Java中如何获得数据库支持的字符串函数？
package org.nhooo.example.jdbc;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.DatabaseMetaData;
import java.sql.SQLException;
public class StringFunction {
private static final String URL = "jdbc:mysql://localhost/nhooo";
private static final String USERNAME = "root";
private static final String PASSWORD = "";
public static void main(String[] args) {
try (Connection connection =
DriverManager.getConnection(URL, USERNAME, PASSWORD)) {
DatabaseMetaData meta = connection.getMetaData();
//获取数据库支持的字符串函数
String[] functions = meta.getStringFunctions().split(",\\s*");
for (String function : functions) {
System.out.println("Function = " + function);
}
} catch (SQLException e) {
e.printStackTrace();
}
}
}这是MySQL数据库支持的字符串函数的结果：
Function = ASCII Function = BIN Function = BIT_LENGTH Function = CHAR Function = CHARACTER_LENGTH Function = CHAR_LENGTH Function = CONCAT Function = CONCAT_WS Function = CONV Function = ELT Function = EXPORT_SET Function = FIELD Function = FIND_IN_SET Function = HEX Function = INSERT Function = INSTR Function = LCASE Function = LEFT Function = LENGTH Function = LOAD_FILE Function = LOCATE Function = LOCATE Function = LOWER Function = LPAD Function = LTRIM Function = MAKE_SET Function = MATCH Function = MID Function = OCT Function = OCTET_LENGTH Function = ORD Function = POSITION Function = QUOTE Function = REPEAT Function = REPLACE Function = REVERSE Function = RIGHT Function = RPAD Function = RTRIM Function = SOUNDEX Function = SPACE Function = STRCMP Function = SUBSTRING Function = SUBSTRING Function = SUBSTRING Function = SUBSTRING Function = SUBSTRING_INDEX Function = TRIM Function = UCASE Function = UPPER
Maven依赖
<!-- https://search.maven.org/remotecontent?filepath=mysql/mysql-connector-java/8.0.17/mysql-connector-java-8.0.17.jar -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.17</version>
</dependency>