Revert "db: increase db module level in vlib "

This reverts commit cd6d175180.

vlib/mysql/enums.v

@@ -0,0 +1,72 @@
+module mysql
+
+pub enum FieldType {
+	type_decimal
+	type_tiny
+	type_short
+	type_long
+	type_float
+	type_double
+	type_null
+	type_timestamp
+	type_longlong
+	type_int24
+	type_date
+	type_time
+	type_datetime
+	type_year
+	type_newdate
+	type_varchar
+	type_bit
+	type_timestamp2
+	type_datetime2
+	type_time2
+	type_json        = 245
+	type_newdecimal
+	type_enum
+	type_set
+	type_tiny_blob
+	type_medium_blob
+	type_long_blob
+	type_blob
+	type_var_string
+	type_string
+	type_geometry
+}
+
+pub fn (f FieldType) str() string {
+	return match f {
+		0    { 'decimal'     }
+		1    { 'tiny'        }
+		2    { 'short'       }
+		3    { 'long'        }
+		4    { 'float'       }
+		5    { 'double'      }
+		6    { 'null'        }
+		7    { 'timestamp'   }
+		8    { 'longlong'    }
+		9    { 'int24'       }
+		10   { 'date'        }
+		11   { 'time'        }
+		12   { 'datetime'    }
+		13   { 'year'        }
+		14   { 'newdate'     }
+		15   { 'varchar'     }
+		16   { 'bit'         }
+		17   { 'timestamp2'  }
+		18   { 'datetime2'   }
+		19   { 'time2'       }
+		245  { 'json'        }
+		246  { 'newdecimal'  }
+		247  { 'enum'        }
+		248  { 'set'         }
+		249  { 'tiny_blob'   }
+		250  { 'medium_blob' }
+		251  { 'long_blob'   }
+		252  { 'blob'        }
+		253  { 'var_string'  }
+		254  { 'string'      }
+		255  { 'geometry'    }
+		else { 'unknown'     }
+	}
+}