程序包 ohos.data.rdb

枚举 RdbStore.ConflictResolution

java.lang.Object

java.lang.Enum<RdbStore.ConflictResolution>

ohos.data.rdb.RdbStore.ConflictResolution

所有已实现的接口:

Serializable, Comparable<RdbStore.ConflictResolution>

封闭接口:

RdbStore

public static enum RdbStore.ConflictResolution
extends Enum<RdbStore.ConflictResolution>

Indicates the type of the method for resolving conflict.

从以下版本开始:

1

枚举常量概要

枚举常量

枚举常量	说明
ON_CONFLICT_ABORT	Aborts the current SQL statement with an SQLITE_CONSTRAINT error and discards any changes made by the current SQL statement when a constraint violation occurs.
ON_CONFLICT_FAIL	Aborts the current SQL statement with an SQLITE_CONSTRAINT error when a constraint violation occurs.
ON_CONFLICT_IGNORE	Skips the one row that encounters a constraint violation and continues processing subsequent rows of the SQL statement.
ON_CONFLICT_NONE	Performs no operation when a conflict occurs.
ON_CONFLICT_REPLACE	Deletes pre-existing rows that encounter a UNIQUE or PRIMARY KEY constraint violation prior to inserting or updating of the current row and continues command execution.
ON_CONFLICT_ROLLBACK	Aborts the current SQL statement with an SQLITE_CONSTRAINT error and rolls back the current transaction when a constraint violation occurs.

方法概要

限定符和类型	方法	说明
int	getValue()	Get conflict type number from ConflictResolution.
static RdbStore.ConflictResolution	valueOf(String name)	返回带有指定名称的该类型的枚举常量。 字符串必须与用于声明该类型的枚举常量的 标识符完全匹配。(不允许有多余 的空格字符。)
static RdbStore.ConflictResolution[]	values()	按照声明该枚举类型的常量的顺序, 返回 包含这些常量的数组。该方法可用于迭代 常量, 如下所示: for (RdbStore.ConflictResolution c : RdbStore.ConflictResolution.values()) System.out.println(c);

从类继承的方法 java.lang.Enum

clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

从类继承的方法 java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

枚举常量详细资料

ON_CONFLICT_NONE

public static final RdbStore.ConflictResolution ON_CONFLICT_NONE

Performs no operation when a conflict occurs.

ON_CONFLICT_ROLLBACK

public static final RdbStore.ConflictResolution ON_CONFLICT_ROLLBACK

Aborts the current SQL statement with an SQLITE_CONSTRAINT error and rolls back the current transaction when a constraint violation occurs.

ON_CONFLICT_ABORT

public static final RdbStore.ConflictResolution ON_CONFLICT_ABORT

Aborts the current SQL statement with an SQLITE_CONSTRAINT error and discards any changes made by the current SQL statement when a constraint violation occurs. The changes made by the previous SQL statements within the same transaction are retained and the transaction remains active. This is the default behavior as specified by the SQL standard.

ON_CONFLICT_FAIL

public static final RdbStore.ConflictResolution ON_CONFLICT_FAIL

Aborts the current SQL statement with an SQLITE_CONSTRAINT error when a constraint violation occurs. The FAIL resolution algorithm does not discard prior changes of the SQL statement that has failed or end the transaction. For example, if an UPDATE statement encounters a constraint violation on the 100th row that it attempts to update, then the changes made to the first 99 rows are retained but changes to rows 100 and beyond never occur.

ON_CONFLICT_IGNORE

public static final RdbStore.ConflictResolution ON_CONFLICT_IGNORE

Skips the one row that encounters a constraint violation and continues processing subsequent rows of the SQL statement. The rows before and after the row that encounters the constraint violation are inserted or updated normally. No error is returned when the IGNORE conflict resolution algorithm is used.

ON_CONFLICT_REPLACE

public static final RdbStore.ConflictResolution ON_CONFLICT_REPLACE

Deletes pre-existing rows that encounter a UNIQUE or PRIMARY KEY constraint violation prior to inserting or updating of the current row and continues command execution.

方法详细资料

values

public static RdbStore.ConflictResolution[] values()

按照声明该枚举类型的常量的顺序, 返回 包含这些常量的数组。该方法可用于迭代 常量, 如下所示:

for (RdbStore.ConflictResolution c : RdbStore.ConflictResolution.values())
    System.out.println(c);

返回:

按照声明该枚举类型的常量的顺序返回的包含这些常量的数组

valueOf

public static RdbStore.ConflictResolution valueOf(String name)

返回带有指定名称的该类型的枚举常量。 字符串必须与用于声明该类型的枚举常量的 标识符完全匹配。(不允许有多余 的空格字符。)

参数:

name - 要返回的枚举常量的名称。

返回:

返回带有指定名称的枚举常量

抛出:

IllegalArgumentException - 如果该枚举类型没有带有指定名称的常量

NullPointerException - 如果参数为空值

getValue

public int getValue()

Get conflict type number from ConflictResolution.

返回:

the conflict type number.