big5_to_euc_tw | 11 | 10 | 36 | 4 | big5_to_euc_tw | t big5_to_mic | 11 | 10 | 36 | 7 | big5_to_mic | t big5_to_utf8 | 11 | 10 | 36 | 6 | big5_to_utf8 | t euc_cn_to_mic | 11 | 10 | 2 | 7 | euc_cn_to_mic | t euc_cn_to_utf8 | 11 | 10 ...
函数:convert_from(string bytea, src_encoding name) 说明:Convert string to the database encoding. The original encoding is specified by src_encoding. The string must be valid in this encoding. 转换字符串编码,自己要指定源编码,目标编码默认为数据库指定编码, 例子:convert_from('text_in_utf8', '...
PostgreSQL , conversion , pg_conversion , 拼音 , 编码转换 , convert , convert_to , convert_from 背景 国内的应用,在文本排序上基本都是按照拼音来进行排序的。 在不同的字符集中,汉字的编码可能不一样,比如UTF8和GBK,其中GBK是按拼音的顺序进行编码的,而UTF8则不是。 所以如果你的数据库使用了UTF8编码...
Full Convert migration in 4 easy steps 1. PostgreSQL We will choose PostgreSQL from the list of available source database engines. Connecting to Postgres is straightforward - we need to specify server name/IP, username, password and database name. 2. MySQL We will choose MySQL from the ...
PostgreSQL支持::运算符来进行显式类型转换。语法如下：:type 示例：SELECT'123':INTEGER 这也将把字符串'123'转换为整数。PostgreSQL中的类型通常具有相应的构造函数，可以使用这些构造函数进行类型转换。例如：SELECTINTEGER'123'这也将把字符串'123'转换为整数。PostgreSQL提供了一些内置的类型转换函数，例如TO_DATE、...
convert(string using conversion_name) text 使用指定的转换名字改变编码。 convert('PostgreSQL' using iso_8859_1_to_utf8) 'PostgreSQL' lower(string) text 把字串转化为小写 lower('TOM') tom octet_length(string) int 字串中的字节数 octet_length('jose') 4 overlay(string placing string from int ...
以默认参数为例,ConvertToXSegs(max_wal_size_mb, wal_segment_size)就是64。 CheckPointCompletionTarget就是checkpoint_completion_target参数的值,默认0.9。 所以CheckPointSegments = int(64/(1+0.9)) = 33,也就是当生成日志数超过33个时,需要做检查点。
Determines if the sourceValue parameter can be converted to the destinationType parameter C# Copy public override bool CanConvertTo (object sourceValue, Type destinationType); Parameters sourceValue Object the Object to convert from destinationType Type the Type to convert to...
Run the below statement to convert the given constant string to an integer: SELECTCAST('572'ASINTEGER); The output proves that the CAST operator takes a constant string and converts it into the desired data type, i.e., integer. Example #2: How to Use the CAST Operator to Table’s Co...
Summary: in this tutorial, you will learn how to use PostgreSQL CAST() function and operator to convert a value of one type to another. Introduction to PostgreSQL CAST() function and cast operator (::) There are many cases in which you want to convert a value of one type into another....