程序包 ohos.data.rdb

类 RdbUtils

java.lang.Object

ohos.data.rdb.RdbUtils

public class RdbUtils
extends Object

Provides static utility methods related to the relational database (RDB).

从以下版本开始:

2

SystemCapability

SystemCapability.Data#DATA_APPDATAMGR

嵌套类概要

嵌套类

限定符和类型	类	说明
static class	RdbUtils.OperationType	Describes the database operation type.

方法概要

限定符和类型	方法	说明
static void	appendStringToSqlAndEscapeQuote(StringBuilder sqlbuilder, String escapeVar)	Appends an escapeVar to an sqlbuilder.
static String	escapeQuote(String sqlString)	Escapes the single quotation marks in a string.
static void	verifyPredicates(RdbStore rdbStore, RdbUtils.OperationType type, AbsRdbPredicates absRdbPredicates)	Verifies the specified instance object of AbsRdbPredicates.
static void	verifySql(RdbStore rdbStore, String sql)	Verifies the specified SQL statement.

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

方法详细资料

appendStringToSqlAndEscapeQuote

public static void appendStringToSqlAndEscapeQuote(StringBuilder sqlbuilder,
                                                   String escapeVar)

Appends an escapeVar to an sqlbuilder.

Single quotation marks contained in the escapeVar will be escaped. If escapeVar is null, it will not be appended, and sqlbuilder will be returned.

参数:

sqlbuilder - Indicates the sqlbuilder to which the sqlString will be appended.

escapeVar - Indicates the escapeVar to be appended.

escapeQuote

public static String escapeQuote(String sqlString)

Escapes the single quotation marks in a string.

If the input string is null, null will be returned. If the input string is empty, two single quotation marks will be returned.

参数:

sqlString - Indicates the string that contains the single quotation marks to be escaped.

返回:

Returns the string whose single quotation marks have been escaped.

verifySql

public static void verifySql(RdbStore rdbStore,
                             String sql)

Verifies the specified SQL statement.

参数:

rdbStore - Indicates the database on which to execute the SQL statement.

sql - Indicates the SQL statement to verify.

抛出:

RdbException - Throws this exception if the SQL statement is invalid.

IllegalArgumentException - Throws this exception if either parameter is null.

从以下版本开始:

3

verifyPredicates

public static void verifyPredicates(RdbStore rdbStore,
                                    RdbUtils.OperationType type,
                                    AbsRdbPredicates absRdbPredicates)

Verifies the specified instance object of AbsRdbPredicates.

This method applies to the update, delete, and count operations on the database.

参数:

rdbStore - Indicates the database for which to set the AbsRdbPredicates.

type - Indicates the operation type, as enumerated in OperationType.

absRdbPredicates - Indicates the instance object of AbsRdbPredicates to verify.

抛出:

RdbException - Throws this exception if the instance of AbsRdbPredicates is invalid for the specified operation type.

IllegalArgumentException - Throws this exception if any parameter is null.

从以下版本开始:

3