
但是这个报错,明确显示了帐号li对于过程mvbox.proc2 没有执行权限.这样很容易定位解决问题.
在什么情况下,会因为权限不足而报Parameter number N is not an OUT parameter的错误呢?
就是该帐号没有任何execute的授权,而执行存储过程的时候,就会有上述报错.
并且仅仅是使用JDBC的途径,如果使用MySQL 的客户端,报错信息也是明确的..
MySQL JDBC的一个坑,一个专有大坑.
