How to implement an Escaper to prevent SQL Injection on Postgres? - postgresql

Question

In my Spring Boot project I'm trying to implement a kind of virtual proxy able to intercept REST API coming from an external microservice and thus activate security filters to manage the following vulnerabilities: XSS, CSRF, SQL-INJECTION.
I was able to implement the filters concerning the first two vulnerabilities.
I am continuing on the SQL-Injection and for now I have implemented a class that behaves like Escaper (which I had already found here on stackoverflow) but I don't know if it's okay or if there is something better.
public class SQLInjectionEscaper {
private final DataSource dataSource = null;
public static String escapeString(String value) {
StringBuilder sBuilder = new StringBuilder(value.length() * 11 / 10);
int stringLength = value.length();
for (int i = 0; i < stringLength; ++i) {
char c = value.charAt(i);
switch (c) {
case 0: /* Must be escaped for 'mysql' */
sBuilder.append('\\');
sBuilder.append('0');
break;
case '\n': /* Must be escaped for logs */
sBuilder.append('\\');
sBuilder.append('n');
break;
case '\r':
sBuilder.append('\\');
sBuilder.append('r');
break;
case '\\':
sBuilder.append('\\');
sBuilder.append('\\');
break;
case '\'':
sBuilder.append('\\');
sBuilder.append('\'');
break;
case '"': /* Better safe than sorry */
// if (escapeDoubleQuotes) {
// sBuilder.append('\\');
// }
sBuilder.append('"');
break;
case '\032': /* This gives problems on Win32 */
sBuilder.append('\\');
sBuilder.append('Z');
break;
case '\u00a5':
case '\u20a9':
// escape characters interpreted as backslash by mysql
// fall through
default:
sBuilder.append(c);
}
}
return sBuilder.toString();
}
}
In particular I would like to create an escaper similar to this but better and above all suitable for postgres db.
Can you help me?