https://dev.mysql.com/doc/refman/5.5/en/integer-types.html BOOLEAN 这些类型是同义词 TINYINT(1)。值为零被视为false。非零值被认为是真的: 1.2、MySQL布尔数据类型 MySQL没有内置 BOOLEAN或BOOL数据类型。为了表示布尔值,MySQL使用最小的整数类型TINYINT(1)。换句话说,是 BOOLEAN和BOOL的同义词TINYINT(1)...
String columnName= columnsResultSet.getString("COLUMN_NAME");intsqlType = columnsResultSet.getInt("DATA_TYPE");//此处拿到mysql返回的字段类型String typeName= columnsResultSet.getString("TYPE_NAME");intsize = columnsResultSet.getInt("COLUMN_SIZE");booleannullable = 1 == columnsResultSet.getInt...
connection);using(MySqlDataReaderreader=command.ExecuteReader()){if(reader.Read()){boolmyBool=Convert.ToBoolean(reader.GetInt32(0));// 将数据库中的值转换为布尔值Console.WriteLine(myBool);}}}
TINYINT[(M)] [UNSIGNED] [ZEROFILL]:微整型,取值范围 -128 ~ 127,无符号情况下为 0 ~ 255。 BOOL, BOOLEAN:效果等同TINYINT(1),0 表示 FALSE,其他非 0 值处理成 TRUE。其中关键字TRUE,FALSE真实代表的是数字 1 和 0。 代码语言:javascript 复制 mysql>SELECTIF(0,'true','false');+---+|IF(0...
typeorm 0.1.0-alpha.28 is giving now error Data type "boolean" is not supported in "mysql" database. if using boolean datatype. Running with sqlite this works fine. This used to work with 0.0.11. I suppose I could fallback to tinyint as ...
Data node: This type of node stores cluster data. There are as many data nodes as there are replicas, times the number of fragments (see Section 18.1.2, “MySQL Cluster Nodes, Node Groups, Replicas, and Partitions”). For example, with two replicas, each having two fragments, you need ...
| mediumtext | YES | | NULL | | | d | decimal(10,0) | YES | | NULL | | +---+---+---+---+---+---+ 4 rows in set (0.01 sec)Suggested fix:Add a MySQL data type BOOLEAN as a special interpretation of a BIT(1) datatype. [15 Sep 2006 8:20] Valeriy Kravchuk Thank...
1、所有数值数据类型(除bit 和 boolean外)都可以有符号或无符号,有的符号数值列可以存储正或负的数值,无符号的数值列只能存储正数。默认情况为有符号,但如果你知道自己不需要存储数值,可以使用 UNSIGNED 关键字,这样做将允许存储两倍大小的值。 2、与串不一样,数值不应该括在引号内 ...
BOOLEAN Equal to BOOL SMALLINT(size) A small integer. Signed range is from -32768 to 32767. Unsigned range is from 0 to 65535. The size parameter specifies the maximum display width (which is 255) MEDIUMINT(size) A medium integer. Signed range is from -8388608 to 8388607. Unsigned range...
Bug #27959 Bool datatype is not returned as System.Boolean by MySqlDataAdapter Submitted: 19 Apr 2007 18:35Modified: 13 Nov 2007 11:43 Reporter: Simone Giordano Email Updates: Status: Closed Impact on me: None Category: Connector / NETSeverity: S4 (Feature request) Version: 5.0.6OS:...