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Database Abstraction Layer for PHP

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v5:dictionary:column_attributes [2016/02/29 00:42] – [Dictionary Column Attributes] mnewnhamv5:dictionary:column_attributes [2016/04/03 01:29] – [CONSTRAINT] mnewnham
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 </WRAP> </WRAP>
 ==== AUTO or AUTOINCREMENT ==== ==== AUTO or AUTOINCREMENT ====
-Creates the column as auto-increment. Support for this varies from one database to another. Some databases designate a field with an auto-increment flag as the primary key.+Creates the column as auto-increment. Support for this varies from one database to another. Some databases designate a field with an auto-increment flag as the primary key, and most databases only allow a single column in a table to be designated as auto-increment.
  
 ----------------------- -----------------------
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 </WRAP> </WRAP>
 ==== CONSTRAINT ==== ==== CONSTRAINT ====
 +Adds a constraint to column. The syntax for the constraint must be defined as required by the database.
 -------------------------- --------------------------
 <WRAP right box 150px> <WRAP right box 150px>
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 </WRAP> </WRAP>
 ==== DEF or DEFAULT ==== ==== DEF or DEFAULT ====
-** DEF ** indicates a default value for a column when a row is created. Some databases also require a field with a default value to be designated as NOT NULL, so that is automatically added to the column string+** DEF ** indicates a default value for a column when a row is created. Some databases also require a field with a default value to be designated as NOT NULL, so that is automatically added to the column string. For dynamically created dates or timestsamps, see the options below.
 --------------------------- ---------------------------
 +<WRAP right box 150px>
 +** Usage: Column **
 +</WRAP>
 ==== DEFDATE ==== ==== DEFDATE ====
 +Indicates if the column (metaType **D** or **T**) should be defaulted to current date when a column is created. This differs from the **DEFTIMESTAMP** option below in that it only contains the date portion of a timestamp.
 -------------------------- --------------------------
 +<WRAP right box 150px>
 +** Usage: Column **
 +</WRAP>
 ==== DEFTIMESTAMP ==== ==== DEFTIMESTAMP ====
 +Indicates if the column (metaType **D** or **T**) should be defaulted to current timestamp when a column is created.
 -------------------------- --------------------------
 <WRAP right box 150px> <WRAP right box 150px>
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 ----------------------------------- -----------------------------------
 +<WRAP right box 150px>
 +**Usage: Column**
 +</WRAP>
 ==== INDEX ==== ==== INDEX ====
 +Creates a single column index using the same name as the column, with 'idx_' prepended to the name, e.g. a column of name ''column1'' will create an index of name ''idx_column1''.
 ------------------------------- -------------------------------
-==== KEY ==== 
  
---------------------------------+<WRAP right box 150px> 
 +** Usage: Any ** 
 +</WRAP>
 ==== NOQUOTE ==== ==== NOQUOTE ====
 +Prevents ADOdb from applying the normal quoting rules to tables, columns and indexes. For example, a column name that contains a special character such as  //**some-column**// will be automatically quoted to **//'some-column'//**. This tag prevents the behavior.
 -------------------------------- --------------------------------
 <WRAP right box 150px> <WRAP right box 150px>
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 </WRAP> </WRAP>
 ==== NOTNULL ==== ==== NOTNULL ====
 +Flags the column so that a NULL value cannot be inserted. For columns that are Auto-Increment or a Primary Key, this option is often implied.
 ---------------------------- ----------------------------
 <WRAP right box 150px> <WRAP right box 150px>
-**Usage: Index**+**Usage: Column**
 </WRAP> </WRAP>
-==== PRIMARY ====+==== PRIMARY or KEY ==== 
 +Indicates if the column is part of the [[wp>Unique Key|Primary Key]] of the table.
 --------------------------- ---------------------------
 <WRAP right box 150px> <WRAP right box 150px>
-** Usage: Index **+** Usage: Column**
 </WRAP> </WRAP>
 +
 ==== UNIQUE ==== ==== UNIQUE ====
 ** UNIQUE ** is an option against a key and indicates that duplicate values across all columns in the key are not allowed. ** UNIQUE ** is an option against a key and indicates that duplicate values across all columns in the key are not allowed.
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 </WRAP> </WRAP>
 ==== UNSIGNED ==== ==== UNSIGNED ====
 +Creates an unsigned integer.
v5/dictionary/column_attributes.txt · Last modified: 2022/09/02 04:11 by mnewnham