MySQL：如何编写Information Schema Plugin(10)

#include <mysql_priv.h> 

#include <mysql/plugin.h> 

#include <my_global.h> 

#include <mysql_version.h> 

#include <my_dir.h> 

/*创建一个子类，query_cache的成员queries为私有变量

class Accessible_Query_Cache : privateQuery_cache {

public:

 HASH *get_queries()

  {

   return &this->queries; //&query_cache.queries;

  }

};

bool schema_table_store_record(THD *thd,TABLE *table);

#define MAX_STATEMENT_TEXT_LENGTH 32767

#define COLUMN_STATEMENT_ID 0

#define COLUMN_SCHEMA_NAME 1

#define COLUMN_STATEMENT_TEXT 2

#define COLUMN_RESULT_BLOCKS_COUNT 3

#define COLUMN_RESULT_BLOCKS_SIZE 4

#define COLUMN_RESULT_BLOCKS_SIZE_USED 5

/* 定义表结构*/ 

ST_FIELD_INFOmysql_is_cached_queries_fields[]= 

{ 

 {"STATEMENT_ID", 21, MYSQL_TYPE_LONG, 0, 0, "Id"}, 

 {"SCHEMA_NAME", 64, MYSQL_TYPE_STRING, 0, 0,"Schema"}, 

 {"STATEMENT_TEXT", MAX_STATEMENT_TEXT_LENGTH,MYSQL_TYPE_STRING, 0, 0, "Statment text"}, 

 {"RESULT_BLOCKS_COUNT", 21, MYSQL_TYPE_LONG, 0, 0, "CountResult Blocks"}, 

 {"RESULT_BLOCKS_SIZE", 21, MYSQL_TYPE_LONGLONG, 0, 0,"Size Result Blocks"}, 

 {"RESULT_BLOCKS_SIZE_USED", 21, MYSQL_TYPE_LONGLONG, 0, 0,"Size Used Result Blocks"}, 

  {0,0, MYSQL_TYPE_STRING, 0, 0, 0} 

}; 

/*填充数据函数*/ 

static intmysql_is_cached_queries_fill_table(THD *thd, TABLE_LIST *tables, COND *cond) 

{ 

  intstatus;                                

 CHARSET_INFO *scs= system_charset_info;  /* need this to store field into table */ 

 TABLE *table= (TABLE *)tables->table;     

 Accessible_Query_Cache *qc; 

 HASH *queries; 

 const uchar *query_cache_block_raw; 

 Query_cache_block* query_cache_block; 

 Query_cache_query* query_cache_query; 

 uint result_blocks_count; 

 ulonglong result_blocks_size; 

 ulonglong result_blocks_size_used; 

 Query_cache_block *first_result_block; 

 Query_cache_block *result_block; 

 const char *statement_text; 

 size_t statement_text_length;