PHP MYSQL更新 - 替换整个单词，但不是它的一部分

Question

可以说字段名称为bla，值为123

当我这样做时：

mysqli_query($con, "UPDATE table SET bla = REPLACE (bla, 123, 777)");

123变为777并且它很好

但是当我这样做时：

mysqli_query($con, "UPDATE table SET bla = REPLACE (bla, 1, 777)");

我不希望123成为77723但是留下123

我该怎么做？

Answer 1

为什么在没有int main(int argc, char *argv[]) { char *hexstring = "08fc0021"; unsigned long hexnumber = 0u; unsigned short a = 0u; unsigned short b = 0u; /* Use sscanf() to convert the string to integer */ sscanf(hexstring, "%x", &hexnumber); /* Use bitwise and to filter out the two higher bytes * * and shift it 16 bits right */ a = ((hexnumber & 0xFFFF0000u) >> 16u); /* Use bitwise AND to filter out the two lower bytes */ b = (hexnumber & 0x0000FFFFu); printf("0x%X 0x%X\n",a,b); return 0; } 子句的情况下使用REPLACE？出了什么问题：

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