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00021 #pragma once
00022
00023 #include <drizzled/field/str.h>
00024 #include <string>
00025
00026 namespace drizzled
00027 {
00028
00029 class Field_varstring :public Field_str {
00030 public:
00031
00032 using Field::store;
00033 using Field::pack;
00034 using Field::unpack;
00035 using Field::val_int;
00036 using Field::val_str;
00037
00038
00039
00040
00041
00042 static const uint32_t MAX_SIZE;
00043 private:
00044
00045 uint32_t length_bytes;
00046 public:
00047 Field_varstring(unsigned char *ptr_arg,
00048 uint32_t len_arg,
00049 uint32_t length_bytes_arg,
00050 unsigned char *null_ptr_arg,
00051 unsigned char null_bit_arg,
00052 const char *field_name_arg,
00053 const CHARSET_INFO * const cs);
00054 Field_varstring(uint32_t len_arg,
00055 bool maybe_null_arg,
00056 const char *field_name_arg,
00057 const CHARSET_INFO * const cs);
00058
00059 enum_field_types type() const { return DRIZZLE_TYPE_VARCHAR; }
00060 enum ha_base_keytype key_type() const;
00061 bool zero_pack() const { return 0; }
00062 int reset(void) { memset(ptr, 0, field_length+length_bytes); return 0; }
00063 uint32_t pack_length() const { return (uint32_t) field_length+length_bytes; }
00064 uint32_t pack_length_no_ptr() const { return length_bytes; }
00065 uint32_t key_length() const { return (uint32_t) field_length; }
00066 uint32_t sort_length() const
00067 {
00068 return (uint32_t) field_length + (field_charset == &my_charset_bin ?
00069 length_bytes : 0);
00070 }
00071 int store(const char *to,uint32_t length, const CHARSET_INFO * const charset);
00072
00073
00074 int store(int64_t nr, bool unsigned_val);
00075 int store(double nr) { return Field_str::store(nr); }
00076 double val_real(void) const;
00077 int64_t val_int(void) const;
00078 String *val_str(String*,String *) const;
00079 inline String *val_str(String *str) { return val_str(str, str); }
00080 type::Decimal *val_decimal(type::Decimal *) const;
00081 int cmp_max(const unsigned char *, const unsigned char *, uint32_t max_length);
00082 inline int cmp(const unsigned char *str) { return cmp(ptr,str); }
00083 int cmp(const unsigned char *a,const unsigned char *b)
00084 {
00085 return cmp_max(a, b, UINT32_MAX);
00086 }
00087 void sort_string(unsigned char *buff,uint32_t length);
00088 uint32_t get_key_image(unsigned char *buff,uint32_t length);
00089 uint32_t get_key_image(std::basic_string <unsigned char> &buff, uint32_t length);
00090 void set_key_image(const unsigned char *buff,uint32_t length);
00091 void sql_type(String &str) const;
00092 virtual unsigned char *pack(unsigned char *to,
00093 const unsigned char *from,
00094 uint32_t max_length,
00095 bool low_byte_first);
00096
00097 virtual const unsigned char *unpack(unsigned char* to,
00098 const unsigned char *from,
00099 uint32_t param_data,
00100 bool low_byte_first);
00101
00102 int cmp_binary(const unsigned char *a,const unsigned char *b, uint32_t max_length=UINT32_MAX);
00103 int key_cmp(const unsigned char *,const unsigned char*);
00104 int key_cmp(const unsigned char *str, uint32_t length);
00105 uint32_t max_packed_col_length(uint32_t max_length);
00106 uint32_t used_length();
00107 uint32_t size_of() const { return sizeof(*this); }
00108 enum_field_types real_type() const { return DRIZZLE_TYPE_VARCHAR; }
00109 bool has_charset(void) const
00110 { return charset() == &my_charset_bin ? false : true; }
00111 Field *new_field(memory::Root *root, Table *new_table, bool keep_type);
00112 Field *new_key_field(memory::Root *root, Table *new_table,
00113 unsigned char *new_ptr, unsigned char *new_null_ptr,
00114 uint32_t new_null_bit);
00115 };
00116
00117 }
00118
00119